13B Renesis Rebuild

Complete guide to rebuilding the Renesis 13B-MSP rotary engine (RX-8). This document covers pre-rebuild diagnostics, required tooling, disassembly, inspection, reassembly, and first start-up procedures.

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Before You Begin

This Is Not a Beginner Project

A 13B Renesis rebuild is more demanding than a conventional piston engine rebuild:

• The tolerances of the seals (apex seals, side seals, corner seals) are critical and measured to the hundredth of a millimeter
• The order and torque of the eccentric shaft (e-shaft) bolts must be followed to the letter
• A reassembly error can destroy the engine in a matter of minutes
• Average budget: $3,000 - $6,000 USD in parts (excluding labor) (Mazmart, Atkins Rotary)

:::warning Prerequisites

• Have the Mazda RX-8 Workshop Manual (available on RotaryHeads or Foxed.ca)
• A clean, well-lit workspace
• An air compressor
• Means to lift/support the engine
• Plenty of ZIP bags and markers to organize parts :::

Sources and References

Source	Description
Mazda RX-8 Workshop Manual	Official Mazda workshop manual, sections 01-14
Renesis Training Material PDF (RX8Club)	Mazda training document on the Renesis
StarMazda Technical Document	Star Mazda technical document
Rotary Engine Illustrated	Animated rotary engine diagrams
Mazmart	OEM parts and rebuild kits
Atkins Rotary	Specialized rotary parts
BHR Ignition	Ignition, performance components

Reference Videos

Video	Description	Link
Engineering Explained - Rotary Engine	Detailed anatomy and operation	YouTube
Rotary Engine Assembly Time-Lapse	Accelerated 13B assembly	YouTube
Rebuild 13B Renesis - Series 1	Full rebuild with explanations	YouTube

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1. Confirming the Need for a Rebuild

Symptoms Indicating a Rebuild Is Necessary

Before starting, confirm that the engine actually needs a full rebuild:

Symptom	Probable Cause	Rebuild Necessary?
Low compression (rotary test)	Worn apex seals / side seals	Yes
Hard starting when hot	Compression loss	Probably
Unstable idle / stalling when hot	Insufficient compression	Probably
Excessive oil consumption (> 1qt/500 miles)	Failed oil control ring	Possible
Continuous blue smoke	Internal seal (coolant seal or oil ring)	Probably
Oil/coolant contamination	Failed coolant seal	Yes

The Rotary Compression Test

This is THE definitive test. A standard piston compression test DOES NOT WORK on a rotary engine.

Required equipment: Mazda rotary compression tester (or equivalent AST / Rotary Compression Tester)

Procedure:

1. Engine at operating temperature
2. Disconnect the injectors and coils
3. Connect the tester to the leading spark plug hole (lower)
4. Crank the starter for ~5 seconds
5. Record the 3 values per rotor + cranking RPM
6. Repeat for the second rotor

Interpretation (normalized to 250 RPM, sea level):

Score (kg/cm²)	Rating
8.5+	Exceptional
8.0-8.4	Very good
7.5-7.9	Acceptable (new engine after break-in)
7.0-7.4	Starting to wear, plan a rebuild
6.5-6.9	Official fail - rebuild necessary
< 6.5	Urgent rebuild

Normalization calculator: Foxed.ca Rotary Compression Calculator

tip

Any rotor face below 6.9 = fail. A single low score is enough to condemn the engine.

(Foxed.ca)

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2. Engine Identification

Series 1 vs Series 2

Before ordering parts, precisely identify the engine:

Characteristic	Series 1 (2004-2008)	Series 2 (2009-2012)
Oil injectors	4 (2 per rotor)	6 (3 per rotor)
Oil pump	Lower pressure	Higher pressure (RX-7 level)
Oil pump (ref)	Different reference	S2-specific reference
Compression ratio	10.0:1	10.0:1
E-shaft bolts	Same specification	Same specification
Apex seals	Same design	Same design
Electronics (ECU)	Different	Different

:::danger Compatibility A Series 1 and Series 2 engine are NOT directly interchangeable without modifying the entire electronics. Verify compatibility before ordering. :::

4-port vs 6-port

Version	Transmission	Power
4-port	4-auto, 5-manual (Europe)	~192 hp
6-port	6-manual, 6-auto (2006+)	~232 hp

Visual identification: the 6-port has 2 additional intake ports on the upper intake manifold (UIM).

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3. Required Tooling

Rotary-Specific Tooling

Tool	Reference / Source	Purchase Link	Purpose
Torque wrench (precise)	1/2" drive, 20-220 Nm	AEROFORCE 1/2" 20-220 Nm / Wera Click-Torque C 80-400 Nm	Critical torque specs
Feeler gauge	Metric set 0.04-0.88mm, 32 blades	Feeler Gauge 32 stainless steel blades	Seal clearance measurement
Outside micrometer	0-25mm, 0.001mm precision	Beslands Digital Micrometer 0-25mm	Housing and rotor measurement
Precision caliper	150mm, 0.01mm	Amazon.fr	General measurements
Rotary engine stand adapter	For 60mm stand	maXpeedingrods RX-8 Stand Adapter	Mounting engine on stand
Rotary compression tester	See Workshop Manual for reference	Mazda dealer tool — order by reference	Pre/post rebuild diagnostics
Long Allen key set	Metric set, extra-long	Amazon.fr	Internal engine disassembly
Blind hole bearing puller	LainKeen 12pcs 8-32mm	LainKeen Blind Hole Bearing Puller	E-shaft bearings (replaces SST 49 1285 071)
Rubber mallet	50-70mm	Amazon.fr	Assembly without damage
Flywheel holder	Bzcovac universal	Bzcovac Flywheel Turner	Holding flywheel during tightening (replaces SST 49 1881 055A / 49 F011 101)
Seal pick set	NEIKO 20758A, 4 pieces	NEIKO O-Ring Pick Set	O-ring extraction without damage (replaces SST 49 0813 225A)
Dial indicator	0.01mm, with magnetic base	Amazon.fr	E-shaft endplay measurement

General Tooling

Tool	Purchase Link
Complete socket set (8-24mm)	Amazon.fr
Allen + Torx set	Amazon.fr
Circlip pliers (internal + external)	Amazon.fr
Air compressor + blow gun	Amazon.fr
Paint pen marker (white)	Amazon.fr
ZIP bags + labels	Amazon.fr
Brake cleaner	Amazon.fr
Simple Green solvent	Amazon.fr
RTV silicone (high temp)	Amazon.fr
Engine oil (for seal lubrication)	5W-20 or 5W-30 non-synthetic

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4. Rebuild Kit - Required Parts

Full Gasket & Seal Kit

:::info Recommended Suppliers

• Mazmart: Complete OEM kit, best value for money
• Atkins Rotary: Kits with performance options
• Mazda Dealer: Individual OEM parts (more expensive) :::

Internal Seals

Part	Quantity	Mandatory Replacement?
Apex seals	6 (3 per rotor)	Yes - always
Apex seal springs	6	Yes - always
Side seals	6 (3 per rotor)	Yes - always
Side seal springs	6	Yes - always
Corner seals	6 (3 per rotor)	Yes - always
Corner seal springs	6	Yes - always
Oil control rings	4 (2 per rotor)	Recommended
Oil control ring expander	4	Recommended

:::tip Budget Rebuild Approach You don't always need to replace everything. Inspect parts carefully — keep what's still within spec. A budget rebuild may only need new apex seals and springs (~$900 in parts). Inspect rotors, housings, and bearings before ordering a full kit. :::

:::danger Corner Seal Metal Plug Orientation The corner seal has a metal plug that MUST face inward (sandwiched between rotor and outside). If installed backwards, the plug falls out and destroys the engine through the ports. :::

Gaskets

Part	Quantity
Side housing gasket	2
Rotor housing O-ring	2
Center iron gasket	1
Oil pump gasket	1
Water pump gasket	1
Oil pan gasket	1
Miscellaneous gaskets (thermostat, etc.)	Per manual

Other Maintenance Parts

Part	Note
New seal washers on tension bolts	Mandatory — seal washers must be replaced (rubber projection facing housing side). Tension bolts may be reused if undamaged
E-shaft bearings	Inspect, replace if play detected
Stationary gears	Inspect teeth, replace if damaged
Coolant seals (rubber rings)	Always replace
Oil/water pump O-rings	Always replace
Ignition coils (4)	Replace during rebuild
Spark plugs (4)	NGK RE9B-T + RE7C-L
Spark plug wires (4)	Replace
Thermostat	Consider 172°F upgrade (Mazmart)
FL-22 coolant	Mazda recommended

Estimated Budget (parts only)

Scenario	Estimated Cost (USD)
Complete OEM gasket and seal kit	$1,200 - $1,800
Bearings + gears if necessary	+$400 - $800
Coils + spark plugs + wires	+$300 - $580
Fluids (oil, coolant, filters)	+$150 - $200
Consumables (solvent, RTV, etc.)	+$50 - $100
Total parts	$2,100 - $3,480
Professional labor (if outsourced)	+$1,500 - $3,000
Total including labor	$3,600 - $6,480

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5. Engine Removal

Preparation

1. Photograph everything - wiring, hoses, connections
2. Label every connector with tape and a marker
3. Drain the engine oil (while still warm)
4. Drain the coolant
5. Disconnect the battery

Removal Steps (summary)

:::caution Refer to Workshop Manual Section 01-14 for complete details and torque specs. :::

1. Disconnect the battery and remove the hood
2. Remove the upper intake manifold (UIM) and lower intake manifold (LIM)
3. Disconnect the engine wiring harness (label each connector)
4. Disconnect coolant, fuel, and vacuum hoses
5. Remove the alternator, power steering pump
6. Remove the starter
7. Disconnect the shifter linkage
8. Remove the exhaust line (header + midpipe)
9. Remove the driveshaft
10. Remove the engine mounts (3 points)
11. Lift the engine out of the bay with a hoist

tip

Putting the vehicle on a lift or jack stands is strongly recommended. The engine is removed from the top with a hoist.

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6. Engine Disassembly

Engine Exploded View

    ┌─────────────────────────────────────────────────────┐
    │                  FRONT SIDE HOUSING                  │
    │              (Front Side Housing / Front Iron)       │
    ├─────────────────────────────────────────────────────┤
    │                                                     │
    │   ┌───────────────────────────────────────────┐     │
    │   │         FRONT ROTOR HOUSING                │     │
    │   │          (Front Rotor Housing)             │     │
    │   │                                            │     │
    │   │        ╭───────────────╮                   │     │
    │   │        │    ROTOR 1    │                   │     │
    │   │        │  (Triangle)   │                   │     │
    │   │        │               │                   │     │
    │   │        │  ⚙ Apex seals │                   │     │
    │   │        │  ⚙ Side seals │                   │     │
    │   │        │  ⚙ Corner seals                   │     │
    │   │        ╰───────────────╯                   │     │
    │   └───────────────────────────────────────────┘     │
    │                                                     │
    ├─────────────────────────────────────────────────────┤
    │                CENTER IRON                           │
    │              (Center Iron / Center Housing)          │
    │         ⟵ Oil injectors (OMP) here                  │
    ├─────────────────────────────────────────────────────┤
    │                                                     │
    │   ┌───────────────────────────────────────────┐     │
    │   │         REAR ROTOR HOUSING                 │     │
    │   │          (Rear Rotor Housing)              │     │
    │   │                                            │     │
    │   │        ╭───────────────╮                   │     │
    │   │        │    ROTOR 2    │                   │     │
    │   │        │  (Triangle)   │                   │     │
    │   │        │               │                   │     │
    │   │        │  ⚙ Apex seals │                   │     │
    │   │        │  ⚙ Side seals │                   │     │
    │   │        │  ⚙ Corner seals                   │     │
    │   │        ╰───────────────╯                   │     │
    │   └───────────────────────────────────────────┘     │
    │                                                     │
    ├─────────────────────────────────────────────────────┤
    │                 REAR SIDE HOUSING                    │
    │              (Rear Side Housing / Rear Iron)         │
    │                                                     │
    │         ⟵ Flywheel here                             │
    └─────────────────────────────────────────────────────┘

    ═══════════ ECCENTRIC SHAFT (E-SHAFT) ═══════════
         ⟵ Passes through the entire assembly ⟶

Disassembly Procedure

Phase 1: External Strip-Down

1. Remove the ignition coils and spark plugs
2. Remove the lower intake manifold (LIM)
   • Note: Mark the position of the SSV (Secondary Shutter Valve) and VDI (Variable Dynamic Intake) intake ports
3. Remove the exhaust manifold (header)
4. Remove the water pump and thermostat
5. Remove the oil pump (watch out for OMP lines)
6. Remove the oil pan
7. Remove the front cover
8. Remove the eccentric shaft gear (e-shaft gear)
9. Remove the flywheel - use a flywheel holder

Phase 2: Core Engine Disassembly

:::danger Critical Step Removing the housing plates is the most delicate step. Every part must be marked and stored with care. :::

1. Remove the eccentric shaft bolts (e-shaft bolts)

   • 2 bolts at the front, 2 bolts at the rear
   • Loosen in a star pattern, progressively
   • These bolts will be replaced (single use)

2. Remove the side housing bolts (through-bolts)

   • There are typically 8 to 10 through-bolts
   • Loosen in a spiral from outside to inside
   • Count and mark each bolt

3. Separate the rear side plate (rear iron)

   • Use dowel pins for alignment
   • Tap gently with a rubber mallet
   • Watch out for coolant seals - they will come out

4. Remove the rear rotor (rotor 2)

   • Carefully lift the rotor out of the housing
   • Record the position of the apex seals (mark each rotor face: 1, 2, 3)
   • Remove the apex seals, side seals, corner seals from the rotor
   • Store in labeled bags: "Rotor 2 - Face 1/2/3"

5. Separate the rear rotor housing

6. Separate the center plate (center iron)

   • Watch out for oil injectors (OMP)
   • Remove the OMP lines with care

7. Remove the front rotor (rotor 1)

   • Same procedure as the rear rotor
   • Mark and store the same way

8. Separate the front rotor housing

9. Remove the front side plate (front iron)

10. Remove the eccentric shaft (e-shaft)

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7. Inspection and Measurements

Rotor Housing Inspection

    ╭─────────────────────────────────╮
    │    ROTOR HOUSING (profile)       │
    │                                  │
    │   ⟵ Epitrochoid (internal profile)│
    │                                  │
    │   Zones to inspect:              │
    │                                  │
    │   [1] Apex seal sealing surface  │
    │       (chrome lining)            │
    │                                  │
    │   [2] Intake ports               │
    │       (on side housings)         │
    │                                  │
    │   [3] Oil injector holes         │
    │                                  │
    │   [4] Coolant seal holes         │
    ╰─────────────────────────────────╯

Element to Inspect	Acceptance Criteria	Action If Defective
Chrome lining (trochoid)	No deep scratches, no bare spots	Replace housing
Housing scratches	Light scratches tolerated (< 0.01mm)	Polish if possible, otherwise replace
Warping	Measure on surface plate, flatness < 0.05mm	Replace if > 0.05mm
Intake/exhaust ports	No cracks, no excessive carbon	Clean, replace if cracked
Coolant seal holes	No corrosion, no cracks	Replace if damaged

:::tip Housing Assessment Run your finger over the trochoid surface — grooves you can feel mean compression loss. Always borescope an engine before purchase or teardown to assess housing condition. For the Renesis, housing resurfacing is often more expensive than sourcing replacement housings (unlike older RX-7 housings where resurfacing may be worthwhile). :::

Rotor Inspection

           ╱╲
          ╱  ╲         Face 1
         ╱    ╲        (Apex Seal 1)
        ╱  ⚙   ╲
       ╱ Apex    ╲
      ╱  Seal 1   ╲
     ╱              ╲
    ╱                ╲─────────────────╲
    │                 │  Corner │       │
    │                 │  Seal   │       │
    │    Side Seal    │    ⚙    │ Side  │
    │      ⚙         │         │ Seal  │
    │                 │  Corner │  ⚙    │
    │    Face 3       │  Seal   │       │
    │                 │    ⚙    │ Face 2│
    ╲                ╱─────────────────╱
     ╲              ╱     (Apex Seal 2)
      ╲  Apex      ╱
       ╲ Seal 3  ╱
        ╲  ⚙   ╱
         ╲    ╱
          ╲  ╱     Face 3
           ╲╱      (Apex Seal 3)

Element to Inspect	Acceptance Criteria	Action
Apex seal grooves	Width within tolerance (see manual)	Replace rotor if out of tolerance
Side seal grooves	Acceptable side clearance	Replace if excessive wear
Corner seal grooves	No cracks	Replace rotor if cracked
Rotor faces	No scratches deeper than > 0.02mm	Light polish or replace
Oil ring grooves	Not clogged, no excessive carbon	Clean
Internal bearing (bearing)	No play, smooth surface	Replace bearing

Eccentric Shaft (E-Shaft) Inspection

Element	Criteria
Journals	No scratches, measurements within tolerance
Bearings	No excessive axial or radial play
Threads	Intact, no crossed threads
Gears	Teeth intact, no wear

Critical Measurements

All measurements must be compared to the Mazda Workshop Manual specifications.

Measurement	Tool	Tolerance
Apex seal groove clearance	Feeler gauge	0.042-0.077mm standard, 0.15mm maximum (Workshop Manual)
Side seal axial clearance	Feeler gauge	~0.006" (Renesis likes slightly looser than RX-7)
Housing width (rotor housing)	Micrometer	See manual
E-shaft journal diameter	Micrometer	See manual
Plate flatness	Surface plate + gauge	< 0.05mm
E-shaft bearing play	Dial indicator	See manual
End play	Magnetic base + dial indicator	< 0.030" — adjust with letter spacer
Rotation torque after assembly	Torque wrench on e-shaft	Must be < 20 ft-lbs — if more, something is wrong

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8. Cleaning

Procedure

1. Soak the plates and housings in an industrial solvent (Simple Green, brake cleaner)
2. Clean all passages (oil, coolant, intake) with compressed air
3. Scrape carbon from the rotors with a plastic blade (NEVER metal)
4. Clean the seal grooves with solvent + compressed air
5. Rinse with water then dry with compressed air
6. Oil immediately all machined surfaces to prevent corrosion

caution

NEVER use a high-pressure cleaner directly on the sealing surfaces (trochoid). Never use sandpaper on the chrome lining.

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9. Reassembly

Reassembly Order (reverse of disassembly)

Phase 1: Rotor Preparation

1. Install the oil control rings on each rotor

   • Check the expander orientation
   • Verify that the ends are properly spaced
   • Oil control ring springs are directional — if installed backwards, they will spin and destroy the O-rings quickly

2. Install the corner seals in each corner of the rotor

   • Lubricate with clean engine oil
   • Check the axial clearance with a feeler gauge

3. Install the side seals along each face of the rotor

   • Insert the spring first
   • Slide the side seal into the groove
   • Check the clearance
   • Side seals are clearance-fitted to their specific slots — mark them and return them to the same position

4. Install the apex seals on each tip of the rotor

   • Place the apex seal spring in the groove
   • Insert the apex seal from the top of the groove
   • Do NOT force - it should slide freely

:::tip Seal Assembly Tricks

• Superglue trick: Lightly superglue the small corner piece to the main apex seal body for easier assembly. The glue breaks off during first running.
• Old apex seal as tool: Use an old apex seal to hold and line up corner seals during rotor assembly — prevents them from falling out of position.
• Grease/Vaseline: Use grease or Vaseline on corner seals and side seals to hold them in place when flipping the rotor. Vaseline burns off harmlessly on first start.
• Keep seals indexed: Mark every seal's position using the barcode on the gear side of the rotor as reference point (apex seal #1, then clockwise 1-2-3). :::

:::danger Sharp Oil Control Rings Oil control rings are razor sharp. Do not slide your fingers across them — they will cut you instantly. :::

    Detail of an apex seal in place:

    ═════════════════════════  Housing surface (chrome)
           │
        ╭──╮  ← Apex seal (inserted in rotor groove)
        │  │
        │⚙│  ← Spring (apex seal spring)
        │  │
    ────╰──╯────  Rotor face (groove)

Phase 2: Core Engine Assembly

:::danger Critical Torque Eccentric shaft assembly is the most critical step. Incorrect tightening will destroy the engine. :::

1. Place the front side plate (front iron) on the stand

   • Position the centering dowel pins
   • Install new coolant seals (coat with grease to hold them in place)

2. Place the front rotor housing

   • Align on the dowel pins
   • Check orientation ("F" marking or arrow)
   • Exhaust ports face left on the Renesis

3. Install the front rotor (rotor 1)

   • Generously lubricate the seals with clean engine oil
   • Position the rotor on the e-shaft eccentric
   • Verify that the apex seals are properly seated and compressed
   • Front rotor has "F" in serial number, gear side faces the front iron

4. Install the eccentric shaft (e-shaft)

   • Lubricate the bearings with clean engine oil
   • Insert into the front housing + rotor
   • Correct direction only — if e-shaft won't drop in, rotor timing is wrong

5. Place the center plate (center iron)

   • Install new coolant seals
   • Install O-rings on the OMP oil lines
   • Align on the dowel pins
   • Two-person job: one lifts the e-shaft while the other slides the plate over

6. Place the rear rotor housing

   • Align on the dowel pins

7. Install the rear rotor (rotor 2)

   • Same procedure as the front rotor
   • Generously lubricate
   • Rear rotor has "R" serial number, gear side faces outward (opposite to front)

8. Place the rear side plate (rear iron)

   • Install all new coolant seals and O-rings
   • Align on the dowel pins
   • Install the oil pressure regulator before stacking (easier now than later)

Phase 3: Eccentric Shaft Tightening

This is the most critical step of the entire rebuild.

:::danger E-SHAFT TIGHTENING PROCEDURE You MUST follow the Workshop Manual for torque specs. The typical procedure is:

1. Install new bolts (never reuse the old ones)
2. Tighten in 3 progressive passes in a star pattern:
   • Pass 1: Intermediate torque (see manual)
   • Pass 2: Higher torque (see manual)
   • Pass 3: Fixed additional angle (see manual)
3. Verify free rotation of the e-shaft after each pass
   • If binding or abnormal resistance: STOP - disassemble and check

The exact values are in Workshop Manual Section 01-11. :::

:::tip Tension Bolt Torque (Community) Community builders commonly use a progressive 10 → 20 → 30 ft-lbs sequence (Factory spec: 31.4-39.2 Nm / 23.2-28.9 ft-lbs in 2-3 passes per the Workshop Manual; the 10/20/30 sequence is community practice from older 13B engines). Always rotate the engine between torque sequences to let apex seal end pieces break free and seat properly. If you torque everything in one spot without rotating, the engine will be extremely stiff to turn. :::

:::tip Coolant Seal Installation

• Inner seal (orange): The glued break joint MUST be positioned at the intake port — that's the coldest section, least likely to come apart
• Outer seal (black/white): White edge is vertical (visible face), black edge is flat. Very easy to twist — keep checking
• Use Permatex High-Tac (or Vaseline) in the grooves to hold seals in place during assembly. Syringe application keeps it clean
• Apply RTV on oil-pan mating edges of each iron :::

Phase 4: Through-Bolt Tightening

1. Install all through-bolts
2. Tighten in a spiral from center to outside
3. Torque per the Workshop Manual
4. Verify free rotation of the e-shaft again

Phase 5: External Component Reinstallation

1. Install the e-shaft gear (new or inspected)
2. Install the oil pump (new gaskets)
   • Series 2 only: verify the pump reference (higher pressure)
3. Install the water pump (new gasket)
4. Install the thermostat (consider the 172°F Mazmart)
5. Install the OMP lines (new O-rings, cleaned lines)
6. Install the oil pan (RTV per manual)
7. Install the front cover (new gasket)
8. Install the flywheel (new bolts, exact torque)
9. Install the intake and exhaust manifolds (new gaskets)

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10. Priming

Before First Start

:::danger NEVER start the engine without priming it first. :::

1. Remove all 4 ignition coils (to prevent spark)
2. Remove the fuel pump and injector fuses (to prevent injection)
3. Crank the engine with the starter in 10-second cycles with 30-second pauses
4. Continue until the oil pressure gauge shows correct pressure
5. Verify there is no abnormal metallic noise during cranking

:::tip Priming Details Crank for ~35 seconds total to build oil pressure (community consensus). The oil pump was pre-primed with oil during assembly. Expect smoke on first start — assembly lube, grease, fingerprints, and superglue on apex seals will all burn off. This is normal. :::

Pre-Start Checks

• Correct oil level (up to the FULL mark)
• Coolant filled and bled of air
• All hoses connected and tightened
• All electrical connectors plugged in
• No visible leaks
• New spark plugs installed and torqued
• New coils installed

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11. Reinstallation in the Vehicle

1. Install the engine with a hoist
2. Reconnect the engine mounts (3 points)
3. Reconnect the driveshaft
4. Reconnect the shifter linkage
5. Reconnect the wiring harness (per labels)
6. Reconnect coolant, fuel, and vacuum hoses
7. Install the exhaust line (header + midpipe)
8. Install the alternator and power steering pump
9. Install the starter
10. Fill fluids:
    • Engine oil: ~5.7L (check on dipstick)
    • FL-22 coolant: ~8.2L (bleed air)
    • Check brake fluid, power steering fluid

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12. First Start and Break-In

First Start

1. Prime the engine (priming procedure above)
2. Reinstall the coils and fuel pump fuse
3. Start the engine - should start within a few seconds
4. Hold RPM between 1,500 and 2,000 RPM for the first 20 minutes
   • Do NOT let it idle
   • Monitor temperature (OBD2 if possible)
   • Verify there are no leaks of oil or coolant
5. Check ignition timing if possible
6. Let cool completely (2-3 hours)

Break-In Procedure (first 1,000 miles / 1,500 km)

Phase	Miles	Instructions
Phase 1	0-200	Vary RPM (2,000-4,000 RPM), NEVER full throttle, NEVER WOT
Phase 2	200-500	Progressively increase up to 5,000 RPM, moderate acceleration
Phase 3	500-1,000	Progressively increase up to 7,000 RPM, first hard acceleration

(FC3S Pro)

:::tip Break-In Oil Changes

• First oil change at 500 miles (800 km) - mandatory
• Second oil change at 1,500 miles (2,400 km)
• After that, follow the normal schedule (every 3,000-5,000 miles) :::

Post-Break-In Checks

• No oil leaks
• No coolant leaks
• Stable engine temperature (monitor via OBD2)
• Rotary compression test (should show significant improvement)
• No CEL warning light
• Stable hot idle (~750 RPM)

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13. Common Pitfalls and Mistakes to Avoid

Mistake	Consequence
Reusing seal washers on tension bolts	Coolant/oil leak = engine destroyed
Forgetting a coolant seal	Oil/coolant mix = engine destroyed
Installing a rotor backwards (face 1/2/3)	Uneven compression
Forcing an apex seal into its groove	Seal breakage on startup
Not priming oil before starting	Immediate bearing failure
Torquing e-shaft bolts to wrong spec	Plate deformation / compression leak
Forgetting an OMP O-ring	Blocked oil line = accelerated seal wear
Letting it idle during break-in	Premature carbon buildup
Corner seal plug facing wrong way	Plug falls out, destroys engine through ports
Oil control ring springs in backwards	Springs spin and destroy O-rings
Outer coolant seal twisted during install	Coolant leak into engine
Torquing tension bolts without rotating engine between passes	Engine extremely stiff, apex seal ends won't seat
Disassembling oil pump unnecessarily	Very difficult to reassemble keyway

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14. Community Tips from Video Sources

Practical advice from experienced RX-8 builders and rotary specialists who documented their builds on YouTube.

Disassembly & Inspection

Topic	Advice
Borescope before buying	Always borescope an engine before purchase or teardown — assess housing condition before spending time and money
Check oil for metal	Glitter/metal shavings in the oil pan indicate catastrophic internal damage
Don't force the e-shaft	If you feel significant resistance when rotating the eccentric shaft, stop — you can score the housing and destroy remaining value
Carbon-lock is the #1 failure	Apex seals carbon-lock into rotor grooves, losing their ability to spring outward. The root cause is often owner behavior: short trips, no premixing, never revving out
Housing assessment	Run your finger over the trochoid — grooves you can feel = compression loss. For the Renesis, resurfacing is usually more expensive than sourcing replacement housings
Torington bearings	Check for disintegrating needle bearings — if found, remove all fragments before they end up somewhere critical
Engine lifespan	Engines can fail at 30K miles with poor treatment or last 115K-120K+ with proper care

Compression Diagnostics

Pattern	Likely Cause
One face low on a rotor	Side seal issue
Two adjacent faces low on a rotor	Apex seal or corner seal issue (air bleeding between chambers)
Example: "90, 40, 40"	Classic apex seal failure pattern

Assembly Tips

Trick	Detail
Superglue corner pieces	Lightly superglue the small apex seal corner piece to the main body for easier assembly. Glue breaks off on first run.
Old apex seal as tool	Use an old apex seal to hold corner seals in alignment during rotor assembly
Grease/Vaseline for seal retention	Coat corner seals and side seals with grease or Vaseline to hold them in place when flipping the rotor
Keep seals indexed	Use the barcode on the gear side of the rotor as reference — call that apex #1, then clockwise 1-2-3
Two-person center plate	Center plate installation requires two people: one lifts the e-shaft from below while the other slides the plate over the dowels
Install oil pressure regulator early	Thread it into the rear iron before stacking — much easier than trying to install it later
Rear rotor orientation	Rear rotor gear faces outward (opposite to front rotor). Front rotor has "F" serial, rear has "R"
Don't disassemble the oil pump	Unless you had a confirmed oil pump failure (very rare), leave it as a unit. The keyway is very difficult to reassemble
Front main seal depth	Use the old seal as a depth stop when hammering in the new one — flush with the front cover only. You can hammer it in too far
Lift UP on breaker bar	When loosening the front hub bolt, lift UP (not push down) on the breaker bar to minimize force on the engine stand

Tension Bolt Notes

Detail	Info
Progressive torque	Common community sequence: 10 → 20 → 30 ft-lbs in the specified star pattern
4 extra-long bolts	The Renesis has 4 longer tension bolts at specific positions (bottom-left, 3/4/5 o'clock). These must go in the correct holes where the casting is thicker
Rotate between passes	After each torque pass, rotate the engine to let apex seal end pieces break free and seat properly
Rotation check	The assembled engine must turn over with less than 20 ft-lbs. If it takes more, something is wrong — likely an apex seal corner jammed between iron and housing

Bearing Selection

Color	Notes
Yellow	Largest inner diameter = most oil clearance. Community preference, though factory procedure requires matching bearing color to measured journal dimensions
Other colors	Smaller sizes. Difference between biggest and smallest is minuscule
Set screw	Use Loctite blue only on the stationary gear set screw — red Loctite will make it impossible to remove

Oil System

Topic	Advice
OMP (oil metering pump)	Works great for street cars — no reason to delete. Burns ~1 quart every 3,000 miles by design
SOHN adapter	Intercepts OMP feed to use clean oil from a separate tank instead of dirty crankcase oil. Cleaner burn
Oil pump	Very rarely fails. Don't disassemble unless confirmed failure. Prime with oil before installation (Workshop Manual)
Oil pump chain	Normally very loose even on low-mile engines — don't worry about it
5W-20 concerns	Specialty builders report abnormally excessive bearing wear in engines running the factory-recommended 5W-20, especially in cold climates (-20°C to -30°C)

First Start & Break-In (Community)

Step	Detail
Prime	Pull fuel pump AND injector fuses. Crank ~35 seconds to build oil pressure before reinstalling fuses
ECU relearn	Pump brake pedal ~20 times to reset all ECU adaptations
Expect smoke	Assembly lube, grease, superglue — all burn off. Normal
Anti-flood trick	Rev engine and turn key off mid-rev — cuts fuel injectors while engine spins down. Only use if flooding
Break-in: 0-500 mi	Under 4,000 RPM. Change oil at 500 mi (check for bearing material)
Break-in: 500-1,000 mi	Under 6,000 RPM
Break-in: 1,000+ mi	Normal driving

Budget & Cost Estimates (Community)

Scenario	Cost
Budget rebuild (seals only, reuse everything else)	~$900 in parts
Shop rebuild (professional labor)	$10,000+ avoided by DIY
Full engine build from scratch	~$20,000+
Used parts sourcing	Facebook Marketplace, subscriber donations, reuse from old engine

Porting (Advanced)

Topic	Detail
Street port — intake	Only modify the 5th and 6th upper ports. Do NOT modify lower port shape or timing
Critical geometry	The top of the intake port MUST come across at an angle, not straight across. The port edge and side seal must close like scissors — if cut straight, the side seal gets clipped
Street port — exhaust	Danger: you can easily cut through to the water jacket on exhaust ports. The most problematic area for first-timers
Runner work	Polish and match runners on both upper and lower ports for improved flow

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Video Sources

Video	Channel	Focus	Link
Rebuilding An RX8 Engine IN ONE VIDEO	Mr. Rad / Rad Potential	Full budget rebuild with detailed tips	YouTube
Building my Mazda RX8 Rotary Engine (13B-MSP Renesis Build)	—	First-time builder, OEM assembly	YouTube
ROTARY! 13B Renesis JUNK Engine Teardown	—	Detailed teardown and failure analysis	YouTube
THE RENESIS - Ported RX8 Engine Buildup	RX8 Specialties	Street port build, oil mods, professional shop	YouTube

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14. Additional Resources

Manuals and Documentation

• Mazda RX-8 Workshop Manual (RotaryHeads)
• Foxed.ca - RX-8 Manuals
• Renesis Training Material (RX8Club)
• StarMazda Technical PDF
• Rotary Engine Illustrated

Parts Suppliers

Supplier	Specialty	Link
Mazmart	OEM parts, rebuild kits, thermostat upgrade	mazmart.com
Atkins Rotary	Rebuild kits, performance parts	atkinsrotary.com
Mazda Dealer	OEM parts by reference	Local dealership

Recommended Products (Mazmart)

Product	Price	Link
I-Rotary Apex Seals Renesis	$873	Mazmart
RX-8 NGK Ignition Set (OEM Coils, NGK Wires, NGK Plugs)	$450	Mazmart
RE-medy Low Temperature Thermostat for RX-8	$76.60	Mazmart
RX-8 Engine Mounts (all years)	$206-$445	Mazmart
RX-8 OEM Oil Filter (09-12)	$9.13	Mazmart

Community and Support

Resource	Link
RX8Club.com - Tech Garage	Series I / Series II
RX8Club.com - DIY Forum	Series I
RX8Club - Engine Rebuild Thread	RX-8 Engine Rebuild Guide
Compression Calculator	Foxed.ca

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This guide is provided for informational purposes. Always refer to the official Mazda Workshop Manual for exact torque values, tolerances, and detailed procedures. Community tips sourced from YouTube rebuild videos — see Video Sources section above.