Genuine Mazda BP6F-13-135 Upper Intake Manifold / Surge Tank Gasket
Replacement Genuine Mazda upper intake manifold gasket for Mazda MX-5 Mk2 NB and Mk2.5 NB-FL models fitted with the 1.8-litre petrol engine and automatic transmission.
Mazda describes the upper section of the intake manifold as the surge tank or plenum chamber. This gasket seals the joint between the upper surge tank and the lower intake manifold, preventing unmetered air from entering the engine.
A secure, airtight intake-manifold joint is essential for maintaining stable manifold vacuum and correct air-fuel control. The original gasket can harden, flatten or become damaged through age, heat cycles or intake-manifold dismantling.
One gasket is fitted per vehicle, and this listing supplies one Genuine Mazda gasket. It should be replaced whenever the upper intake surge tank is removed rather than attempting to reuse the compressed original gasket.
Important transmission restriction: BP6F-13-135 is for 1.8-litre MX-5 NB and NB-FL models with automatic transmission. Manual-transmission vehicles use a different surge-tank gasket.
- Part type: Upper intake manifold gasket
- Common names: Surge-tank gasket / plenum gasket / upper inlet-manifold gasket
- Mazda catalogue description: Gasket, Surge Tank
- Position: Upper intake manifold
- Location: Between the upper surge tank and lower intake manifold
- Engine application: 1.8-litre petrol engine
- Transmission application: Automatic transmission only
- Function: Seals the upper intake-manifold joint against vacuum and air leakage
- Quantity fitted per vehicle: 1
- Quantity supplied: 1 gasket
- Reusable component: No
- Upper intake manifold included: No
- Lower intake manifold included: No
- Throttle-body gasket included: No
- Manifold-to-cylinder-head gasket included: No
- Sealant included: No
- Brand: Genuine Mazda
- Part No.: BP6F-13-135
- MX-5 fitment: Mk2 NB and Mk2.5 NB-FL 1.8 automatic-transmission models
Possible signs of an intake-manifold gasket leak:
- High, unstable or uneven idle speed
- Engine hesitation or poor low-speed response
- Lean-running fault codes
- Misfire, particularly at idle
- Whistling or hissing from the intake manifold
- Reduced engine performance
- Vacuum leakage around the surge-tank joint
- Gasket visibly flattened, split or damaged after dismantling
Fitment advice: Confirm that the vehicle has a 1.8-litre engine and automatic transmission before ordering. Manual-transmission Mk2 and Mk2.5 models use different surge-tank gasket arrangements.
Replacement advice: Replace the gasket whenever the upper intake surge tank is separated from the lower manifold. Reusing the original compressed gasket may result in an intake-air leak even where it appears visually undamaged.
Other items to consider: Inspect the throttle-body gasket, lower intake-manifold gasket, vacuum hoses, PCV hoses, injector seals and any air or coolant hoses disturbed during dismantling. Consider purchasing replacement hose clamps where the originals are weakened or corroded.
Useful tools / consumables: Socket and spanner set, calibrated torque wrench, hose-clamp pliers, plastic gasket scraper, lint-free cleaning materials and suitable intake-system cleaner.
Difficulty guide: DIY Difficulty: Moderate. Replacement requires removal of the upper surge tank and careful disconnection of associated vacuum hoses, wiring and intake fittings.
Why Genuine Mazda? Genuine Mazda intake gaskets match the original port profile, fastener alignment, compressed thickness and sealing design. Correct dimensions help maintain stable manifold vacuum and prevent unmetered air entering the engine.
What’s in the box: One Genuine Mazda upper intake manifold / surge-tank gasket, part number BP6F-13-135.
Installation notes: Allow the engine to cool before dismantling the intake system. Label and disconnect the necessary intake hoses, electrical connectors and vacuum lines. Remove the upper surge tank following the applicable Mazda procedure. Remove the old gasket and clean both mating surfaces without scratching them or allowing debris into the open intake runners. Position the replacement gasket correctly, refit the surge tank and tighten the fasteners progressively to the applicable Mazda specification. Reconnect every hose and connector, then start the engine and check for stable idle and intake-air leaks.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 | Mk2 NB – 1.8 | NB8C | 1998–2002 | 140 | BP-4W | Petrol | Automatic | Upper intake manifold / surge-tank gasket; one fitted per vehicle; manual-transmission models use a different gasket |
| Mazda | MX-5 | Mk2.5 NB-FL – 1.8 | NB8C | 2002–2005 | 146 | BP-Z3 | Petrol | Automatic | Upper intake manifold / surge-tank gasket; one fitted per vehicle; confirm original automatic-transmission manifold arrangement |
| Vehicle Manufacturer | OEM Reference Number |
|---|---|
| Mazda | BP6F-13-135 |