Exhaust Manifold Gasket – Fits MerCruiser 140 HP 3.0L (Replaces 27-53354, 18-2912, 31570, 9-61417)
Exhaust Manifold Gasket – Fits MerCruiser 140 HP 3.0L (Replaces 27-53354, 18-2912, 31570, 9-61417) is backordered and will ship as soon as it is back in stock.
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Exhaust Manifold Gasket – Fits MerCruiser 140 HP 3.0L (Replaces 27-...
Exhaust Manifold Gasket – Fits MerCruiser 140 HP 3.0L (Replaces 27-53354, 18-2912, 31570, 9-61417) is backordered and will ship as soon as it is back in stock.
Product Details
This is a direct-replacement exhaust manifold gasket for MerCruiser 140 HP 3.0L (181 CID) four-cylinder engines using a wet-joint exhaust configuration in GM-based stern-drive applications. It is designed to seal the joint between the exhaust manifold and cylinder head and help prevent water and exhaust leaks.
The gasket is listed as a cross-reference for Mercury/MerCruiser 27-53354, Sierra 18-2912, GLM 31570, and Mallory 9-61417.
- Installation type: Wet-joint application between the exhaust manifold and cylinder head.
- Application: GM-based MerCruiser 181 CID (3.0L) inline four-cylinder stern-drive engines.
- Construction: Marine-grade gasket material intended for use in marine exhaust-system conditions.
Part Number Matrix
Use the following references when comparing the replacement gasket with your existing part or catalog listing.
| Brand | Part Number |
|---|---|
| Mercury / MerCruiser | 27-53354 |
| Sierra | 18-2912 |
| GLM | 31570 |
| Mallory | 9-61417 |
Engine & Model Compatibility
Confirm the engine model, exhaust-joint design, and year range before ordering. The listed application is for MerCruiser 140 stern-drive models with a GM 181 CID (3.0L) inline four-cylinder engine and wet-joint exhaust configuration.
| Brand | Model | Rated HP | Engine | Years | OEM Part No. | Application Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 140 Stern Drive | 140 HP | GM 181 CID (3.0L) inline 4-cylinder, gasoline | 1968–1982 | 27-53354 | Wet-joint exhaust configuration |
Technical Specifications
- Product Type
- Exhaust Manifold Gasket
- Application
- Wet-joint exhaust system
- Engine
- GM 181 CID (3.0L) inline four-cylinder gasoline engine
- Rated Engine Output
- 140 HP
- Connection
- Bolt-on installation
- Material
- Marine-grade gasket material
- Reference Number
- 27-53354
What’s in the Box
- 1 × Exhaust manifold gasket
Installation Notes
- Disconnect the boat’s battery and allow the engine to cool completely. Drain the cooling system as required by the service procedure.
- Remove any hoses, wires, or components that obstruct access to the exhaust manifold.
- Loosen and remove the manifold fasteners, then carefully separate the manifold from the cylinder head.
- Clean both mating surfaces thoroughly. Remove old gasket material, rust, scale, oil, and debris without damaging the sealing surfaces.
- Position the new gasket with the bolt holes and water and exhaust passages correctly aligned.
- Reinstall the exhaust manifold. Hand-tighten the fasteners first, then tighten them in the manufacturer’s specified sequence and to the specified torque.
- Reconnect all removed components, refill the cooling system as required, and reconnect the battery. Start the engine and inspect the joint for water or exhaust leaks.
Troubleshooting & FAQ
How do I know if I have a wet-joint or dry-joint exhaust?
This gasket is intended for a wet-joint exhaust configuration. Verify the design by checking the service manual, the existing gasket, and the mating surfaces before installation. Do not substitute it for a dry-joint gasket solely because the engine model or horsepower appears similar.
What are the signs of a failing exhaust manifold gasket?
Possible symptoms include water or exhaust leakage at the manifold-to-cylinder-head joint, engine overheating, unusual exhaust noise, or reduced engine performance. Water contamination in the engine oil may also indicate a serious internal or exhaust-system sealing problem that requires immediate inspection.
Should I use sealant with this gasket?
Install the gasket according to the engine manufacturer’s service instructions. Many manifold gaskets are designed for dry installation, and unapproved sealant can interfere with correct seating or obstruct passages.
Can I reuse my old manifold bolts?
Inspect all fasteners for corrosion, damaged threads, stretching, or other wear. Replace damaged or questionable fasteners and tighten them using the manufacturer’s specified torque and sequence.
Is this an OEM part?
This listing is for an aftermarket replacement gasket, not a Mercury/MerCruiser-branded OEM component. The listed cross-reference numbers are provided for identification and application comparison.
How should I confirm compatibility?
Compare the gasket shape and passage layout with your original part, then confirm the engine model, horsepower, year, and wet-joint exhaust configuration. When those details do not match, consult the engine service manual or a qualified marine technician before ordering.
What are the shipping and warranty terms?
Shipping options and delivery estimates are shown at checkout. Warranty and return eligibility are subject to the applicable store policy; contact support with your order details if assistance is needed.
Safety & Important Information
- Verify the part shape, passage layout, engine specifications, and exhaust-joint design before installation.
- Do not operate the engine if water or exhaust leaks are present after installation.
- Follow the engine manufacturer’s service procedures for draining, refilling, torque values, and fastener sequence.
- Professional marine-service installation is recommended when the engine or exhaust system is difficult to access.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts selected for dependable fit and service in real-world marine applications.
- Fast Global Fulfillment — Shipping options and estimated delivery times are provided during checkout.
- Manufacturer-Direct Value — We aim to provide practical replacement parts at competitive prices.
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