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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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Manifold Gasket – Fits MerCruiser 140 HP 3.0L (Replaces 27-...
Product Details
This is a direct replacement Exhaust Manifold Gasket for MerCruiser 140 HP 3.0L (181 CID) 4-cylinder engines (GM-based stern drive applications) from years 1968–1982. It ensures a proper seal for the wet joint between the exhaust manifold and the cylinder head, preventing water and exhaust leaks.
It serves as a direct cross-reference for Mercury/MerCruiser 27-53354, Sierra 18-2912, GLM 31570, and Mallory 9-61417.
- Installation Type: Wet joint application (seals between the manifold and cylinder head).
- Material: High-density, marine-grade gasket material built for durability in harsh marine environments.
- Engine Configuration: Specifically for wet joint exhaust systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury / MerCruiser | 27-53354 |
| Sierra | 18-2912 |
| GLM | 31570 |
| Mallory | 9-61417 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
For MerCruiser owners, these gaskets fit GM 181 CID (3.0L) Inline 4-cylinder stern drive models configured with a wet joint exhaust, primarily from 1968 through 1982.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 140 Stern Drive | 140 | 4-Stroke | 1968–1982 | 27-53354 | GM 181 CID (3.0L) Inline 4-Cyl |
| MerCruiser | 140 Stern Drive | 140 | 4-Stroke | 1972–1982 | 27-53354 | Wet Joint Model, Chevy 4-Cyl 181 (3.0L) CID |
Technical Specs
- Product Type
- Exhaust Manifold Gasket
- Installation
- Wet Joint (between manifold and cylinder head)
- Fuel Type
- Gasoline
- Connection
- Bolt-on
- Material
- Marine Grade Gasket Material
- Other Attributes
- Used with wet joint exhaust configuration
What’s in the Box
- 1 x Exhaust Manifold Gasket (27-53354)
Installation Notes
- Disconnect the boat's battery and completely drain the engine's cooling system.
- Remove any hoses, wires, or components that obstruct access to the exhaust manifold.
- Carefully loosen and remove the bolts securing the old exhaust manifold, then detach the manifold from the cylinder head.
- Thoroughly clean both mating surfaces on the cylinder head and the manifold. Ensure they are free of old gasket material, rust, and debris.
- Position the new gasket, making sure it aligns perfectly with all bolt holes and water/exhaust passages.
- Reinstall the exhaust manifold. Hand-tighten the bolts first, then torque them to the manufacturer's specifications in the recommended sequence.
- Reconnect all previously removed components, refill the cooling system, and reconnect the battery. Start the engine and carefully inspect for any exhaust or water leaks.
Troubleshooting & FAQ
How do I know if I have a wet joint or dry joint exhaust?
This is a wet joint gasket, designed for systems where engine coolant passes through the manifold and riser. Dry joint systems have separate passages for coolant and exhaust. Check your service manual or inspect the mating surfaces of your old parts to confirm your boat's configuration.
What are the signs of a failing exhaust manifold gasket?
Common symptoms include visible water leaks from the joint between the manifold and cylinder head, water contamination in the engine oil (giving it a milky appearance), engine overheating, or a noticeable loss of performance due to an exhaust leak.
Should I use sealant with this gasket?
Generally, these gaskets are designed to be installed dry. The gasket material is engineered to create a seal under compression. Using sealant can sometimes interfere with proper seating unless explicitly recommended in your engine's service manual.
Can I reuse my old manifold bolts?
It is strongly recommended to use new, marine-grade bolts. Old bolts can be corroded, fatigued, or stretched from previous use, which can prevent them from achieving the correct torque and may lead to premature failure of the new gasket seal.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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