Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP (Replaces 27-18272, 27-97863)
Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP (Replaces 27-18272, 27-97863) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP (Replaces 27-...
Product Details
This is a direct replacement Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP, designed for MerCruiser 4-cylinder 165HP, 170HP, 180HP, 190HP, and 3.7LX engines with aluminum exhaust manifolds from 1985–1989. It ensures a perfect seal between the exhaust elbow and the manifold.
This gasket serves as a direct interchange for Mercury/MerCruiser 27-18272 and 27-97863, Sierra 18-0881-1, GLM 32470, Osco 8561-G, and Mallory 9-61412.
- Engineered for direct-fit installation.
- Made from OEM-spec gasket material compatible with aluminum manifolds.
- Seals the connection between the exhaust elbow and manifold to prevent leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 27-18272 |
| Mercury/MerCruiser | 27-97863 |
| Sierra | 18-0881-1 |
| GLM | 32470 |
| Osco | 8561-G |
| Mallory | 9-61412 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, ensure your engine's serial number falls within the specified range for a correct fit.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 165 (4-Cyl.) | 165 | 4-Stroke | 1987 | 27-18272 | Serial Range: 0B434941-0B774251 |
| MerCruiser | 170 | 170 | 4-Stroke | 1985–1986 | 27-18272 | Serial Range: 6916779-0B434940 |
| MerCruiser | 180 | 180 | 4-Stroke | 1987 | 27-18272 | Serial Range: 0B436391-0B775248 |
| MerCruiser | 190 | 190 | 4-Stroke | 1985–1986 | 27-18272 | Serial Range: 6916779-0B436390 |
| MerCruiser | 3.7LX | 165–190 | 4-Stroke | 1988–1989 | 27-18272 | Serial Range: 0B775249 & Up |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation
- Direct fit
- Housing Material
- OEM-spec gasket material
- Housing Color
- White/Off-white
- Connection
- Exhaust elbow to manifold
- Other Technical Attributes
- Aluminum manifold compatible
What’s in the Box
- 1 x Exhaust Elbow Gasket (27-18272/27-97863)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Drain the cooling system as required to access the exhaust manifold and elbow.
- Carefully remove the bolts securing the exhaust elbow to the manifold.
- Remove the old gasket and thoroughly clean both mounting surfaces. Ensure they are free of old gasket material, corrosion, and debris.
- Position the new gasket correctly on the manifold.
- Re-install the exhaust elbow and tighten the bolts to the manufacturer's specified torque sequence and values.
- Refill the cooling system, reconnect the battery, and check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know this gasket fits my MerCruiser 3.7L engine?
This gasket is specifically for MerCruiser 4-cylinder 165, 170, 180, 190 HP and 3.7LX models from 1985–1989 that have aluminum exhaust manifolds. Always verify your engine's model, year, and serial number against our compatibility table before ordering.
What are the signs of a failed exhaust elbow gasket?
Common symptoms include visible water leaks around the elbow-manifold joint (especially when the engine is running), rust stains originating from the joint, engine overheating, or water intrusion into the cylinders, which can cause significant engine damage.
Is any sealant required with this gasket?
Generally, this type of gasket is designed to be installed dry. However, always refer to your specific engine service manual for the final word. Applying sealants where none are required can sometimes cause the gasket to slip or fail prematurely.
How often should this gasket be replaced?
It's recommended to replace the exhaust elbow gasket whenever the exhaust elbow or manifold is serviced or removed. As a preventative measure, inspect it regularly for signs of leaks or deterioration, especially in saltwater environments.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free, with expedited options available at checkout where applicable.
What is your warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their 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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