Exhaust Elbow Gasket for MerCruiser 3.7L 4-Cylinder 170/470 (1985–1989) – Replaces 27-18272, 27-97863
Exhaust Elbow Gasket for MerCruiser 3.7L 4-Cylinder 170/470 (1985–1989) – Replaces 27-18272, 27-97863 is backordered and will ship as soon as it is back in stock.
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Exhaust Elbow Gasket for MerCruiser 3.7L 4-Cylinder 170/470 (1985–1...
Exhaust Elbow Gasket for MerCruiser 3.7L 4-Cylinder 170/470 (1985–1989) – Replaces 27-18272, 27-97863 is backordered and will ship as soon as it is back in stock.
Product Details
This direct-replacement Exhaust Elbow Gasket is designed for MerCruiser 3.7L 4-cylinder 170 and 470 engines with aluminum exhaust manifolds from 1985–1989. It seals the mounting connection between the exhaust elbow and manifold when the elbow is installed or serviced.
This is a single gasket, not a complete mounting kit. The gasket is listed as a replacement for MerCruiser reference numbers 27-18272 and 27-97863.
- Direct-fit exhaust elbow mounting gasket for specified MerCruiser applications.
- Helps seal the elbow-to-manifold joint and prevent exhaust or cooling-water leakage at the connection.
- Suitable for the aluminum-manifold applications identified below.
Part Number Matrix
Use these manufacturer and aftermarket references to compare your existing gasket before ordering.
| Brand | Part Number |
|---|---|
| MerCruiser | 27-18272 |
| MerCruiser | 27-97863 |
| MerCruiser | 18272 / 97863 |
| GLM | 32470 |
| Sierra | 18-0881 / 18-0881-1 |
| Mallory | 9-61412 |
| OMC | 0508753 |
Engine & Model Compatibility
Confirm the engine model, manifold construction, and model year before ordering. The fitment information for this gasket should be kept together because the aluminum-manifold condition is part of the application.
| Brand | Engine / Model | Displacement | Rated Model | Stroke | Years | Manifold Condition | Reference Numbers |
|---|---|---|---|---|---|---|---|
| MerCruiser | 170 / 470, 4-cylinder | 3.7L | 170 / 470 | 4-Stroke | 1985–1989 | Aluminum exhaust manifold | 27-18272, 27-97863 |
| MerCruiser | 4-cylinder applications | 3.7L | 470 | 4-Stroke | Not applicable to 1976–1982 470 cast-iron-manifold applications | Verify aluminum manifold; cast-iron applications are excluded where noted | 27-18272, 27-97863 |
Technical Specs
- Product Type
- Exhaust elbow gasket
- Quantity
- 1 gasket
- Installation
- Direct fit when matched to the listed application
- Connection
- Exhaust elbow to exhaust manifold
- Compatible Manifold
- Aluminum exhaust manifold
- Displacement
- 3.7L
- Engine Configuration
- 4-cylinder MerCruiser 170/470 applications
- Years
- 1985–1989
What’s in the Box
- 1 x Exhaust elbow gasket
Mounting hardware, exhaust elbows, manifolds, sealant, and complete mounting kits are not included.
Installation Notes
- Make sure the engine is completely cool and disconnect the battery before beginning work.
- Confirm that the engine is a listed MerCruiser 3.7L 4-cylinder 170/470 application with the required aluminum exhaust manifold.
- Drain or isolate the cooling system as required to access the exhaust elbow and manifold.
- Remove the fasteners securing the exhaust elbow and carefully separate the elbow from the manifold.
- Remove the old gasket and clean both mating surfaces thoroughly. Remove old gasket material, corrosion, and debris without damaging the surfaces.
- Position the new gasket correctly between the exhaust elbow and manifold.
- Reinstall the elbow and tighten the fasteners according to the engine manufacturer's specified sequence and torque values.
- Restore the cooling system, reconnect the battery, start the engine, and inspect the joint for leaks.
Troubleshooting & FAQ
Which MerCruiser engines does this gasket fit?
It is listed for MerCruiser 3.7L 4-cylinder 170 and 470 engines with aluminum exhaust manifolds from 1985–1989. Do not use the model name alone to confirm fitment; verify the year and manifold construction as well.
Does it fit every MerCruiser 470 engine?
No. The listed application excludes 1976–1982 470 engines with cast-iron manifolds. Check the manifold on your engine before ordering.
Is this a complete exhaust elbow mounting kit?
No. This listing is for one exhaust elbow gasket only. Fasteners, an elbow, a manifold, and other mounting-kit components are not included.
What are the signs of a failed exhaust elbow gasket?
Possible signs include leakage at the elbow-to-manifold joint, rust or corrosion marks around the connection, overheating, or water entering areas where it should not. Stop operation and inspect the assembly if a leak is suspected.
Is sealant required?
Install the gasket according to the applicable service manual. Do not apply sealant unless the manufacturer specifically calls for it, because an unsuitable sealant can interfere with gasket positioning or sealing.
When should the gasket be replaced?
Replace the gasket whenever the exhaust elbow or manifold is removed, or whenever inspection shows damage, compression loss, corrosion, or leakage.
Is this an OEM part?
This is an aftermarket replacement gasket. It is listed to replace MerCruiser reference numbers 27-18272 and 27-97863 and to cross-reference with the aftermarket numbers shown above.
What should I verify before ordering?
Verify the engine brand, 3.7L displacement, 4-cylinder 170/470 model, 1985–1989 model-year range, and aluminum exhaust manifold. Also compare the original gasket and reference number.
Safety & Important Info
- Allow the engine and exhaust components to cool completely before service.
- Confirm the aluminum-manifold requirement; cast-iron-manifold applications are not automatically interchangeable.
- Use the engine service manual for fastener sequence, torque values, cooling-system procedures, and sealant requirements.
- Professional installation is recommended if you are unfamiliar with exhaust and cooling-system service.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine engine and stern-drive service applications.
- Application-Focused Listings — Product details identify the model, year, manifold, and reference-number conditions that affect fitment.
- Practical Service Support — Compare your original component and consult the applicable service information before installation.
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