Exhaust Elbow Gasket for MerCruiser 3.7L 170/470 – Replaces Mercury Marine 27-18272, 27-97863
Exhaust Elbow Gasket for MerCruiser 3.7L 170/470 – Replaces Mercury Marine 27-18272, 27-97863 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Exhaust Elbow Gasket for MerCruiser 3.7L 170/470 – Replaces Mercury...
Exhaust Elbow Gasket for MerCruiser 3.7L 170/470 – Replaces Mercury Marine 27-18272, 27-97863 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket exhaust elbow gasket seals the joint between the exhaust elbow or riser and the exhaust manifold on selected MerCruiser 3.7L four-cylinder engines. It is listed for MerCruiser 170 and 470 models from 1985–1989 with aluminum exhaust manifolds.
The gasket is also listed for four-cylinder engines with cast-iron manifolds, except 1976–1982 MerCruiser 470 applications. Always compare your engine model, year, manifold material, and existing gasket before ordering.
This gasket is a single replacement component, not a multi-piece gasket kit.
- Installs between the exhaust elbow or riser and the exhaust manifold.
- Designed for selected MerCruiser 3.7L four-cylinder applications.
- Aftermarket replacement for the listed OEM and aftermarket reference numbers.
Part Number Matrix
Use these manufacturer and aftermarket references to compare the gasket with the part being replaced. Reference numbers are provided for identification and cross-reference purposes.
| Brand | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 27-18272 | OEM reference |
| MerCruiser | 27-97863 | OEM reference |
| MerCruiser | 18272 | OEM number format variation |
| MerCruiser | 97863 | OEM number format variation |
| GLM | 32470 | Aftermarket reference |
| Sierra | 18-0881 | Aftermarket reference |
| Sierra | 18-0881-1 | Aftermarket reference |
| Mallory | 9-61412 | Aftermarket reference |
| OMC | 0508753 | OEM reference |
Engine & Model Compatibility
Confirm the complete application details before ordering. The company fitment record specifically lists the following MerCruiser applications:
| Brand | Engine / Model | Configuration | Years | Manifold Condition | Notes |
|---|---|---|---|---|---|
| MerCruiser | 170 | 3.7L, 4-cylinder | 1985–1989 | Aluminum manifold | Listed application |
| MerCruiser | 470 | 3.7L, 4-cylinder | 1985–1989 | Aluminum manifold | Listed application |
| MerCruiser | Four-cylinder applications | 3.7L family | Application-dependent | Cast-iron manifold | Except 1976–1982 MerCruiser 470 |
MerCruiser 3.7L applications can vary by model year and manifold construction. Do not rely on engine displacement alone; verify the manifold material and compare the original gasket and reference number.
Technical Specs
- Product Type
- Exhaust elbow or manifold riser gasket
- Application
- Selected MerCruiser 3.7L 4-cylinder stern-drive applications
- Installation Location
- Between the exhaust elbow or riser and the exhaust manifold
- Primary OEM Reference
- MerCruiser 27-18272
- Additional OEM Reference
- MerCruiser 27-97863; OMC 0508753
- Aftermarket References
- GLM 32470; Sierra 18-0881 and 18-0881-1; Mallory 9-61412
- Product Format
- Single gasket
- Manifold Compatibility
- Aluminum manifolds for listed 1985–1989 170/470 applications; cast-iron applications are subject to the stated year and model exception
What’s in the Box
- 1 x Exhaust elbow or manifold riser gasket
Installation Notes
- Ensure the engine is completely cool and disconnect the battery before starting work.
- Follow the engine and exhaust-system service instructions for draining coolant or seawater as applicable.
- Remove the exhaust elbow or riser from the manifold according to the manufacturer's service procedure.
- Clean both mating surfaces carefully. Remove old gasket material, corrosion, and debris without damaging the sealing surfaces.
- Place the new gasket in the correct orientation and confirm that all bolt holes and passages align before tightening.
- Reinstall the exhaust elbow or riser. Tighten the fasteners in the recommended sequence and to the manufacturer's specified torque.
- Restore the cooling system, start the engine, and inspect the joint for exhaust, coolant, or water leaks.
Troubleshooting & FAQ
Which MerCruiser engines is this gasket listed for?
The company fitment record lists MerCruiser 3.7L four-cylinder 170 and 470 applications from 1985–1989 with aluminum manifolds. It also lists four-cylinder cast-iron-manifold applications except 1976–1982 MerCruiser 470. Verify the exact model year and manifold construction before ordering.
What part numbers can I use to cross-reference this gasket?
Listed references include MerCruiser 27-18272 and 27-97863, GLM 32470, Sierra 18-0881 and 18-0881-1, Mallory 9-61412, and OMC 0508753.
Is this listing for one gasket or a kit?
This product is a single replacement exhaust elbow or manifold riser gasket. It does not include an exhaust elbow, riser, mounting hardware, or additional gaskets.
Where does the gasket install?
It installs at the mating joint between the exhaust elbow or riser and the exhaust manifold.
What are common signs of a failed exhaust elbow gasket?
Possible symptoms include an exhaust or water leak at the manifold-to-elbow joint, a hissing or ticking exhaust sound, cooling-system loss, or overheating. Stop operation and investigate promptly if a leak is suspected.
When should the gasket be replaced?
Replace the gasket whenever the exhaust elbow or riser is removed if the service procedure calls for a new gasket, or whenever the existing gasket shows leakage, damage, or compression loss.
Is this an OEM component?
This listing is for an aftermarket replacement gasket. MerCruiser, OMC, GLM, Sierra, and Mallory numbers are included only as manufacturer or aftermarket reference numbers for identification and fitment comparison.
Safety & Important Information
- Verify the engine model, year, manifold material, and reference number before ordering.
- Do not install this gasket on an application that differs from the stated fitment without confirming compatibility through the appropriate service information.
- Allow the engine and exhaust components to cool fully before service.
- Professional installation is recommended when working on marine exhaust and cooling systems.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for practical service and repair applications.
- Fitment-Focused Cataloging — Reference numbers and application details are provided to help you compare the replacement part with your original component.
- Aftermarket Value — Replacement components are offered as practical alternatives to the original part where the listed application matches.
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