27-53354 Exhaust Manifold Gasket for MerCruiser 140
27-53354 Exhaust Manifold Gasket for MerCruiser 140 is backordered and will ship as soon as it is back in stock.
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27-53354 Exhaust Manifold Gasket for MerCruiser 140
27-53354 Exhaust Manifold Gasket for MerCruiser 140 is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
27-53354 Exhaust Manifold Gasket for MerCruiser 140
Aftermarket exhaust manifold gasket referenced to 27-53354 for MerCruiser Model 140, GM 181 CID inline-four applications from 1968 to 1982. It seals the manifold-to-cylinder-head joint.
Configuration & Specifications
| Installation Joint | Exhaust manifold gasket position (manifold-to-cylinder head under MerCruiser 27-53354; not for exhaust elbow or manifold end-cap joints) |
|---|---|
| OMC Port Configuration | Large-port version corresponding to 908079 / GLM 31570 (distinct from the small-port 3853256 / GLM 33580 version) |
| Engine Block Architecture | GM 181 CID / 3.0L inline 4-cylinder (140 HP) |
Engine Applications
- MerCruiser Model 140 / Inline GM 181 CID, four-cylinder, 140 HP; 1968–1982; Wet Joint manifold-to-cylinder-head gasket.
Reference Numbers
The numbers below are provided as identification references for part selection and do not independently establish direct interchangeability across every engine variation or indicate manufacturer identity.
| MerCruiser Reference Numbers | 27-53354, 53354, 802377 |
|---|---|
| OMC / OMC Cobra Reference Numbers | 0508561, 508561, 0778121, 0908079, 908079 |
| Aftermarket Reference Numbers | GLM 31570, Mallory 9-61417, Sierra 18-2912, Sierra 18-2912-1 |
| Other Configuration Comparison (Not This Part) | OMC 3853256, GLM 33580 (separately listed small-port version) |
Supplied Parts
This listing is for the exhaust manifold gasket only, not a complete exhaust manifold assembly or a complete manifold repair kit.
- Exhaust manifold gasket
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Ensure the engine is shut off and completely cool, and disconnect the battery to prevent accidental starting before loosening any exhaust components.
- Support heavy exhaust manifold castings securely during removal and installation, and protect the machined sealing surfaces on both the cylinder head and manifold from gouges or debris.
- Compare the replacement gasket directly against the original part, port openings, and mounting bolt pattern at the exhaust manifold joint. Do not use this gasket at an exhaust elbow or manifold end-cap joint.
- Follow your engine manufacturer's service manual for surface preparation, fastener tightening sequence, and torque specifications. If any exhaust leak or abnormal operating condition occurs after reassembly, stop the engine and inspect the joint.
The Serdamarine Approach
Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.
Questions Before Replacement
How does this OMC 908079 / GLM 31570 gasket differ from 3853256 / GLM 33580?
For OMC 140 HP GM 181 CID / 3.0L (1973–1990) applications, this gasket corresponds to the large-port reference 0908079 / 908079 (GLM 31570). It is distinct from the separately listed small-port gasket under reference 3853256 (GLM 33580).
Can this gasket be used for the exhaust elbow or manifold end cap on the same engine?
No. This part is solely for the exhaust manifold gasket position—identified under MerCruiser 27-53354 as the manifold-to-cylinder head gasket. Exhaust elbows and manifold end caps require their own dedicated gasket profiles.
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