0508561 Exhaust Manifold Gasket for OMC Cobra 140
0508561 Exhaust Manifold Gasket for OMC Cobra 140 is backordered and will ship as soon as it is back in stock.
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0508561 Exhaust Manifold Gasket for OMC Cobra 140
0508561 Exhaust Manifold Gasket for OMC Cobra 140 is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
0508561 Exhaust Manifold Gasket for OMC Cobra 140
Aftermarket exhaust manifold gasket referenced to OMC 0508561 for 140 HP, GM 181 CID / 3.0L four-cylinder applications from 1973 to 1990. Match the large-port manifold configuration associated with 0908079 / GLM 31570.
Configuration & Specifications
| Installation Joint | Exhaust manifold gasket position (manifold-to-cylinder head joint under MerCruiser 27-53354); not for exhaust elbow or manifold end-cap joints |
|---|---|
| Port Configuration (OMC) | Large-port version corresponding to OMC 908079 / GLM 31570 (distinct from the small-port 3853256 / GLM 33580 version) |
| Engine Configuration | 140 HP Inline 4-Cylinder, GM 181 CID (3.0L) |
Engine Applications
- OMC Cobra Model 140, GM 181 CID / 3.0L, four-cylinder, 140 HP; 1973–1990; large-port manifold configuration.
Reference Numbers
The numbers below are provided as identification references for part selection and do not by themselves establish universal interchangeability or original manufacturer identity.
| MerCruiser OEM References | 27-53354, 53354, 802377 |
|---|---|
| OMC / OMC Cobra OEM References | 0508561, 508561, 0778121, 0908079, 908079 |
| Aftermarket References | GLM 31570, Mallory 9-61417, Sierra 18-2912, Sierra 18-2912-1 |
| Different Specification Comparison (Not This Part) | OMC 3853256, GLM 33580 (separately listed small-port version for OMC applications) |
Supplied Parts
- Exhaust manifold gasket
This listing is for the exhaust manifold gasket only, not a complete exhaust manifold assembly or a complete manifold repair kit.
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Allow the engine and exhaust system to cool completely and secure the ignition to prevent accidental starting before loosening any fasteners.
- Support the exhaust manifold while removing mounting hardware, and protect the cylinder head and manifold mating surfaces from nicks or gouges when cleaning away old gasket material.
- Install this gasket at the exhaust manifold mounting position (such as the manifold-to-cylinder head joint identified by MerCruiser 27-53354); do not install it at the exhaust elbow or manifold end-cap joints.
- Follow the OEM service manual for fastener tightening sequence and torque specifications, and shut down the engine immediately for inspection if exhaust leaks or abnormal temperatures occur during initial operation.
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 is this gasket distinguished on OMC 140 HP 3.0L (181 CID) engines?
For OMC 140 HP 4-cylinder 181 CID / 3.0L GM applications (1973–1990), this gasket corresponds to the large-port reference 0908079 / 908079 (GLM 31570), which is distinct from the separately listed small-port reference 3853256 (GLM 33580).
Can this gasket be used for the exhaust elbow or manifold end caps on the same engine?
No. This part is solely for the exhaust manifold gasket position (identifying the manifold-to-cylinder head joint under MerCruiser 27-53354) and is not an exhaust elbow gasket, manifold end-cap gasket, or complete manifold repair kit.
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