Sierra 18-1237 V8 Oil Pan Gasket

Sierra 18-1237 Oil Pan Gasket for 265 - 400 hp

Sierra replacement oil pan gasket for Mercruiser Stern Drives, OMC Stern Drives and Volvo Penta engines.

• Fits MCM/MIE GM V-8 (305, 350 & 377 cid) engines w/ 1 pc. RM seal (1985 & newer)

Interchangeable with:

• GLM
• 39850
• Mallory
• 9-61504
• Mercruiser Stern Drive
• 27-138651
• 27-13865
• FI1101281
• OMC Stern Drive
• 3856138
• Volvo Penta
• 3856138

Frequently Asked Questions

What is the Sierra 18-1237 Oil Pan Gasket used for?

The Sierra 18-1237 Oil Pan Gasket is a replacement gasket for MerCruiser Stern Drive, OMC Stern Drive, and Volvo Penta applications. It is designed for specified MCM/MIE GM V-8 engines with a one-piece rear main seal, providing a replacement option for the oil pan gasket on compatible marine engines.

What engines does the Sierra 18-1237 Oil Pan Gasket fit?

The Sierra 18-1237 fits MCM/MIE GM V-8 engines with 305, 350, and 377 cubic-inch displacements that use a one-piece rear main seal. The listed application is for engines from 1985 and newer, so verify your engine configuration and rear main seal type before ordering.

Is the Sierra 18-1237 compatible with MerCruiser, OMC, and Volvo Penta engines?

Yes. The Sierra 18-1237 is listed as a replacement oil pan gasket for MerCruiser Stern Drives, OMC Stern Drives, and Volvo Penta engines. Compatibility is specifically identified for MCM/MIE GM V-8 engines with a one-piece rear main seal from 1985 and newer.

What rear main seal configuration does the Sierra 18-1237 Oil Pan Gasket require?

The Sierra 18-1237 is specified for MCM/MIE GM V-8 engines equipped with a one-piece rear main seal. Because the application is dependent on this configuration, confirm that your engine uses a one-piece rear main seal before selecting this oil pan gasket.

What part numbers is the Sierra 18-1237 Oil Pan Gasket interchangeable with?

The Sierra 18-1237 is interchangeable with GLM 39850 and Mallory 9-61504. Listed MerCruiser Stern Drive references are 27-138651, 27-13865, and FI1101281. OMC Stern Drive and Volvo Penta both list 3856138 as an interchangeable part number.

What should I verify before purchasing the Sierra 18-1237 Oil Pan Gasket?

Verify that your marine engine is an MCM/MIE GM V-8 with a 305, 350, or 377 cubic-inch displacement and a one-piece rear main seal. Also confirm the engine is a 1985 or newer application and compare the existing gasket or applicable part number with the listed interchange references.

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