Sierra Oil Pan Gasket - SIE-18-1237

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.