Sierra 118-2172 Engine Coupler Kit for MerCruiser GM V6 & V8 Pre-Vortec Engines

The Sierra 118-2172 Engine Coupler Kit is a critical drivetrain component designed to connect MerCruiser GM engines to stern drives. This specialized adapter coupler is specifically engineered for engine replacement applications where you are upgrading from an older GM V6 or V8 engine with a 2-piece rear main seal to a newer engine with a 1-piece rear main seal.

Key Features:

• Adapts 3-1/2 inch crankshaft bolt pattern (2-piece seal) to 3 inch bolt pattern (1-piece seal)
• Complete kit includes coupler, studs, washers, and nuts for installation
• Designed for MerCruiser GM V6 and V8 engines (305 and 350 CID)
• Manufactured to meet or exceed OEM specifications
• Hub-style coupler compatible with 1986 and later engine conversions

OEM Cross-References:

• Replaces MerCruiser 14505A2
• Replaces OMC 775495
• Replaces Mallory 9-72500
• Replaces GLM 11520

This pre-Vortec engine coupler is commonly used when replacing pre-1985 MerCruiser 350 ci or 305 ci engines with 1986 or later 5.7L (350 ci) or 5.0L (305 ci) engines. Sierra Marine products are manufactured from quality materials and backed by comprehensive warranty coverage for reliable performance on the water.