Sierra 18-8206-1 Transom Seal Kit for MerCruiser Alpha One Gen II

The Sierra 18-8206-1 is a comprehensive transom seal kit designed specifically for MerCruiser Alpha One Generation II stern drives from 1991 to present (serial numbers 0D469859 and up). This complete service kit provides all the essential components needed for a thorough transom rebuild, ensuring reliable protection against water intrusion and maintaining optimal drive performance.

Complete Kit Includes:

• Greasable gimbal bearing (Sierra 18-21005) for extended service life
• U-joint bellows with retainer for drive shaft protection
• Exhaust bellows to seal exhaust system
• Shift cable bellows to protect shift linkage
• 3/4-inch ID water intake hose for cooling system
• Outdrive mounting gasket for proper sealing
• Bell housing gasket
• All necessary O-rings for complete assembly
• Stainless steel hose clamps for secure connections

This kit features a greasable gimbal bearing, which allows for routine maintenance and extended bearing life compared to sealed bearing designs. Sierra manufactures this kit to meet or exceed OEM specifications, making it a reliable aftermarket replacement for Mercury part number 30-803099T1. All rubber components are engineered to withstand the harsh marine environment and resist degradation from saltwater, heat, and constant flexing.

Replaces OEM Part Numbers: Mercury 30-803099T1, OMC 775493, Mallory 9-72900