RETAINER 26-43943 REC26-43993

Function and technical context

The 26-43943/26-43993 seal is a critical driveshaft sealing component on Mercury, Mariner and MerCruiser engines. This piece acts as a watertight barrier at the interface between the drive shaft and motor housing, preventing seawater and contaminants from penetrating the internal lubrication system. Its correct operation is essential to maintain the integrity of the propulsion system: any leak or deterioration of the seal compromises the protection of the engine and can cause accelerated corrosion, water entry into the crankcase and premature loss of lubricant.

When to replace this part?

Shaft seal wear is usually manifested by oil leaks around the drive shaft, water in the lubricant reservoir, or milky oil on the dipstick. Although there is no universal fixed interval, it is advisable to inspect the condition of the seal during each seasonal maintenance and consider its preventive replacement after 5-7 years of intense use or if the mentioned symptoms are detected. Replacing this component preventively is significantly more economical than facing a major engine repair due to corrosion or internal damage resulting from an undetected leak.

Engine Compatibility

Compatible MerCruiser and Mercury Mariner Engines

Equivalent manufacturer part numbers