CARDAN NUT WRENCH 91-17257T 91-8053741 REC90490

Function and technical context

The cardan nut wrench is the specific tool designed for tightening and removing the cardan shaft nut on MerCruiser Bravo sterndrive transmission systems. It works directly on the tail transmission assembly, allowing you to immobilize and work with precision on the nut that fixes the propulsion shaft to the aft crankcase. Without this specialized wrench, it is impossible to correctly dismantle or tighten said nut without risk of damaging the internal components of the drive train, which makes this tool indispensable for any workshop or mechanic that works with Bravo ONE, Bravo TWO, Bravo THREE and their Bravo X variants.

When to use or replace this part?

This service key is necessary whenever an intervention is carried out on the cardan or drive shaft nut of a MerCruiser Bravo tail: replacement of bellows, inspection of the transmission seal, change of tail oil or complete disassembly of the propulsion unit. It is recommended to verify the condition of the tool each time it is used, checking that the stems and the adjustment profile do not show wear that could cause slipping and deteriorate the nut. Having this key in the workshop avoids improvisations that can lead to costly damage to transmission components that are difficult to access.

Mercury/MerCruiser

Equivalent manufacturer part numbers