Original Mercruiser Supplements Kit 805627A1

Function and technical context

The shim assembly kit is a set of calibrated washers that acts as a clearance and preload adjustment element in the bevel groups and gears of the Bravo series sternum-drive transmissions. It works within the transmission system, specifically in the axial adjustment of the bevel gear trains that transfer power from the engine to the propeller. Correct calibration ensures optimal contact between the pinion teeth and the ring gear, preventing premature wear, excessive noise and catastrophic failure of the transmission case. As it is an original MerCruiser factory spare part with reference 805627A1, it ensures the adjustment tolerances specified by the manufacturer, something critical in high-load transmissions such as the Bravo X and Bravo XR.

When to replace this part?

The need to replace or check the shim kit is evident when abnormal gear noise (rattling or metallic hum) appears while driving, excessive play in the propeller shaft or unusual vibration in the transmission. It is recommended to check the condition and size of the shims whenever the transmission case is disassembled for any major intervention, as well as every time gears, bearings or the pinion itself are replaced. Using the original factory part in this setting is essential: an incorrect shim can cause accelerated gear wear or transmission failure at sea, with the resulting high repair cost.