BUSHING 90386-25M31 REC90386-25M31

Function and technical context

The 90386-25M31 bushing is a marine transmission structural component that provides support and alignment to the drive shaft within the engine block. It works on the power transmission system, ensuring that shaft rotation is performed uniformly and without runouts that could cause excessive vibrations. Its correct operation is critical to maintain the integrity of the camshaft and crankshaft; A worn or damaged bushing can cause abnormal clearances, loss of alignment of internal components and, consequently, premature failure of seals, bearings and adjacent bearings.

When to replace this part?

Symptoms of hub deterioration include unusual engine vibrations, clunking or knocking noises from the crankcase area, and visible shaft runout during inspection. Although there is no fixed maintenance interval, checking the bushings should be included in each seasonal check, especially after hours of intensive navigation in waters with sediment or sudden load changes. Replacing the hub preventively before critical wear occurs avoids costly and lengthy repairs in specialized workshops.

Equivalent manufacturer part numbers