COLLAR FOR 3 1/2 SHAFT

Function and technical context

The 3 1/2" shaft collar is an essential component of the transmission system on boats with outboard or inboard propulsion, whose function is to fix and retain the tail shaft in its axial position, preventing unwanted longitudinal displacements during engine operation. It works directly on the propulsion shaft, exerting a precise mechanical hold that guarantees correct alignment between the shaft and the other components of the drive train. A collar in poor condition or incorrectly installed can cause abnormal vibrations, premature wear of seals and bearings, and even the decoupling of the shaft in demanding navigation conditions. The reference TEN00524 is designed for shafts with a diameter of 3 1/2", so its correct selection according to the diameter of the shaft is decisive to guarantee an adjustment without undue play or tension.

When to replace this part?

The most common symptoms of a deteriorated shaft collar include noticeable vibrations in the driveline, clunking or knocking at various cruising speeds, and visible wear in the shaft contact area or on adjacent components such as seals and bushings. It is recommended that the collar be inspected at each seasonal maintenance, paying special attention to cracks, galvanic corrosion or loss of tightening tension. Replacing the collar preventively if there is any sign of deterioration prevents serious breakdowns in the propulsion system that can be costly and dangerous at sea.

Compatibility