SHORT COLLAR 1 SHAFT

Function and technical context

The 1-inch short shaft collar is an axial positioning and fastening element that works directly on the boat's drive shaft, ensuring that it maintains its correct longitudinal position within the drive assembly. Its main function is to retain the shaft and prevent unwanted axial displacements that would compromise the alignment between the engine, coupling and propeller. As part of the transmission system, its integrity is critical: a worn or poorly adjusted collar can cause excessive vibrations, accelerated wear of shaft seals and bearings, and even loss of control over propeller thrust. The reference TEN00503L corresponds to the short version for 1 inch diameter shafts, it being essential to select the exact size to ensure a secure and play-free fit.

When to replace this part?

The most common symptoms of a deteriorated shaft collar include abnormal vibrations noticeable in the hull or control lever, metallic noises coming from the shaft tunnel, and premature wear or leaks in the stuffing box or adjacent mechanical seal. It is recommended to inspect the shaft collar during each seasonal maintenance, paying special attention to signs of galvanic corrosion, cracks or excessive play in the fixation using the set screw or keyway. Replacing this component preventively when any visible looseness or corrosion is detected prevents major breakdowns in the propulsion system that can leave the boat immobilized at sea.