COLLARIN EJE USA 1" (MG)

Function and technical context

The shaft collar is an axial retention and positioning element that works directly on the tail shaft or transmission shaft of the boat, keeping it correctly aligned and avoiding unwanted longitudinal displacements during navigation. It is part of the mechanical transmission system between the engine and the propeller, being a piece subjected to continuous axial and radial loads generated by the thrust of the propeller and the vibrations inherent to running. Its correct installation is essential to preserve the integrity of the stern tube bearing, the stuffing box or mechanical seal and the drive shaft itself. A damaged collar or one with excessive play can cause abnormal vibrations in the drive train, premature wear of adjacent elements and even the entry of water into the hull through the shaft sealing system. This reference REC9138MG corresponds to the USA measurement standard of 1 inch shaft diameter, widely used in propulsion installations of North American origin.

When to replace this part?

The most common symptoms that indicate that the shaft collar needs to be checked or replaced are: noticeable vibration in the tail shaft even at low rpm, metallic or knocking noises coming from the horn area, and visible axial movement of the shaft when manually pushing and pulling it with the engine stopped. It is recommended to inspect the collar at each annual beaching or each time the transmission system is inspected; If signs of wear, galvanic corrosion, deformation or loss of fit are seen, replacement must be immediate. Replacing this component preventively during seasonal maintenance is significantly more economical than facing a breakdown during navigation that could compromise the watertightness of the hull or render the propeller shaft unusable.

Compatibility table