11/7/2023 0 Comments Parts of an inboard boat motorOnly boats with inboard engines have stuffing boxes. If a stuffing box lets more than a few drips of water pass, it’s time for a closer look. Slight movement (say 1/16” or so) is borderline, but if visible shaft wiggle or an audible “thunk” occurs while shaking the prop, the bearing is definitely due for replacement. Next, simply grab the prop or shaft and give it a couple of good, firm shakes to detect shaft looseness within the bearing. top wear on one end of the bearing, bottom wear on the other) are indications of significant shaft misalignment issues and should be addressed immediately. To determine if a cutless bearing needs replacing, look for signs of wear or deterioration of the rubber at both ends of the bearing. Problems occur when the bearing lining (and grooves) wear down, which reduces the flow of cooling water and introduces looseness or play in the bearing. These groves allow water to enter the cutless bearing to keep everything cool and lubricated while the shaft rotates within. Cutless bearings are typically made of brass with an interior rubber lining that contains grooves running the length of the bearing. Cutless Bearingįirst off, it’s spelled cutless (not cutlass) but what exactly is it and what does it do? A cutless bearing supports the propeller shaft of a vessel, while allowing it to turn freely without damage. A worn cutless bearing results in a propshaft having play in it that can cause it to wobble.
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