How much play should there be in a cutlass bearing?
One or two mm of play.
How is a cutlass bearing lubricated?
To avoid water pollution, these bearings are generally lubricated by the surrounding water, removing the need for a rear seal. Such bearings, commonly referred to as Cutlass bearings, usually have an inner grooved nitrile rubber lining.
What is shaft wear?
Shaft Wear and Damage Shafts are a critical component of rotating equipment. Shafts are usually operated in immersed or semi-immersed conditions and are subject to damage by corrosion or chemical attack. In the mining industry, shafts can become worn or damaged due to vibration, friction and abrasive media.
How long does a cutlass bearing last?
We generally keep our boats 10-14 years and have never had a cutlass bearing fail. Keep your props tuned, don’t strike submerged objects, and they will last a long time.
How much play should be in a propeller?
50 ft./lbs is probably about right. (Nut doesn’t need alot of torque, as you want to be able to remove the prop, from time to time.) Forward motion, the prop wants push itself up the shaft. Reverse, the prop wants to pull off the shaft.
What is a Marine cutlass bearing?
Your Johnson Cutless Bearing (also known as “cutlass” bearing) is a fluted rubber tube that holds your propeller shaft in place, and keeps it spinning smoothly.
What is cutless bearing?
Cutless bearings refer to rubber lined bearings operating with water lubrication on an elasto-hydrodynamic principle. The name cutless is derived from the ability of such bearings to pass abrasive materials such as sand and marine organisms across its surface and into the flushing grooves.
What is a repair sleeve?
A shaft repair sleeve is a very thin metal sleeve that can be inserted onto a worn or damaged shaft as a quick and cost-effective alternative to repairing the shaft.
How tight should prop nut be?
Proper installation begins by installing the half nut first and tightening it just snug enough to “preload” the half nut onto the shaft against the prop hub. Tight but not with all your weight on it. Then the thick nut goes onto the shaft. The two nuts will not come off due to vibration or engine use.
How are Cutlass bearings fitted to the shaft?
Cutlass Bearing diameters are precision fitted to the designated shaft size with the correct clearance for efficient water lubrication. The external brass shells are machined and polished to provide easy fitting.
What kind of material is a Cutless bearing made of?
The Cutless bearing is usually made from a hard, rubberlike substance known as nitrile. Longitudinal flutes or valleys in the rubber tube are designed to improve water flow and to flush away any grit or other hard material that might wear on the shaft.
When to know it’s time for a new bearing?
Here are 3 signs it’s time for a new cutless bearing: 1.) You hear rumbling or vibration that slowly increases over time. 2.) If the shaft is centered in and parallel with the bearing, any movement in the shaft when it’s lifted indicates wear. (Note: An improperly aligned shaft could bind, masking the wear.) 3.)
Where do you find the Cutless bearing on a boat?
This bearing can be found, depending on the boat’s design, either within a shaft log that passes through the hull or in a strut some distance from the keel. The Cutless bearing is usually made from a hard, rubberlike substance known as nitrile.