thrust bearing installation

[stumblinh]

Wow, lots of bad information in this thread....

A thrust bearing does nothing if it does not transfer thrust from the prop to the hull. It does this ONLY if the bearing is pinched between the coupler and the motor under forward movement - otherwise the motor's endbell bearing is transferring all the thrust (usually not a bad thing at all). When set up correctly a thrust bearing will not be loaded when the motor isn't running, otherwise it will cause unwanted friction. If a motor shaft has axial run out - end play - measure the play and install the thrust bearing so that only half the end play remains. This will insure two things - that the bearing is actually taking thrust when the boat is moving, and that the thrust bearing is not adding friction by pinching the PTO bearing between the internal shims and the thrust bearing/coupler.

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You said nearly the same thing.. when there is no load you don't want a load on the thrust bearing.. otherwise it will cause unwanted friction :P If you have as much "play" as you are describing in your comment, I suggest re-shimming the motor, a lot of bad things can happen if you have too much play.

[ray schrauwen]

Gave up on thrust bearings when I went to Neu & Leo/ TP power motors. Never had a need. Tried one on a 1521 1.5 in df33 4s2p and could never get it shimmed right, loud as hell. Removed it and it ragn like a dream with less heat. To each their own though.