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Author	Topic:   Propeller Replaceable Hub Out of Round
tedious	posted 08-09-2010 11:06 PM ET (US)         I bought a new DE-500 hub kit to fit my Turbo propeller to my new motor, although I don't have the motor yet. I installed the hub ; it seemed to fit just fine in the square cavity on the prop. However, it visually looked a little off center. I measured as best I could--my dial caliper jaws were not quite deep enough--and came up with 8 or 10 thousandths difference from one side to the other. Is this a concern? Or nothing to worry about? Or within my measurement error? Really, really don't want to trash the gea rcase on my new motor with an out of round propeller. Tim
number9	posted 08-10-2010 02:07 AM ET (US)             Tim--If you have a fairly calibrated eye, probably best to send the hub back and contact the manufacturer to advise them of a possible defect. Visual out of round is difficult to see unless OCD. Bill
Mr T	posted 08-10-2010 02:28 AM ET (US)             Until it is mounted on the motor and checked I would not worry too much about this. The hub needs to get drawn into place when the main nut is torqued down.
tedious	posted 08-10-2010 07:09 AM ET (US)             It's a little hard to describe. This is a square cavity hub (square lock) with a brass insert in a urethane plug that fits into the cavity in the prop. The brass insert is about 1/16" higher than the main body of the urethane piece, and the urethane material extends above the main body, forming a thin collar around the brass insert. The collar is not uniformly round - that makes no difference, as it is not structural. It's the brass piece being centered in the actual prop that is important, and I can't tell if it's actually off center or it's just an optical illusion created by the non-uniform collar. Like I say, it's hard to measure. Tim
Tom W Clark	posted 08-10-2010 09:23 AM ET (US)             Tim, You have to measure propeller run out once it is mounted on the motor and has been run at least once.
tedious	posted 08-10-2010 06:04 PM ET (US)             Sure - but is there a rule of thumb that'll let me know if it's even worth trying, vs. just sending it back? Tim
number9	posted 08-10-2010 11:43 PM ET (US)             Tim, Looked at some Yamaha and Mercury service manuals and didn't see any specs for prop or shaft run-out tolerances. Bill
Hoosier	posted 08-11-2010 07:49 PM ET (US)             Just go out and run it. You said that it has a urethane collar, under load, that should take care of any intolerance's.
Tom W Clark	posted 08-11-2010 10:19 PM ET (US)             Tim, Mount the prop on the motor and rotate it by hand and see is there is a visible wobble. If there is, something is wrong. If there is not, run it and see, though it does NOT mean there is NOT a problem.
tedious	posted 08-12-2010 08:03 AM ET (US)             Thanks Tom - I will do that. I was able to get a better measurement last night, so I am less worried. It still LOOKS very out of round to me, but I am now convinced it's an optical illusion. Tim

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