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BHT
07-20-2008, 02:28 AM
Does anyone know the maximum run out tolerance for a propeller shaft? My propeller had an encounter with a tree limb and requires a little repair and re-balance. Thought I'd better check the propeller shaft run out so I put my dial indicator and came up with these numbers. The dial indicator is metric so I hope my conversions are accurate.

A - .05 mm or .002 inch
B - .05 mm or .002 inch (small tapered part of the shaft)
C - .01 mm or .0004 inch

Seems like .002 of an inch would be within limits.

bigmac
07-20-2008, 08:11 AM
.002 is within tolerance, but I'd also run out mid-shaft - especially since there's a difference between A and C.

BHT
07-20-2008, 09:57 AM
Good idea, thanks.

jimmer2880
07-20-2008, 07:08 PM
Can I ask a dumb question?

How did you measure that? I'd love to know how I could check mine.

bigmac
07-20-2008, 07:26 PM
Can I ask a dumb question?

How did you measure that? I'd love to know how I could check mine.He used a dial indicator.

http://www.amazon.com/Grizzly-H3022-Magnetic-Indicator-Caliper/dp/B0000DD4GB

Storm861triple
07-20-2008, 11:55 PM
That you have MORE run out closer to the bearing point tells me that there is either a problem w/the accuracy of your measuring method, OR that the shaft is self isn't perfect. My vote would go toward #2.

But I also agree w/bigmac, that you should check mid shaft. IIRC, the spec there is .003", but that may not be right, as it's been a loooong time since I checked one.