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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Should I be worried if the crankshaft of an os91z is not true by .003
02-09-2006 07:02 PM  12 years agoPost 1
patriot21

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Byron,MN

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just wondering as we measured the crankshaft of a new 0s91z and it is not true by 3 thousandths.. will that pose a problem

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02-09-2006 07:22 PM  12 years agoPost 2
Coloradoheli3d

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Colorado USA

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Yeah it could, were did you measure it? By the bearing or at the end for the shaft?

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02-09-2006 07:49 PM  12 years agoPost 3
patriot21

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Byron,MN

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byt the end of the shaft...

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02-09-2006 08:53 PM  12 years agoPost 4
whirlyspud

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USA

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Are you saying that the needle on the gauge moves .003 in a rotation of the motor, or that the runout is .003?

Mike

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02-09-2006 08:55 PM  12 years agoPost 5
Coloradoheli3d

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Colorado USA

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If you measure at the end of the shaft you need to make sure that you don't measure the threads, put your indacator in the center hole used for grinding that might give you a better answer.

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02-10-2006 05:00 AM  12 years agoPost 6
Agilefalcon

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Fort Worth, Texas

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If you are measuring runout on the crank while it's in the engine, this won't be valid. The engine tolerances are set when the engine is at running temperature. I'm sure what you are seeing is the play in the bearings.

Cheers,

Chris Berardi
Team BobbyJack's Hobbies

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