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can somebody talk me through measuring bearing crush when assembling a motor/what measurement it should be and how to fix it if it's out?
cheers
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Buy some plastiguage. You put a piece between the bearing and the crank and torque up the cap. When you remove it compare the width it has squashed to, to a chart. This tells you the bearing clerance. Fix it? A crank grind and new bearings. |
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If we all had the same (good) taste, who would buy all the Fords? |
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Rank: Member
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so it's as simple as measuring bearing clearance? I vaguely remember reading an old article by Bob Kotmel about checking bearing crush as it was supposed to stop the bearing shells from spining. This was seperate to checking your clearances.
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Hi guys
Aren't we talking about 2 different things here...bearing crush and bearing clearance, with Plastigage used to check clearance.
I thought crush would be checked by snapping the big end shells into the rod and cap,place together and torque up the
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Rank: Member
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Thats the one I was after, so if the measurement is less than 0.1mm there's not enough crush right? What's the measurement for the mains?
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Yes, correct, the smaller the gap the less the crush.My info says expect to see 0.1mm as the desirable lower limit, and 0.025mm as unacceptable.
And for the mains 0.075 to 0.125mm.
If you can get one,grab a copy of How to Blueprint & Build for High Perf
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Rank: Veteran
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Correct. I misread your original post. |
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Rank: Member
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Thanks guys you've been a big help.
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