Crankshaft preload- how much

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Per Garbos
Diana
Posts: 55
Joined: Sat Feb 03, 2007 11:41 am
Location: Denmark

Crankshaft preload- how much

Post by Per Garbos »

I sat the endfloat to nil and no preload for about 10.000 km ago at my crankshaft, but now there seems to be a little endfloat.
Using a dial indikator I can measure around 0,01-0,02mm.
Is that acceptable or should i do something about it ?

Best regards Per
BEVEL DAVE
Diana
Posts: 62
Joined: Sat Jun 13, 2009 7:22 pm
Location: SYDNEY, AUSTRALIA

Post by BEVEL DAVE »

They need some preload, more feel than measurement though.
Per Garbos
Diana
Posts: 55
Joined: Sat Feb 03, 2007 11:41 am
Location: Denmark

Post by Per Garbos »

Thanks, i will give the crankshaft a little preload.
wdietz186
Cagiva Alazzura
Posts: 707
Joined: Sun Sep 10, 2006 5:40 pm

Post by wdietz186 »

I try to shoot for about .004" or a slight drag on the crank when turned.It will fall slowly and smoothly when the counterweights are about 90deg. from vertical.As Dave said it is kind of a feel operation.
machten
MHR / S2
Posts: 478
Joined: Sun Oct 29, 2006 8:37 am
Location: Perth, Western Australia

Post by machten »

It will fall slowly and smoothly when the counterweights are about 90deg. from vertical
That's the ultimate test I use too.

Kev
Lumpy
SD900 Darmah
Posts: 329
Joined: Sun Mar 25, 2007 5:49 am

preload

Post by Lumpy »

I set one once to what I calculated as zero and after about 15,000 k`s it developed endfloat again. The next one I did I aimed for .002" preload and that has been fine.
Per Garbos
Diana
Posts: 55
Joined: Sat Feb 03, 2007 11:41 am
Location: Denmark

Post by Per Garbos »

Thanks for the advises,

Then i think i will adjust the preload to 0,03 -0,05 mm and thereafter check that the crankshaft can rotate by its own weight as described.
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