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Allis Chalmers Discussion Forum

WD Bent Crank

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Jeff Jr.

05-23-2008 09:36:33

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I had lots of trouble with the WD the other day. The governor came apart on me and the tractor reved up way, way too high. I hit the kill switch and about three seconds later the motor locked up. Later I turned the crankshaft backwords and now its loose again. It does run but it vibrates terrible, barely has oil pressure & the dipstick is glittery. Is it possible a piece of the governor wedged between the timing gears and bent the crankshaft?

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05-26-2008 16:55:25

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 Re: WD Bent Crank in reply to Jeff Jr., 05-23-2008 09:36:33  
These engines are tough. Back in my pulling days we used put a wire around the goveror spring (disableing the governor) and run crazy high rpms. While I've grown up and treat my tractors better nowdays, we never did do any engine damage.

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05-23-2008 14:04:26

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 Re: WD Bent Crank in reply to Jeff Jr., 05-23-2008 09:36:33  
Not likely that the crank bent. But with the gov. coming apart what may have happened is parts of it got into the cam gears and that locked it up and in doing so may have sheared a key or pin on the crank or cam and that would make it run ruff/odd and maybe shake a lot because of being out of time

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Howard H.

05-23-2008 11:13:32

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 Re: WD Bent Crank in reply to Jeff Jr., 05-23-2008 09:36:33  

I'd guess it spun a bearing - main or rod - and now the crank is causing the vibration.

The glitter is not good... You're going to have to tear it down, anyway, to see what that is all about and if it got into the main beds or if it is just bearing powder...


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05-23-2008 09:52:27

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 Re: WD Bent Crank in reply to Jeff Jr., 05-23-2008 09:36:33  
youre crank probably is ok as for the cam gear crank gear and gov gear they probably have damage also youre cam shaft being hollow might have twisted some . i would check crankshaft straightness but i would doubt it was bent.

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