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Allis Chalmers Discussion Forum

Vibration in Engine

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Author  [Modern View]

08-12-2008 16:28:55

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My AC Model C has a rather significant vibration in the engine that gets worse as the RPM is picked up. I know there are a lot of things that can cause this, but has anyone had the misfortune to experience this? It runs great and has excellent oil pressure so I was thinking maybe the clutch, pressure plate or flywheel could be causing it. If it's a main bearing, I don't want to ruin a really good engine. Any thoughts would be appreciated.

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cadet trooper

08-13-2008 18:11:37

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 Re: Vibration in Engine in reply to davr101, 08-12-2008 16:28:55  
Just a thought here davr but did you just buy it or have you had it awhile? Maybe flywheel bolts are loose with that much vibration it's big.

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08-13-2008 18:42:06

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 Re: Vibration in Engine in reply to cadet trooper, 08-13-2008 18:11:37  
Cadet Trooper, I bought it about two months ago. It seems to be getting worse, so you may be right. I think I'll split the tractor and find out. Thanks for the great tip. I didn't think of that.


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08-13-2008 01:24:28

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 Re: Vibration in Engine in reply to davr101, 08-12-2008 16:28:55  
If something internally is causing the vibes it would be knocking or rattling. Something missing on the pressure plate sounds reasonable. Sounds crazy, but is the fan belt shaking? Generator shaking? Had a fan blade fly off a combine engine once and the whole machine vibed like crazy. Took awhile to find the problem because it was the last thing I expected. The missing blade did not touch the radiator and there were no marks on the combine. It just disappeared into oblivion.Jim

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08-13-2008 07:40:33

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 Re: Vibration in Engine in reply to fixerupper, 08-13-2008 01:24:28  
Thanks, Jim. I checked the fan and the front pulley. Both are good. I think you're right about it not being in the engine since there are no noises. The clutch group is suspect in my mind.


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