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Allis Chalmers Discussion Forum
:

7080 counterbalanced crankshaft

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jim_from_uny

03-11-2011 16:46:31




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ac literature states that 7080 motor crankshaft is counterbalanced. when i look at service manual and parts manual i see no mention of this. i was expecting a gear running against crank. what does ac counterbalance mean ? got pics on agcoparts book




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Huey2

03-11-2011 18:25:53




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 Re: 7080 counterbalanced crankshaft in reply to jim_from_uny, 03-11-2011 16:46:31  
the counter balance on the allis 7080 is on the lower crankshaft pulley. you do have to inspect them once a year to make sure they are not coming apart. this can be seen by look at the pulley and if there is a rubber ring coming out the front of the pulley. it is starting to fail. if not fixed you will notice a vibration coming from the front of the engine. this some times has been linked to the crankshaft breaking. it is a good idea to check this out.

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Bob

03-11-2011 19:41:20




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 Re: 7080 counterbalanced crankshaft in reply to Huey2, 03-11-2011 18:25:53  
Let's call that a "torsional damper" or "vibration damper" rather than a "counter balance", which is it NOT!



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Bob

03-11-2011 17:22:55




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 Re: 7080 counterbalanced crankshaft in reply to jim_from_uny, 03-11-2011 16:46:31  
In-line sixes don't need a balance shaft/gear setup.

The weights in question are the weights opposite each crank throw.



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