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JONH DEERE A NOCK IN MOTOR

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chot

03-31-2003 09:55:51




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THEY SAID IT WAS REBUIT 2 YEARS AGO NOT RUN MUCH WHAT WOOD IT BE IT RUNS GOOD BUT NOCKS




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Dave K

04-03-2003 19:42:41




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 Re: JONH DEERE A NOCK IN MOTOR in reply to chot, 03-31-2003 09:55:51  
Mine started that, was a loose drive gear on the cam shaft, accessable through the crankcase cover.

Dave



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jeff

03-31-2003 19:15:11




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 Re: JONH DEERE A NOCK IN MOTOR in reply to chot, 03-31-2003 09:55:51  
Mine knocked. It was the rod bearing.



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Clooney

03-31-2003 13:44:23




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 Re: JONH DEERE A NOCK IN MOTOR in reply to chot, 03-31-2003 09:55:51  
Chot, Frank pretty well covered it. You might also have a loose clutch driver inside the clutch pulley.
~Can you give us any more details on the knock....Hot or Cold, or both?...Under load or not under load, or both?...Once per revolution or once every other revolution?...Clutch engaged or not engaged?...Does shorting out either spark plug change the knock?...Is it louder on either side or anywhere in particular?

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F-I-T

03-31-2003 10:45:18




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 Re: JONH DEERE A NOCK IN MOTOR in reply to chot, 03-31-2003 09:55:51  
Chot:

Could be anything from loose flywheel/rods/mains/wrist pins/governor or even timing.

Easiest place to check first are the rod bearings. Check the rod caps for proper clearance and torque. They make a heck of a racket if a rod cap is loose.

Check crankshaft endplay. .005-010" is called for. Then check that the flywheel bolts are tight. Can't tell you the torque, but it's considerable. Don't over do it, or those bolts can stretch. A new pair of grade 8 bolts is never a waste of money.

Someone can fill in the gaps that I missed.

Frank-in-Tallahassee
70D // 855

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