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Case Tractors Discussion Forum

300 distributor problem!!

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Daveminn

08-07-2007 17:15:45

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My 300 case tractor has been shearing the pin that goes through the distributor gear that drives it ,3 times now.I use it about 20 hrs after replacing it and that pin breaks getting it out of time.Anyone know what the problem could be??Dave Ahlgren, Thanks for any help!!

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Bruce Nelson

08-07-2007 18:23:59

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Re: 300 distributor problem!! in reply to Daveminn, 08-07-2007 17:15:45

This happened to me on a VAC. I think the distributors are nearly identical. On mine, the camshaft had come loose in the cam gear. The woodruff key also became worn and very loose. This allowed the cam to change positions in the gear as the motor turned. When the cam would open a valve, it would retard some, and when a valve would close, valve spring pressure would push on the tappet and cam lobe forcing the cam to lurch ahead a little bit. This means that as the cam rotated, the cam was constantly jerking from a retarded position to an advanced position. If you feel the distributor while the engine is running, you may find that is is shaking almost violently. This jerking motion of the camshaft is transmitted right to the distributor and that is too much for the gear pin to handle and it breaks. Bruce

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wayne2

08-07-2007 20:59:30

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Re: 300 distributor problem!! in reply to Bruce Nelson, 08-07-2007 18:23:59

I helped tear the cam gear and cam out of 320 b-hoe-Dist had flown apart ps I write dumb checks!!! LOL Wayne

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