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720D bent push rods

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Poor Farm Jim

07-06-2001 19:27:30




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I bought 2 720D parts tractors in the past couple months and the one is a pretty descent looking and complete tractor. In fact, from 100 feet it looks better than any of the other 2 cylinders I own. The fellow I bought it from said he thought the double idler gear that runs the governor and cam gear off the gear on the left side of the crankshaft was shelled out and it is. A buddy and I took these parts off the one parts tractor first and we should be fine that way. But we were wondering, and had our fears confirmed that there might be some valve train damage when the tractor went out of time. The 2 exhaust push rods are bent real well and the intakes seem to be just barely bent. We were wondering if the valves might be bent, too. We pushed in each one several times and let it snap back and we both agreed they sounded "right", that they made the right sound like they were seating properly. Don't want to take off the head if I don't have too. Anyone have an opinion about whether they think the valves might have bent, too? As a sidelight, it was obvious this tractor had been torn down before, and very obvious the governor hadn't been put back together properly, parts were laying on top of the crankcase when we pulled the governor housing off. Don't know how they ever made it work, maybe it over revved and caused the problems.

Jim

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Joel Williams

07-13-2001 10:45:11




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 Re: 720D bent push rods in reply to Poor Farm Jim, 07-06-2001 19:27:30  
You could take an injector off the parts tractor and make up a rig to blow air into the cylinders one at a time and listen to the exhaust and intake sides for escaping air. That would tell you if you have bad valves. Be careful when hooking the air up if you do this as the crank will rotate along with everything else. Good luck.



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Poor Farm Jim

07-15-2001 21:03:31




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 Re: Re: 720D bent push rods in reply to Joel Williams, 07-13-2001 10:45:11  
Good idea Joel, but my buddy and I went ahead and popped the head. When we took the keepers off we pushed the valves about half way out and then popped them back against the seats to see if they jumped back, I suppose there is a slang term for that. They were all still straight. But, since we already had the head off we took the head to his place and he ground the valves and dusted the seats. There was a little pitting on the valves that I attribute to dirt entering at the deteriorating and split intake hose. I could still see the hone marks in the cylinder walls. Think this might make a good tractor.
Jim

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Joel Williams

07-16-2001 13:51:40




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 Re: Re: Re: 720D bent push rods in reply to Poor Farm Jim, 07-15-2001 21:03:31  
Sounds good. You did it the right way, now you know what is inside. I always tend to err to the cautious and go into them so I will know for sure. The 730D I just bought I don't think is running as good as it should. Smokes black a little at idle. Think I'm going to pull the injectors and check timing and a few other things. Good luck and let me know how it runs if you get a chance. Joel



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Ralph

07-06-2001 21:23:39




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 Re: 720D bent push rods in reply to Poor Farm Jim, 07-06-2001 19:27:30  
From what you have said, I would check everything they took apart. I thought my V-4 starting engine was running pretty well. My mechanic consultant wanted to take it apart, "sharpen" the valves, hone the cylinders along with overhauling the power steering and pump. He was right the motor had been apart "recently" but the rear main was put in wrong, starving the bearing for oil. Crank had a crack in this region when magnafluxed(?). There are a lot more people with wrenches than there are mechanics or craftsmen.

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