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Don, Luling LA
01-24-2002 21:42:07
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Re: no compression in reply to mike (oh) , 01-24-2002 17:35:07
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The bent valve or stuck valve scenerio would be the most likely since something caused that pushrod to get bent in the first place. Acutally when did it get bent, was it during normal operation after some engine work, where the valves were adjusted? Was the tractor not run for a long time or did it just bend when it was running no engine work done in a while? Or was the tractor sitting up for a very long period and then started and sounded like it was running on 3 cylinders.
No matter what you will have to remove the valve cover and take a look at the valve in question. First make sure you have the correct valve lash. If the valve is stuck it will be more difficult to determine if the lash is correct. But if it was stuck when you replaced the push rod and you set it with it unseated you can jam the valve against the piston and bend it.
Compare it to the other valves of the same type, intake or exhaust which ever it is, insure the valve you are comparing it to is in the complete closed position. You can check by seeing if the rocker is loose in the top of one of the other valves, may have to rotate the engine to get it closed. Or, you can turn out on the rocker adjusting nut from the similar valve you want to compare to. Make your comparision, if the suspect valve is open alot it will be obvious that it's sitting lower than the other valve. If it's just slightly unseated that will be more difficult. Either way it sounds like you might need to remove your cylinder head, unless it's a stuck valve that you can free up from the top of the head. If it's a stuck valve it's pretty stuck to have bent the pushrod. I have heard some of the folks on the N-board use Marvel Mystery Oil, but they have, in block valves, not over head valves and can get more penatration into the valve guide and valve, with the oil. Pur it on and let it sit for a few days and then you can work the valve up and down if it moves at all, until it's loose. Don't use a hammer on the valve head use something that won't damage the end of the valve and you can hit that with a hammer. Keep on tapping it and let it return until you get it loose, if that happens at all. Good luck
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