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STUMPED!!!

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Keith

06-20-2001 19:22:49




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I have just rebuilt a '35 A. The block has been been bored 45 over to take out the eggshape of the cylinders and new pistons and rings installed. Head has been reworked, valves reground and lapped in. The tractor misses at all rpm's on both cylinders. It will hit 5 to 7 times then miss the next 1 or 2. (No pattern that I can tell.) I have tried 3 new mags and that doesn't seem to fix it. Also tried 3 different carbs thinking that it might be a fuel problem, but that didn't make it run either. I have done several tractors and never had this problem before. Any suggestions? Could it be a govenor problem? Please help.
Thanks.

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BRIAN

06-23-2001 08:05:40




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 Re: STUMPED!!! in reply to Keith, 06-20-2001 19:22:49  
WHEN REDOING A TRACTOR AND GOING AS FAR AS YOU HAVE YOU NEED TO ALSO HAVE THE CAM SHAFT CHECKED AND GROUND THE TRACTOR IS VERY OLD THER HAS TO BE SOME WEAR ON IT.ONE OLD GUY TOLD ME IF YOU REDO EVERY THING BUT THE CAM YOU MIGHT AS WELL NOT BOTHER REDOING IT AT ALL BECAUSE IT WILL MORE THAN LIKELY NOT RUN RIGHT. ITS NOT TO EXPENSIVE EITHER. I HAD MINE DONE FOR AROUND 200 DOLLARS HOPE THIS HELPS



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Keith

06-23-2001 21:30:56




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 Re: Re: STUMPED!!! in reply to BRIAN, 06-23-2001 08:05:40  
Well, that makes sense. It's the only thing I haven't tried yet. Thanks for the help!



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WTW

06-21-2001 11:22:54




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 Re: STUMPED!!! in reply to Keith, 06-20-2001 19:22:49  
Keith, I have been where you are and can share your frustration. I would check that the manifold to head joint is good and not sucking air in between them. If you had these surfaced planned when the head was reconditioned that probably is not your problem either. Here is what I would check next and I have seen this happen several times on A's. Pull the cam bearing cap from the left side of the engine right above the flywheel circle about 11 O-clock and see if the cam bearing has failed. You may find that the tapered roller bearing will fall apart as soon as you remove the cap. If this bearing appears OK then remove the engine cover and reach around inside and see if the other is in tack. What happens is when the cam bearings fail is the cam will move up and down back and fourth and throw your valve lift and timing all over. An old hit and miss will sound better than you old A with this problem. If this is your problem there will be a little work involved to replace these bearings but a least you will know what your problem is. Good Luck Dave W.

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George S. in NY

06-20-2001 20:39:11




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 Re: STUMPED!!! in reply to Keith, 06-20-2001 19:22:49  
OUCH!!! It is time like this that makes engine rebuilders want to throw away their tools and get into some other kind of work, say mowing lawns. To your problem. I doubt the govener is the cause. If it is bad, you will get uneven engine speed, i.e. "hunting" and the carb throttle plate will be moving when the throttle handle remains in one place. Enough carbs tried so that you should have seen some change. Here are some things to check. Make sure the rocker arms are set right. If ok, try doing an air leak test. With valves closed and using an adapter to put compressed air into a cylinder when that piston is at the bottom of the stroke, listen for air leak thru the spark plug hole of the other cylinder. Also, listen at carb opening and exhaust. This could indicate a crack in head or block OR a uneven block surface where the head meets it. The head has to be flat too. Did you check the top of the block when you had it apart?? More and more I am finding the top of blocks that are really wavey, with Rabbit Diesels at the top of the list. The other thing to check is that the intake manifold is not burned thru to the exhaust passage. I assume you had it off and put new gaskets on, otherwise, check that surface for flat. My JD H had a warped manifold and the intake sucked a little extra air that made it a real hassle to start. Check those two things and let me know, then have to think harder... Good luck, George S.

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