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John Deere Tractors Discussion Forum
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Rebuilt G Ain't Runnin Right - Help

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John

10-06-2003 14:50:20




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I have just had a '52 G rebuilt to include bored block, new gas aluminum pistons with new rings, head redone to include valve job/port and polish intake and exhaust ports/deck .125 inch. Problem is that when running it is evident that the #2 cylinder has low compression - you can hear it in the exhaust and by opening the compression relief valve on #2 while running (amount of gases escaping are very low when compared to #1 side). One strange thing that I have noticed is that with the compression relief open on #2, I can pull the magneto wire on #1 and feel a big pick up in compression by feeling the amount of gases escaping through the #2 relief valve. Does this sound like a valve problem? I did have the #2 exhaust valve to stick open just after rebuild. The engine probably has less than 1 hour running time. Compression at cranking speed is 70 pounds on both cylinders. Any ideas.

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Roger

10-06-2003 16:21:22




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 Re: Rebuilt G Ain't Runnin Right - Help in reply to John, 10-06-2003 14:50:20  
John, I have a '51 G, it does the same thing when just sitting there running, put a good load on it THEN see if #2 cylinder will hit as hard as # 1. I'll bet it will.....Roger



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G-MAN

10-06-2003 15:54:42




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 Re: Rebuilt G Ain't Runnin Right - Help in reply to John, 10-06-2003 14:50:20  
Is what you're feeling actually low compression, or just the normal operation of a single-barrel-carbureted two-cylinder? You see, the two cylinders have their respective intake strokes only 180 crankshaft degrees apart. At low engine speeds, when there is a relatively low volume of air coming through the carb, it's fairly normal and common for the #1 cylinder to get a richer fuel-air charge than the #2 cylinder, which can sometimes result in #2 actually missing a little bit or not hitting as hard as #1. When the engine speed gets up some, and there is much more air flowing in, the #2 hole gets a much better fuel-air charge, and the engine will smooth out quite a bit. However, since you mention a stuck valve, I would probably investigate that. Maybe pull the valve cover and watch the operation of the valves on #2. Perhaps it's continuing to hang open a little bit. You could also check valve lash and make sure it's set correctly. If your rocker shaft and arms have some wear, it can be nearly impossible to accurately set valve lash, on any engine.

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