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Tractor Talk Discussion Forum

Engine compression question ...

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Alberta Mike

09-23-2005 07:08:55




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Picked up a little MH 20 yesterday, nice little tractor but like all of them it needs work. The engine runs OK (after a ton of tinkering) and has good compression (100-110 in the four cylinder flathead) but I suspect it is blowing a bit of oil, especially when you gun the throttle, but there seems to be black smoke there too so maybe it's running rich. My question is, if the compression seems OK, is it still likely to need a set of rings (and a valve job)?

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J. Schwiebert

09-23-2005 16:46:29




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 Re: Engine compression question ... in reply to Alberta Mike, 09-23-2005 07:08:55  
Mike, If you have a vacuum gauge it would be a good thing to use to check engine conditions. Also a leakdown test would be O. K. harder to do on a flathead though. Send me an e-mail if you want to.



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buickanddeere

09-23-2005 08:28:40




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 Re: Engine compression question ... in reply to Alberta Mike, 09-23-2005 07:08:55  
The puff of smoke upon acceleration is likely an over rich mixture. At idle and slow speeds particularly with a cold log style manifold. Droplets of fuel will stick to the side and top of the manifold plus form puddles on the bottom. When the velocity and mass of the flowing air increases. These droplets of fuel are swept into the combustion chambers causing a momentary over rich situation. This is one of the reasons why auto manufactures went to port fuel injection/dry intake manifolds. The engine idle mixture should not be set for the smoothest idle. Rather as lean as the engine will still idle without missing or hunting.

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Dan

09-23-2005 07:33:42




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 Re: Engine compression question ... in reply to Alberta Mike, 09-23-2005 07:08:55  
You may fix quite a bit of the smoke with adjusting the carb. I would remove the spark plugs and pour some Marvels Mystery Oil down the cylinders. You could have stuck rings and this will help. You may want to do this for a few days if you can. You can have good compression rings but bad oil control rings - this would show good compression on a tester but burn oil. Make sure to spin your engine a few seconds before you put the spark plugs back in to make sure enough of the oil is out of the cylinders to prevent hydraulic lock when you try to start it.

Good luck,
Dan

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Mike M

09-23-2005 07:20:45




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 Re: Engine compression question ... in reply to Alberta Mike, 09-23-2005 07:08:55  
With black smoke (rich)you should be able to clean it up with a good tune up and carb. repair.



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