Re: Re: Re: Hot Engine

Posted by john d on August 12, 2001 at 20:12:44 from (152.163.197.178):

In Reply to: Re: Re: Hot Engine posted by Wayne Fusselman on August 12, 2001 at 18:40:27:

At least two factors may be in play here. As the engine gets hotter, the oil gets thinner, and the pressure will drop. Secondly, as the engine gets hotter, all the clearances in the engine tend to open up a little, and the oil pressure will drop.

I'd suggest your first step should be to make certain your cooling system is working properly, by checking the tension on the fan belt and looking for crud in the radiator fins that will block air flow. The temperature gauge may say things are okay, but as these old tractors get older, those gauges often become less accurate.

If the engine temperature is truly okay, you may be headed for some problems. You mentioned smoke... black smoke is generally un-burned fuel; smoke with a little bluish tint is oil. Even though it's running well, if the engine is putting out oil smoke, that's a clue that the rings are nearing the end of their life, and you can bet the rest of the engine is getting a little loose also. It won't make a new engine out of a tired one, but sometimes changing the oil to a heavier SAE # will help. The recommended oil is SAE 30. SAE 40 will be a little heavier when warm, and will likely result in a little more oil pressure.

Now I know there are some guys on this board that will have some sort of spasm at this suggestion, but here goes..... In spite of the fact that multi-grade oil (10W-30 for example) is not usually a good idea in these engines except when starting them in extremely cold weather, you could do worse than changing your oil to 20W-50. If the engine's losing oil pressure when hot, that should help, and it won't hurt a thing.

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• Re: Re: Re: Re: Hot Engine Wayne Fusselman 05:04:05 08/13/01 (0)

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