John Deere M white smoke ??

FarmallRay · May 9, 2019

My M starts and runs excellent. Doesn?t smoke at all while at idle or when under load. But when I back off the throttle. For example on a road ride and back off the throttle or down a hill where the engine is holding it back , I get a lot of white smoke. Doesn?t seem to use oil. What causes this.
Thanks in advance

Mike Groom · May 9, 2019

White smoke is usually an indication of valve guides being worn,most the time it occurs on start-up in the case of older cars,the other possibility is a slight head gasket leak and you're getting a little water in the exhaust.Any oil film in the radiator?

FarmallRay · May 9, 2019

No , anti freeze is clean. Doesn?t do it at idle or start up or while it?s under a load. Just when you back off the throttle coming down the hill

MSM · May 9, 2019

You have closed the throttle plate but the engine is still up in rpm and drawing a strong vacuum. It is drawing oil from the valve guides. One other posibility the top of the head is sludged up and not returning rocker arm oil back to the crankcase and it puddles up and is drawn in

M-MAN · May 9, 2019

I would be looking at the oil bath. Most likely water in there making it overfull. 30 wt oil works best.

John Deere M white smoke ??

FarmallRay

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Mike Groom

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FarmallRay

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MSM

Well-known Member

M-MAN

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