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John Deere Tractors Discussion Forum
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Re: 4020 coolant in oil after rebuild

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mmfarms

05-11-2020 07:43:01




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It seems to be dripping from around the cam near the number 5 cylinder. I dont think it can be a sleeve, as the drops are forming at the same height or above the bottom of sleeve. I had the rocker arm cover loose to re set the timing of the oil pump. And the gaskets at the bottom of the thermostat housing where it meets the head are leaking. I'm kind of wondering if coolant has gone from there into the rocker arm area and then run down the push rod holes into the pan.
I put some dye in the coolant, only to find the oil is also flourescent, unfortunately. I poured oil into the push rod holes and replaced the cover and gasket, and put the ool pan on loose as a catch basin. So far, 2 days later there's still water in the pan. So I'm starting to doubt the thermostat leaking theory, unless its still getting in there somehow. (Its still leaking, but I don't want to silicone them on if I have to rip them right back off, I don't have any more gaskets).

So I guess the head gasket is probably leaking into the push rod cavity.

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