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Old 11-07-2014, 09:40 AM   #1 (permalink)
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oil in the coolant?

Ok i have had water in my oil before from blown head gaskets. But yesterday i went to check my coolant level and found a little oil in the expansion tank. 3.9 1994 rrc runs fine doesn't get hot or lose coolant or oil. Also no water in the oil. What might cause oil in the coolant? I was thinking a crack in the radiator between the oil cooler and the radiator maybe. Any ideas?
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Old 11-08-2014, 07:14 PM   #2 (permalink)
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Check compression and then try a vacuum test on the cooling system.
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Old 11-09-2014, 06:57 AM   #3 (permalink)
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Very, very, very rare to have such issues in an early NAS V8.

Look for an issue with the timing cover gasket.

There are no coolant passages near oil passages to the heads thus if it is due to overheating, it's BAD.
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Old 11-09-2014, 09:33 AM   #4 (permalink)
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it does not over heat and has not over heated. so its most likely not a radiator oil cooler problem then? think ill drain the coolant and flush the system see if it happens again. so the timing cover can cause oil to get into the water then?
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Old 11-20-2014, 06:58 PM   #5 (permalink)
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Radiator is easy enough to remove on that truck. Take it to a radiator shop and have them pressure test it.
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Old 11-24-2014, 04:56 AM   #6 (permalink)
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Ease of radiator removal depends upon where the OP is. Around here, trying to remove the cooler lines can result in having to replace cooler lines and the rad.

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Old 11-28-2014, 03:34 PM   #7 (permalink)
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X2 on the timing cover. Had that same issue on a 99 DII. Thought it was the heads at first.
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