Posted by Owen Aaland on May 19, 2016 at 14:18:35 from (199.96.227.1):
In Reply to: WATER IN OIL posted by doubledollar on May 17, 2016 at 18:51:58:
A bad oil cooler will almost always put oil into the cooling system before coolant gets into the oil. With the engine running you will have 40 - 60 psi of oil pressure working against 15 psi in the cooling system. With the engine of the pressures reverse. You will now have 15 psi in the cooling system and nothing in the oil side. Coolant can then enter the lube system.
Those engines use three O-rings on the bottom of the sleeves. Only the top one seals between the crankcase and the cooling system. The lower two serve to locate the sleeve in the engine block. The top O-ring groove in the sleeve is not as deep as the other two. The top O-ring seals against the chamfer at the top of the lower cylinder bore. If that sealing surface has suffered any erosion the O-ring will have problems keeping a good seal. Because the bottom of the sleeve is located by the two lower O-rings it can move around a tiny bit but that little bit of movement is enough to keep cooling system sealants from working very well.
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