ok this is going to be a long post but please bear with me because im lost and need help from someone that knows these engines
1986 nissan 720 king cab 2.4 motor 5 speed 4x4 130,000 miles
i bought the truck with it pushing oil into the radiator pretty bad, pulled it all apart and found that the head bolts where not very tight, then found that someone installed the head gasket cocked and literly took a hammer and beat the head bolts through the gasket.
what i have done so far
i had the head all worked over, milled flat, valve job, pressure tested... done....
checked the deck of the block with a machinest straight edge, and its with in tolerence according to my machine shop...
new oil pump installed
at this point i put the motor all back together, started it, still doing the same thing, i figured from what i found tearing it down that someone worked on it that didnt know what they where doing and i figured a head job and proper headgasket install would fix this problem, i mean the truck runs fine except its pushing oil into the rad.
so i tore it back down again and really started digging.
i have small hairline cracks in the front cover on the inside from where someone over torqued the water pump, i cleaned the inside like crazy, they do not come all the way through
i have a very very small hairline crack betweeen cylinder 3 valves in the head, (passed pressure test)
i have looked all over the oil passage way between block and head, no signs of cracking or abnormal passage. then i got to thinking if that reducer in that hole is supposed to be sticking up out of the block and go into the head a little bit, tried that theory, fail with the dowel alighment pins in the block and that sticking up, everything does not line up...
ive dug all over google cant find crap on this. id really like to save this truck i think its cool, but im out of ideas..... any help and thanks in advance.
is wrong with this thing.