Rebuilding 258 CID I6, 87 Wrangler; looking for lessons learned:
Rebuilding my 258; 1987 engine has 160,000 miles on it, never rebuilt, and mine since it was new: I have the traditional Haynes manual, and a limited experience rebuilding e.g., done one engine, 289 Ford in a 66 Mustang. I am wondering if any of you can provide any valuable lessons learned about the stuff not in the Haynes.
I am starting with a top end (Head), and also probably the timing chain, timing chain sprockets and a front oil seal, and stopping there for the winter. This engine is really a leaker.
This spring I will pull the engine and take care of the block. I just got done replacing the oil pump. I still have to do the normal compression checks, but a top-end is looking inevitable due to a temperature problem.
I have a hot engine problem I am chasing. I have replaced the radiator (looked really bad inside), thermostat, and now the oil pump trying to cool it down (oil pressure was very low, about 10 - 20 psi at idle and I wanted to be sure at minimum I was getting oil to the crankcase and to pick up the oil pressure a bit); I figured the low oil pressure was from a bad pump. I put in a 185 degree F thermostat. Engine runs at about 210 - 220 degrees F. Seems too warm to me. When I pulled the oil pan, there was the infamous white film in the pan. I know that indacates, water in the oil from probably a head gasket, or worst case a cracked cylinder wall, or a cracked or warped head. I was hoping the white film was just from condensation, but since the new oil pump did not improve the tempreature significantly I am moving on to the head. I am pulling the cylinder head to inspect, and while I am there doing the top-end.
Also, I have completely and properly rerouted all the ancillary vacuum and air lines that through the years were anything but routed properly.
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