Thread: 7.5 professional rebuild 15K miles no oil pressure at hot idle

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I changed the oil first No issues with it or the filter. If it wiped the cam there would have to be valve noise? I just went to the Shell Rotella face book and ask the question. I'll report back when and IF they reply.

Originally Posted by twolaneblacktop

I changed the oil first No issues with it or the filter. If it wiped the cam there would have to be valve noise? I just went to the Shell Rotella face book and ask the question. I'll report back when and IF they reply.

Again, don't jump to conclusions. If it's the oil pump, pull the pan and fix it. BUT, drain the oil again first and cut the filter open to see if any particles are there...

if your getting a 0 reading with the mechanical then i think 36 sedan is right. it is in the oil pump. can it idle for an extended time with no oiling issues ?

Ive also heard that newer synthetic oils are not good in older designed motors as it is too slick and thin for their bearing designs and doesn't hold oil pressure well in them.

no synthetic here. I made that mistake before. Flat tappet engines do not do well with that stuff even after break in. I think that is what happened to the Ford replacement engine that was in the truck when I bought it.

Originally Posted by twolaneblacktop

Changed sending unit and oil/filter. Still 0 PSI at hot idle. Checked with a mechanical gage 0 PSI at hot idle.

Already done.

Hello all,
I have been ill so my Ford fun sat in the parking lot for about a year before I could deal with it again. I took it back to the guys who built the engine. They found that it had pushed a lifter out of the lifter bore, hence no oil PSI at idle. This was so odd because there was no noise. It was down on power, but I did not drive it since the oil PSI issue was found. After a new cam and lifters it pulled a rocker stud that afternoon. Back to the engine builder. Another great Ford idea is not to thread the rocker studs but to pin them in place. This time it also pushed a lifter out of the bore. They replaced all the rocker studs and so far we are good to go! Just told my son, NO MORE FORD BIG BLOCKS! Lesson learned. If you ever do a Ford big block, and use the stock heads, make the replacement of the rocker studs a must!