Oil pressure problem solved

trainguy

trainguy

Well-known member
In a previous thread I have a newly rebuilt 3-5/16x4 1/8 59ab.That initally showed about 20# OP I foud that the front relief valve was missing:mad: thinking that my problem was solved I temperarly installed a mechanical oil press gage and tried again.This time it showed 35#run 10# idle.Still I felt with a Melling HV pump it should be better.I removed the front cover and timing gear.You guessed it the machine shop forgot the front galley plug.I am amazed that it developed 35# OP with the relilief valve and front plug missing.Am curious as to what the oil pressure will be with all the parts installed.Phil:confused:
 
Goes to show perseverance rules.Good trouble shooting Train dude. High volume and high pressure are two different cats. Usually hv. pumps have taller gears to give volume.Hp pumps use a stiffer bypass spring to help with the pressure increase. You can shim some pump springs to achieve the same thing. Good to see you waded through this one with success.
 
Yes you can . It all depends what you perceive to be high pressure. You will probably be ok.
 
flatjack is correct about to much oil pressure, me and my partner set up a chevy race engine with a high pressure relief valve, it hit #100 thinking thats great we ran it, on the first oil change after the first race nite we found pieces of metal, babbit from the rods, in the oil, pulled the rod bearings and every one wos worm hole tracted, to much pressere had forced the oil to cut the groves in the bearings, so to much of a good thig can be bad
 
Another thing you can do is drill a hole in the front galley plug for oil to blow onto the back of the timing gear. Can't remember the size, but someone can recommend here. I stole this idea from one of Mike Davidson's books. Did it on my 8ba and she shows 48#'s when cold and holds 22 at idle when warm.
 
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