Oil pump keeps failing
TECH Addict
Joined: Aug 2005
Posts: 2,305
Likes: 126
From: Monroe,NY
Did you put the pump on in one piece on the motor or did you take it apart and put it on body first then the gears? If you did take it apart the gears only go one way so if you reversed them that could be a problem.
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Well considering I'm not there I cant speculate other than what it's not likely to be and since it was a new melling oil pump (that he had apart) and cloyes gear and stock chain I can't see the brand of part being the issue. Maybe it was installed incorrectly I have no idea but he stated a worn bearing as being the cause and that's highly unlikely. I literally have a 408 that broke a main cap at over 5,000rpms (920+hp)under load on the dyno, It was pulled apart and although it junked the crank and there was no bearing left the pump was still intact.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Might just be me but when zooming in on the 2nd pic in post #1, I see what looks like a rocker trunnion needle in the mix. Of course, it may be a pin from the chain or other related debris. So, OP, have you had any previous rocker arm destruction? No other instances of parts coming loose and maybe not being 100% cleaned out?
Op when you took apart the pump did u put it in a vise at all to hold It? Possibly warped the casing? Are there any burrs on the block on the pump mounting area possibly caused it to be bolted up on an angle of sorts?
He said he replaced it for an o ring problem then the next pump went 100 miles and then this one went immediately
I wonder how much of that time the engine wasn't getting oil pressure, maybe it wiped out all the lower end and the crank is all over the place
By the way OP, did you check the thrust on the crank? Forward to rearward movement? Crank could be moving back and forth pushing on the pump...?
I wonder how much of that time the engine wasn't getting oil pressure, maybe it wiped out all the lower end and the crank is all over the place
By the way OP, did you check the thrust on the crank? Forward to rearward movement? Crank could be moving back and forth pushing on the pump...?