interesting,, a oil leak at the oil pump cover has developed on the 83 D-150,

was not there on the initial engin run in, but is there now, a once per second drip between the oil pump body and pump cover, at the top rear cover bolt.. (1:00 position).

this is a new dyna gear pump,, oil pressure is jacked a bit with spacers on the relief spring, but the leak is consistant at idle and higher rpm's.

this pump had the flat pump steel pump cover, I substituted in the cast OE pump cover with the two feet.

back to what's going on,, removed the pump cover, noticed that the large O ring was thinner that what came with my engine rebuild kit,, .006 cross section compared to .009 with the o ring that came with the fel pro engine gasket kit,, found the fel pro part number for the o ring to be 13338,
got one of those,confirmed the cross section to be .009 Installed it and,,,,\
the drip was less, maybe a drop every 90 seconds,, but still there.

I checked the cover with a straight edge and light,, pretty flat,,
tomorrow I am going to dig up the original dyna gear cover or lay in to it with permatex and close it back up,,
any suggestions??

Certainly not the cheapest fix, but when pressed for one of those recently (and out of my own supply) I noticed that the square cross-section rings from my HIF6 SU's fit the slant's oil pump groove. Tried one, and it works.

Likely doesn't help much though, as I get'em from Burlen, in England. Sorry.

I might consider carefully filling the trough with JB, even more carefully wiping most of it out, then re-assembling when dry with the o-ring in the now slightly shallower trough.

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I ran into this about 15 years ago with a bunch of Mellings pumps for the Fords and Chevy's. never assume that they are ready to go right out of the box. I had to surface the body of the pumps and the covers to get them flat. Also, the gears were different heights from each other by over .010". So now it takes about an hour to blueprint a pump that should have been done that way before it left Melling.

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There's no such thing as too much cam....only not enough engine!

Since your leak is limited to the area around one bolt, could there be a hairline crack in the threaded section of the pump? One way to find out is some locking fluid on the bolt, and NOT torquing it hard, in case normal bolt torque make the crack appear.

Olaf

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Aspenized

the thicker gasket and flat cover plate really slowed the drip,, but as the engine warmed the wetness around the cover plate returned,,

I pulled that pump off,, if it is any consolation to those A body owners,, even on a D-150 you need to loosen the passenger side motor mount and raise - roll the engine to get enough clearance to pull the pump ,,

on the removed pump, I really don't see a crack or porosity,, I'll check it with some dye penetrant..
for now I have another pump, one that Doc ported / has a hardened gear on it, I was planning on saving it for the barracuda but I'll stick it on the D-150,,

no one on Indy has an oil pump gasket in stock,, ordered one from AZ, will be in wednesday..

I think you should just eliminate the pump and put a Weaver belt driven scavenge pump on it. That's what a REAL engineer would do, right?

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actually I am laying out the plans for a slant six 4 valve cross flow aluminum cylinder head that uses the return force from the compressed valve springs to operate a lever actuated displacement pump, to eliminate the need for a gear driven oil pump

I probably would have had that done sunday if I did not have to jack the engine up pull the existing pump..

But will it bolt right on and use stock intake and exhaust manifolds, and valve cover? If not no one will ever buy it.

Oh yeah, it can't cost more than $150.

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That includes labor right?


OK, so fiddling with different pump cover seals (thickness) changes the rotor end clearance right? Then what? That's end of the world right? How critical is that?
I noticed two different cover seals in my Fel-Pro kit and went with the round o-ring since that was there before, I think the other one had a square profile and a different thickness. I did my bestest to measure everything to compare to FSM pump specs and all is good (thus far).

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1966 Coronet Deluxe

these are o rings,, compress to no thickness,, you are referencing flat gaskets that are used to control pump rotor to end plate clearances..

anyway,, put on the Dutra ported pump and the flat cover on ,, no leaks,, ran the truck around the block a couple of times,, things look fine,, no leaks.

I had purchased the leaky pump off e bay, as a like new slant six oil pump, with out the oil pump drive gear,, got it for < 40.00 delivered,, thinking that maybe some one else had a problem with this pump,,, did the transaction over a year ago,,not worth going back after them. I know a shop that does impreg,, I'll run it through that process.

Send it to Doug and have it blueprinted.

I know, not as sexy as your engineer voodoo you do.

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