Oil leak

Did you check the rear main bearing clearance? Also have you checked that the drain slot & drain tube in the rear main bearing cap is not blocked. I have found this problem before on a shop built engine.
Phil.
 
Bored&Stroked said:
You could try a stock lower-pressure pump - as it currently appears to have the later 49-53 pump - which will put out more volume and pressure than stock.

While I hate to mention an alternative direction, but here goes.

You already have the engine out of the car, so why not think about pulling the crankshaft, having the slinger ground off and switching over to the later rope-type seal plates? You'll only have a few more hours of work to do this . . . and it beats putting it all back together (even with a new pump) - only to see the same problem once again.

Or just put a later crankshaft in it . . .
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Great advice. Do it now!


Glenn
 
The original pressure relief is installed in the valley. Could be the first time it opened since the I changed out the oil pumps. I did notice with the old pump what looked like a stream of oil that came out of between the block and the pump directed toward the pan gasket, I suppose 50# of oil pressure could erode through the gasket and cause a leak.
 
rockfla said:
NO gasket where the oil pump bolts and mates to the block......WITH that said....I do use a O-Ring in the chamffered groove just under the flange of the oil pump (8BA pump) and just inside where it fits into the block. IT certainly doesn't hurt any thing AND its a seal that keeps oil up in gear chamber and stops ANY potential oil getting out from where the oil pump bolts to the block. Less than a $1 and can't hurt anything!!!!
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Regarding this good suggestion to use an O-ring, what is poking out around the pump base?


552554
 
This rubberized cork strip partly tore, twisted & squeezed out of the groove on mine. Leaked like a sieve while running. Ended up using a neoprene strip glued to the groove.
552558
 

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Rear main clearance is good, and cap and pipe are clear. The shine you see by the oil pump base is light reflecting off a thin oil film. You can see where the gasket is a little eroded beside the pump.
 
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