Thread: SBC Oil pressure loss.. What the Heck??

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Hmmm.....that has me thinking... I installed an aftermarket intake too. There is a chance (small one) that the distributor mounting surface is higher (further away from the oil pump) than the original. That doesn't sound likely though...just thinking out loud.

Shouldn't be a difference, but anything is possible. Compare it to your old one. Is the distributor seated all the way down?

Don

Originally Posted by Itoldyouso

Shouldn't be a difference, but anything is possible. Compare it to your old one. Is the distributor seated all the way down?

Don

That has been my exsperiance too..usually they need shimmed up a tad for proper clearance...I guess its not out of the question for it to be the other way.

I would guess the problem is in the distributor somewhere..not engaged far enuff or broken inside......is there a shear pin inside of those?
Might be sheared off and still binding and spinning the pump some..?

Not sure where the shear pin is or if they even have them in there on that model......or if the shear pin effects the timing gear, rather than the pump rod?

When I install a new oil pump, I check the side clearance of the pump shaft before I torque the pump. I just had a 406 recently with near zero oil pressure. I pulled the eng twice, checked bearings changed bypass, changed cam bearings, changed oil galley plugs...all of which were already new. Turned out to be a bad "new" pump. Installed a milodon STD pump and it idles 40 psi hot. The previous pump was a milodon high vol unit which had a defective bypass piston. Usually when psi near zero it is a oil galley or rear cam bearing alignment to changer issue so I am told.