So i just put a rebuilt 2.8 in my 86. I got it from a fellow member. So i got it all installed and when i start it with new oil and a new fram filter the oil pressure jumps to 80psi and then blows the oil seal off the filter, ive tried this a couple times and it dose the same thing. The story with the motor is that it was sitting for a year or so. but was rebuilt and has very low miles on it.
oil pump regulator is hosed. part of oil pump. and/or something major wrong w/ engine
Filter bypass? Not likely. Bypass opens ~7psi difference between in and out on the filter. this shouldn't blow filters
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
Edit: If there was truly something blocking an oil passage somewhere early in the oiling system of the engine, I have no idea how you would troubleshoot that... no oil getting up to the top of the heads, I suppose, but then I would worry about bearings. In that case, the regulator in the pump would still hold the pressure down correctly, regardless, especially at idle. So I would change the pump as Ogre suggested.
[This message has been edited by carbon (edited 07-19-2013).]
On the half of the oil pump that the pickup tube attaches to, there will be two maybe quarter inch holes, one has a freeze plug in it, the other has a pin in it vertically that is holding a spring and valve in there. This is the pressure release valve. Yours is probably stuck.
If you pull the pan, you can easily unbolt this half of the oil pump without removing the oil pump from the block. It is 4 ten mm bolts I think holding the two halves of the pump together. Watch out the gears will fall out too. You can use this opportunity to get a pump rebuild kit and replace the gears in the pump, and it might even come with the release valve.
You will need to remove that pin to replace the valve. You can try soaking the removed part of the pump in something to dissolve anything that my be blocking the pressure release valve.
PS there is no gasket between the two halves in case you think you are missing it.
Good luck! it should be easy to do once the pan is removed, there are threads on how to remove the pan in car.
The car is oiling to the top of the motor, heads, rockers, lifters out of the dist ect. it can idle and not blow oil but if i rev it it blows, ill drop the pan this weekend.
Great news, It was the pressure relief valve in the oil pump. It was stuck like chuck. New oil pump and she is idleing at about 60 psi. when it's warm i'm at about 55ish psi. Now ill be driving her again.
Had this happen with my sbc oil pump. The pressure would go over 100 PSI and rip the filter down the side. I was able to clean the valve piston and get it working again. Glad you got yours going!
