Ok so my new rebuild was running fine and suddenly dropped oil pressure at idle when I came off a freeway ramp... Both the light came on and the guage started to fall. I then installed a mechanical guage and can see the oil pressure really drop off when the engine gets warm. Cold it had 30psi or so and then it dropped to ~8psi at idle and was still falling.
I had ~15 miles on the rebuild from my last failure...
Here is the story:
I had an engine built a few years back and it sat around for until this summer. I finished putting it together primed it up and everything seemed fine. I then lost oil pressure and all of the bearings were destroyed. I felt it was the oil pump, my machinist said it was because I didn't prime it well enough and the assembly lube had dried out blah blah.
I then had it rebuilt (along with the turbo) and then gave it another go. I carefully primed the engine, etc and now I am in the same place again.
One strange note is that I have never had any lifter noise in either failure. The head doesn't appear to lose pressure.
I removed the head and see that there is a bit of skuffing in the bores.
- I used a new Mopar oil pump, new oring on the pickup, anerobic sealer between the pump and block.
- The engine is a 2.2 crank in a 2.5 common block w/ the balance shaft hole plugged.
- The crank was turned, the rods resized all new rod and main bearings...
- The bores were honed and clearances checked.
- The intermediate shaft bearings were installed and inspected on the rebuild.
- The oil restrictor is installed.
- The distribution block isn't overtightend (that would lead to lack of oil to the head rather than the block anyway)
- The turbo feed line was clear so nothing came from it.
- The engine was primed w/ a wrench, there was plenty of oil comming out the cam caps, out the turbo feed line, etc.
The oil does not appear to have any metal in it yet but something is really wrong.
What else should be checked?!?!!?!?
My oil feed line to the turbo is AN4 but I modified the distribution block to take a 1/8" NPT direct to AN4 by chopping off the inverted flare fitting and tapping it. Does this make the line too big and steal too much oil from the bottom end (doubtful but I am racking my brain)?
I am not sure if there is an oring behind the oil filter check valve/insert. I didn't think there was one there but one of my books showed one. Is there supposed to be one? If not would it even matter since any leak would still have to go back into the oil gally...
Anyway it happend twice so there is something definately wrong.