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Original Message
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| Low FE428 Oil Pressure...Help |
| By John - 11/03/2000 11:16:07 PM; IP 142.177.104.29 |
I suddenly have low oil pressure in my 428. And I can't find anything wrong with it yet. I know if I strip the engine down completely, something will turn up..but I'd rather not if I don't have to.
So this is it....With a Melling high volume pump I was getting 80psi at a cold idle and 18 psi at a hot idle. Now I get 58 psi at a cold idle and 12 psi at a hot idle.
No amount of reving will get the pressure over 58 psi.
I have checked the rods and there is no play. I have checked the filter and found no debris, bearing or otherwise. All the press-in oil gallery plugs have been changed to screw-in plugs. Restrictors were fitted to the heads to keep the valves from flooding. Pump is OK...or appears to be(relief spring seems OK, but not easy to check).
Now, originally I used a HV/HP pump with this engine and got 145psi cold oil pressure, so I changed it at 1500 miles for a HV unit only. Now at 2500 miles the pressure is dropping.
Now, wouldn't you think, that with an engine tight enough to allow a high pressure pump to reach 145 psi, and that now with a HV pump that had a bypass set for 80psi it only reaches 58psi, that there should be some sort of massive internal oil leak?
Oh, I use solid lifters, so lifter gallereis are plugged.
I can't figure this out at all. Even if I had spun a bearing, which doesn't appear likely from my pushing and prodding of the rods and no sign of debris, the oil pressure should still be up, because of the small diameter galleries are restrictive in their own right.
Anyway...HELP!!!!!!!!!!!!!!!
John |
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