I have read stuff all over the internet and out of things to try.
Put used engine in. Around 130 k miles. Was in running driving explorer but did not drive far or check oil pressure. The cats were gone so if knocking I would not have noticed.
Before installing verified cassettes are good.
Start engine, all is well, oil pressure is 40-50 psi.
After 5 minutes it is 3 psi at idle.
Maybe it would go lower but I shut it off before that
This is tested with manual gauge.
Pulled pan. Replaced rods and mains. They weren't horrible but bad. Also installed new high output oil pump.
Started truck. Again sounded great. After a few minutes thought I heard knocking. Assumed I spun a bearing.
Was showing 0psi at idle.
Pulled pan, checked rods and mains, all good, looked like new.
Pulled new oil pump apart it is trashed, all scarred up. Assumed faulty pump.
Got another new pump, with new pickup tube.
Reassemble.
No change. Oil pressure loss. 0-3 psi when warm. Sounds like a knock. Just like before.
Oil filter was also changed when 2 nd pump was put in.
Pulled intake, pulled oil pump drive. Looks good, solid, no slippage.
I have no idea what to check next.
Runs great, no chain rattle but my oil pressure is going somewhere.
Help?
Thanks
Put used engine in. Around 130 k miles. Was in running driving explorer but did not drive far or check oil pressure. The cats were gone so if knocking I would not have noticed.
Before installing verified cassettes are good.
Start engine, all is well, oil pressure is 40-50 psi.
After 5 minutes it is 3 psi at idle.
Maybe it would go lower but I shut it off before that
This is tested with manual gauge.
Pulled pan. Replaced rods and mains. They weren't horrible but bad. Also installed new high output oil pump.
Started truck. Again sounded great. After a few minutes thought I heard knocking. Assumed I spun a bearing.
Was showing 0psi at idle.
Pulled pan, checked rods and mains, all good, looked like new.
Pulled new oil pump apart it is trashed, all scarred up. Assumed faulty pump.
Got another new pump, with new pickup tube.
Reassemble.
No change. Oil pressure loss. 0-3 psi when warm. Sounds like a knock. Just like before.
Oil filter was also changed when 2 nd pump was put in.
Pulled intake, pulled oil pump drive. Looks good, solid, no slippage.
I have no idea what to check next.
Runs great, no chain rattle but my oil pressure is going somewhere.
Help?
Thanks