Re: [BaadAssGremlins] Fw: Oil Pressure issues

If you have the pan off, tear a corner off of a dollar bill about the size of your thumbnail and remove the main bearing cap and put the corner of the bill between the main bearing and crankshaft and torque the cap to the correct pounds and see if the engine will turn by hand. do not use starter, if it turns then the mains are not correct. If it does not turn by hand then the mains should correct. I learned this from true old school real mechanic.

Billy

From: davis martin <martin-davis@xxxxxxxxxxxxx>
To: BaadAssGremlins@xxxxxxxxxxxxxxx
Sent: Thu, November 25, 2010 5:28:45 PM
Subject: Re: [BaadAssGremlins] Fw: Oil Pressure issues

Yes Bill but this is suposed to be A new engine with new bearings already.....
Sent from my MOTOBLUR™ smartphone on AT&T

-----Original message-----

From: Billy Strength <strengthb@xxxxxxxxx>
To: BaadAssGremlins@xxxxxxxxxxxxxxx
Sent: Thu, Nov 25, 2010 22:13:42 GMT+00:00
Subject: Re: [BaadAssGremlins] Fw: Oil Pressure issues

I had a 250 6 Cyl. Chevrolet that done similar and a new set of main bearings fixed it right up. There was no funny engine noises in it either.

William

From: Eddie Stakes <eddiestakes@xxxxxxxxxxxxxxxxxxxx>
To: baadassGremlins@xxxxxxxxxxxxxxx; amc-list@xxxxxxxxxxxx
Cc: "Felton, James K" <JKFelton@xxxxxxxxx>
Sent: Wed, November 24, 2010 4:35:28 PM
Subject: [BaadAssGremlins] Fw: Oil Pressure issues

Jim is having some issues with oil pressure anyone wishing to comment please feel free to do so and copy reply to him and thanks in advance to all who might reply.

Eddie Stakes
713.464.8825
eddiestakes@xxxxxxxxxxxxxxxxxxxx
www.planethoustonamx.com

From: Felton, James K mailto:JKFelton@xxxxxxxxx

Eddie,

I want to get your input. I have a 70 390 that was recently rebuilt. About 80 miles on the engine. I put in a mechanical oil pressure gauge with copper line. At start up (1200 rpm/high choke) I have 40 lbs pressure. When it kicks down to idle (700 rpm) and the oil starts heating up I lose pressure. It goes down as the oil heats. After about 7 minutes I rev it up to 2200 rpm (about cruising speed) and have 25 lbs. of pressure. After about 12 minutes it is down to 10lbs..

Input from the AMC forum is that I need to check the pressure relief valve. Could that be the problem. If that was defective wouldn't the pressure remain a constant?

Do you have any ideas? Input?

I don't hear any scary noises from the engine.

I pulled and cut the oil filter and found no metal shavings.

Thanks,

Jim