BBC No Oil Pressure
Greyspapa
06-15-2010, 06:37 PM
I recently lost two of my roller lifters in my A Gas Alter. Needless to say when this happened, it wiped out two lobes on my cam and an oil pump, losing oil pressure.
I replaced the cam, lifters, oil pump, and while I had the engine upside down I replaced rod and main bearings. Got the engine back together, and back in the car. When I first started it up, the most oil pressure I could get was 20lbs. Shut it down, and changed to a mechanical oil pressure gauge, still only 20lbs. I removed the distributor to check the drive and when I recently put the distributor back in and restarted the engine, had about 5lbs. Removed the valve covers, started the engine, no oil at the rockers. I am stumped on this one.
Anyone with suggestions on where to start?? Help is greatly appreciatted.
Regards
Greyspapa
I replaced the cam, lifters, oil pump, and while I had the engine upside down I replaced rod and main bearings. Got the engine back together, and back in the car. When I first started it up, the most oil pressure I could get was 20lbs. Shut it down, and changed to a mechanical oil pressure gauge, still only 20lbs. I removed the distributor to check the drive and when I recently put the distributor back in and restarted the engine, had about 5lbs. Removed the valve covers, started the engine, no oil at the rockers. I am stumped on this one.
Anyone with suggestions on where to start?? Help is greatly appreciatted.
Regards
Greyspapa
Blt2Lst
06-16-2010, 01:29 AM
I recently lost two of my roller lifters in my A Gas Alter. Needless to say when this happened, it wiped out two lobes on my cam and an oil pump, losing oil pressure.
I replaced the cam, lifters, oil pump, and while I had the engine upside down I replaced rod and main bearings. Got the engine back together, and back in the car. When I first started it up, the most oil pressure I could get was 20lbs. Shut it down, and changed to a mechanical oil pressure gauge, still only 20lbs. I removed the distributor to check the drive and when I recently put the distributor back in and restarted the engine, had about 5lbs. Removed the valve covers, started the engine, no oil at the rockers. I am stumped on this one.
Anyone with suggestions on where to start?? Help is greatly appreciatted.
Regards
Greyspapa
Did you plastigage the mains when you installed them to check for the proper clearances? If the gaps are to big, it won't build pressure.
Is the oil pump pick-up in the correct place?
I would pull the distributor and use a priming tool on a drill to spin the oil pump to see if it will build pressure that way.
Just a few things that come to mind.
Good luck
I replaced the cam, lifters, oil pump, and while I had the engine upside down I replaced rod and main bearings. Got the engine back together, and back in the car. When I first started it up, the most oil pressure I could get was 20lbs. Shut it down, and changed to a mechanical oil pressure gauge, still only 20lbs. I removed the distributor to check the drive and when I recently put the distributor back in and restarted the engine, had about 5lbs. Removed the valve covers, started the engine, no oil at the rockers. I am stumped on this one.
Anyone with suggestions on where to start?? Help is greatly appreciatted.
Regards
Greyspapa
Did you plastigage the mains when you installed them to check for the proper clearances? If the gaps are to big, it won't build pressure.
Is the oil pump pick-up in the correct place?
I would pull the distributor and use a priming tool on a drill to spin the oil pump to see if it will build pressure that way.
Just a few things that come to mind.
Good luck
maxwedge
06-18-2010, 01:12 PM
Worn cam bearings would be another issue to check here, or debris in the passages from the cam bearings.
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