Oil pressure problem-Excessive PSI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ratrod67 · 12-29-2005, 08:50 PM

I'm having some Oil pressure problems with my 509ci BBC. I had the motor running fine in a 71 Camaro, sold the body and installed the motor in a 72 truck. No changes to the motor at all. Started the motor for the 1st time in the truck and noticed my oil pressure was pegged at 100 psi. Shut it off imediately. Looked on the ground and saw about 5 quarts of oil. Filter was tight so I checked the oil filter adapter. Looked ok so I reinstalled it and tried again with a new filter. Same thing. 100 psi and oil on the ground. I figured the filter got bumped or maybe the adapter was bad so I went and bought another. GM parts guy said to install it with no RTV or gasket. Oil filter adapter straight to the block. Started the motor and same thing. 100 psi and oil everywhere. It's leaking from the top of the filter. Not spraying but like it's overflowing out and falling straight down. I made sure the bolts weren't too long and bottoming out and it's not coming out from higher up the motor. I had someone else start the truck while it was on jackstands and watched it flow out of the top of the filter. Also made sure I'm using the right filter as well. The adapter I'm using is part # 3952302 and filter is a Fram PH25. Any ideas?

cableguy0 · 12-29-2005, 09:03 PM

theres a clog somewhere.fram isnt the greatest filter to use anyways but it shouldnt cause that problem normally they cause lower oil pressure. go get a wix or purolator. its hard to say what might be causing your problem.if its a high pressure pump is it possible the bypass spring is stuck?

Longhorn Man · 12-29-2005, 09:30 PM

Can't help on the oil pressure issue, but I'll second the comment on fram, they make the worst filter on the market.

Guardrail · 12-29-2005, 09:46 PM

Interesting.....The leak may be caused by the bolts that hold the filter adapter to the block. You mentioned the bolts are not "too long". However some have overlooked that regular bolts have hex heads that are "too tall". If you remove the filter and look at the face of it, you may see gouges from the bolt heads. If so, the filter is tightening against the bolt heads instead of the o-ring seal. Hence a big leak.

This could be combined with another anomoly. Is the oil pressure gauge the same one you were using before? If not, it could be a bad gauge. In order to peg a 100 psi gauge when the oil is hot, the relief valve inside the oil pump would have to be stuck. That doesn't happen too often though. (Never seen that).

Just trying to give you some idea's to chase down.....

ratrod67 · 12-30-2005, 08:01 PM

Quote:

Originally Posted by Guardrail

Interesting.....The leak may be caused by the bolts that hold the filter adapter to the block. You mentioned the bolts are not "too long". However some have overlooked that regular bolts have hex heads that are "too tall". If you remove the filter and look at the face of it, you may see gouges from the bolt heads. If so, the filter is tightening against the bolt heads instead of the o-ring seal. Hence a big leak.

Turns out the filter was listed in the Fram catalog as being for a BBC but was really for a 350 ci deisel motor. Jackasses. Last time I EVER buy Fram. Got an AC Delco filter and problem is solved. If you look at the pic you will see the difference in the size of the gaskets on the filters. The Fram gasket was tightening against the bolts that hold the adapter on and not letting the filter seal against the block. Not really sure why the gauge was pegging to 100 psi but it's now about 60 when I start the truck up and about 30 when fast idle kicks down. Thanks for everyones help!

Longhorn Man · 12-29-2005, 10:03 PM

at 100 PSI, would the oil even go to the filter? It should bypass at 60 shouldn't it?

**truckdude239** · 12-30-2005, 11:59 PM

glad you got it sloved with out haveing to pull the motor apart

Longhorn Man · 12-31-2005, 12:16 AM

Yet another example on why fram sucks.

72MARIO · 12-31-2005, 02:00 AM

Hey you know what cool ?

If you buy a whole flat of A/C filtersfrom GM they sholuld be able to sell you a whole flat really cheep For a 350 they are $2 cheeper a piece than buying them seperate. All of my trucks use the same filter and every 5000k's they want a new one.

phantom dually · 12-31-2005, 02:38 AM

I bought a crap load of A/C Delco filters from K mart for $1.00 each. They where for SBC but should work on a bbc to??

12-29-2005, 08:50 PM	#1
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,269	Oil pressure problem-Excessive PSI I'm having some Oil pressure problems with my 509ci BBC. I had the motor running fine in a 71 Camaro, sold the body and installed the motor in a 72 truck. No changes to the motor at all. Started the motor for the 1st time in the truck and noticed my oil pressure was pegged at 100 psi. Shut it off imediately. Looked on the ground and saw about 5 quarts of oil. Filter was tight so I checked the oil filter adapter. Looked ok so I reinstalled it and tried again with a new filter. Same thing. 100 psi and oil on the ground. I figured the filter got bumped or maybe the adapter was bad so I went and bought another. GM parts guy said to install it with no RTV or gasket. Oil filter adapter straight to the block. Started the motor and same thing. 100 psi and oil everywhere. It's leaking from the top of the filter. Not spraying but like it's overflowing out and falling straight down. I made sure the bolts weren't too long and bottoming out and it's not coming out from higher up the motor. I had someone else start the truck while it was on jackstands and watched it flow out of the top of the filter. Also made sure I'm using the right filter as well. The adapter I'm using is part # 3952302 and filter is a Fram PH25. Any ideas?

12-29-2005, 09:03 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: Oil pressure problem-Excessive PSI theres a clog somewhere.fram isnt the greatest filter to use anyways but it shouldnt cause that problem normally they cause lower oil pressure. go get a wix or purolator. its hard to say what might be causing your problem.if its a high pressure pump is it possible the bypass spring is stuck? __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

12-29-2005, 09:30 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Oil pressure problem-Excessive PSI Can't help on the oil pressure issue, but I'll second the comment on fram, they make the worst filter on the market.

12-29-2005, 09:46 PM	#4
Guardrail And Don't Call Me Shirley Join Date: Oct 2005 Location: Cameron Park, CA Posts: 115	Re: Oil pressure problem-Excessive PSI Interesting.....The leak may be caused by the bolts that hold the filter adapter to the block. You mentioned the bolts are not "too long". However some have overlooked that regular bolts have hex heads that are "too tall". If you remove the filter and look at the face of it, you may see gouges from the bolt heads. If so, the filter is tightening against the bolt heads instead of the o-ring seal. Hence a big leak. This could be combined with another anomoly. Is the oil pressure gauge the same one you were using before? If not, it could be a bad gauge. In order to peg a 100 psi gauge when the oil is hot, the relief valve inside the oil pump would have to be stuck. That doesn't happen too often though. (Never seen that). Just trying to give you some idea's to chase down..... __________________ Rick Tucker 1969 C20/Custom Camper (the Green Machine)Sold 1970 GMC 4000 COE (future Ramp Truck) 1972 K10 Longbed (restoration begins June 2020)

12-29-2005, 10:03 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Oil pressure problem-Excessive PSI at 100 PSI, would the oil even go to the filter? It should bypass at 60 shouldn't it?

12-30-2005, 11:59 PM	#7
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Oil pressure problem-Excessive PSI glad you got it sloved with out haveing to pull the motor apart __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-31-2005, 12:16 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Oil pressure problem-Excessive PSI Yet another example on why fram sucks.

12-31-2005, 02:00 AM	#9
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: Oil pressure problem-Excessive PSI Hey you know what cool ? If you buy a whole flat of A/C filtersfrom GM they sholuld be able to sell you a whole flat really cheep For a 350 they are $2 cheeper a piece than buying them seperate. All of my trucks use the same filter and every 5000k's they want a new one. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

12-31-2005, 02:38 AM	#10
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,792	Re: Oil pressure problem-Excessive PSI I bought a crap load of A/C Delco filters from K mart for $1.00 each. They where for SBC but should work on a bbc to?? __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

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