Low oil pressure 04 ls1 gto
05-11-2018, 09:46 AM
#1
Teching In
Thread Starter
Low oil pressure 04 ls1 gto 
Does anyone know some reasons i could be having low oil pressure with my motor it starts and 20 psi cold then drops down to 7 psi. The engine has wiesco -25cc dished pistons, eagle I beam rods, kings rod and main bearings, durabond hp cam bearings, machine work done by a local machine shop, melling high pressure oil pump, trick flow dual timing chain, sac city corvette oil filter bypass delete and stainless barbell, arp main studs. I have changed the pickup tube oring 3 times and still haven’t had any luck, anyone have any suggestions on what it could be maybe orientation on rods backwards? Thanky you!
05-11-2018, 12:02 PM
#3
There are too many variables to say just one thing is the issue. You might have to tear it back down and go over everything. ie. spacers for oil pump for the dual timing chain, front cam plate seal. Rear cover seal. All the clearances ( main, rod, lifter bore, cam bore, that billet barbell, my machine shop didn't recommend it.) Did you check the spring in the oil pump?
05-11-2018, 02:27 PM
#4
TECH Resident
Someone else just went through a similar situation on here. The machine shop didn't put the oil gallery plug back in after cleaning out the engine. It caused an internal oil leak that prevented the engine from building pressure.
05-11-2018, 02:32 PM
#5
05-11-2018, 09:03 PM
#7
Hi,
Were new cam bearings installed? I know some guys say don't worry about cam bearings but we have learned the hard way that new cam bearings should be installed or the old ones can cause low oil pressure issues.
What was the oil pressure at cruise and high RPM? Seems like most people only talk about idle pressure when high RPM is most important. 7psi at idle is low though. Did you put a mechanical gauge on it to verify you a it
is not malfunctioning gauge?
Thanks
Christian
Were new cam bearings installed? I know some guys say don't worry about cam bearings but we have learned the hard way that new cam bearings should be installed or the old ones can cause low oil pressure issues.
What was the oil pressure at cruise and high RPM? Seems like most people only talk about idle pressure when high RPM is most important. 7psi at idle is low though. Did you put a mechanical gauge on it to verify you a it
is not malfunctioning gauge?
Thanks
Christian
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05-11-2018, 09:42 PM
#9
Teching In
Thread Starter
Hi,
Were new cam bearings installed? I know some guys say don't worry about cam bearings but we have learned the hard way that new cam bearings should be installed or the old ones can cause low oil pressure issues.
What was the oil pressure at cruise and high RPM? Seems like most people only talk about idle pressure when high RPM is most important. 7psi at idle is low though. Did you put a mechanical gauge on it to verify you a it
is not malfunctioning gauge?
Thanks
Christian
Were new cam bearings installed? I know some guys say don't worry about cam bearings but we have learned the hard way that new cam bearings should be installed or the old ones can cause low oil pressure issues.
What was the oil pressure at cruise and high RPM? Seems like most people only talk about idle pressure when high RPM is most important. 7psi at idle is low though. Did you put a mechanical gauge on it to verify you a it
is not malfunctioning gauge?
Thanks
Christian
05-11-2018, 10:13 PM
#11
Teching In
Thread Starter
05-11-2018, 10:34 PM
#12
What was the cruise and high rpm oil pressure?
Thanks
Christian
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05-12-2018, 12:03 AM
#13
Teching In
Thread Starter
They didnt give me any paperwork on my clearances just got the motor back and through it in they said it was spec’d out to 1200-1300 hp but that doesnt help me much
05-12-2018, 04:53 AM
#14
05-12-2018, 10:01 AM
#15
Ok I know this is going to sound very basic but did you check the oil pump relief valve? Sometimes on a new build small particles in the oil could hang the valve open. Look there 1st if not you have to go through everything till you find the issue. Things like the cam retainer plate, rear cover gasket leaking internally, BEARING CLEARANCES. BUT<there is always a but> you have a huge leak to dump that much pressure, that's why I'm thinking relief valve stuck 1st.
05-12-2018, 10:14 AM
#16
TECH Resident
Scroll down to pic 4. That little plug would be easy to overlook. Since it works like a freeze plug there's always an off chance that it's in crooked or a hair under size. The only issue is that you'd have to pull the front cover to check.
If you do open it up I'd also be looking at pickup to pan clearance, o-ring pinched, pressure relief valve sticking, plus whatever else I could see while I was there.
05-12-2018, 11:42 AM
#18
Teching In
Thread Starter
Ok I know this is going to sound very basic but did you check the oil pump relief valve? Sometimes on a new build small particles in the oil could hang the valve open. Look there 1st if not you have to go through everything till you find the issue. Things like the cam retainer plate, rear cover gasket leaking internally, BEARING CLEARANCES. BUT<there is always a but> you have a huge leak to dump that much pressure, that's why I'm thinking relief valve stuck 1st.
05-12-2018, 11:44 AM
#19
Teching In
Thread Starter
http://www.superchevy.com/how-to/engines-drivetrain/1512-check-out-this-useful-ls-small-parts-guide/
Scroll down to pic 4. That little plug would be easy to overlook. Since it works like a freeze plug there's always an off chance that it's in crooked or a hair under size. The only issue is that you'd have to pull the front cover to check.
If you do open it up I'd also be looking at pickup to pan clearance, o-ring pinched, pressure relief valve sticking, plus whatever else I could see while I was there.
Scroll down to pic 4. That little plug would be easy to overlook. Since it works like a freeze plug there's always an off chance that it's in crooked or a hair under size. The only issue is that you'd have to pull the front cover to check.
If you do open it up I'd also be looking at pickup to pan clearance, o-ring pinched, pressure relief valve sticking, plus whatever else I could see while I was there.
05-12-2018, 12:24 PM
#20
With a straight edge and ruler. Measure from the oil pick up to the block oil pan rail. Lay the straight edge across the pan with the gasket installed and measure to the bottom of the pan. The pick up/ block measurement should be 1/4" shorter minimum than the oil pan measurement.