Headswap, now very low oil pressure
#1
Headswap, now very low oil pressure
My roomate had some Stage 2 heads put on his Z a few days ago. Last night he calls me and tells me that his oil pressure is at 5psi or so at idle, sometimes so low the engine stalls. So I tell him not to drive it anymore until we figure out the problem.
He's worried it's a main bearing, but I'm convinced it has something to do with the heads. There's no knock or any abnormal sound from the engine, but it does shake alot worse than usual. I just find it a huge coincidence that he gets new heads and then his oil pressure drops. So is there anyway possible that the heads could be causing this very low oil pressure?
He's worried it's a main bearing, but I'm convinced it has something to do with the heads. There's no knock or any abnormal sound from the engine, but it does shake alot worse than usual. I just find it a huge coincidence that he gets new heads and then his oil pressure drops. So is there anyway possible that the heads could be causing this very low oil pressure?
#2
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Did you do anything else when you did the heads? What was the oil pressure before hand? Did you crack or break the oil pressure sending unit when removing the intake manifold?
More information would be useful.
More information would be useful.
#3
Originally Posted by term
Did you do anything else when you did the heads? What was the oil pressure before hand? Did you crack or break the oil pressure sending unit when removing the intake manifold?
More information would be useful.
More information would be useful.
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Dumb question: Are you sure you the heads are on the correct sides, and not blocking the oil passages?
-Mike
-Mike
Last edited by chupr0kabra; 10-31-2004 at 04:48 PM. Reason: I kant spel
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Originally Posted by chupr0kabra
Dumb question: Are you sure you the heads are on the correct sides, and not blocking the oil passages?
-Mike
-Mike
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Originally Posted by chupr0kabra
Dumb question: Are you sure you the heads are on the correct sides, and not blocking the oil passages?
Some head gaskets are directional, but that will only effect the coolant passages.
His oil pressure gets low enough to make the motor stall?? If that's true, that's bad
#11
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If this motor is an LS-1 then it is my understanding the heads can be used on both sides however the gaskets need to be on the correct sides.
Did your friend tear his oil pick up o-ring? I tore and replaced mine a couple of months ago when I did my H/C swap.
Did your friend tear his oil pick up o-ring? I tore and replaced mine a couple of months ago when I did my H/C swap.
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Originally Posted by y2khawk
Heads are not direction, side to side. The only oil that gets to the top end is supplied through the pushrods.
Some head gaskets are directional, but that will only effect the coolant passages.
His oil pressure gets low enough to make the motor stall?? If that's true, that's bad
Some head gaskets are directional, but that will only effect the coolant passages.
His oil pressure gets low enough to make the motor stall?? If that's true, that's bad
-Mike
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Just doing the heads should NOT affect the oil pressure unless a mistake was made during the install. This alone would not cause the crappy running symptom you describe. That sounds like a separate problem. You may not actually have low pressure, but one would think that if the sender or associated wiring was actually damaged you would read "0" psi not 5 lb. It sounds like you you have two problems to solve. Should have gone to LS1 How To before this install and you wouldn't be asking these questions
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Originally Posted by y2khawk
Heads are not direction, side to side. The only oil that gets to the top end is supplied through the pushrods.