Strange oil pressure problem...need suggestions
08-21-2007, 10:45 AM
#1
TECH Veteran
Thread Starter
Strange oil pressure problem...need suggestions Working on a motor and its having a strange oil pressure problem. As of now, its getting about 15-20psi at idle (950-1000rpms) and will raise to about 40psi @ 3k+. Now i know first thing you will say is the pinched oring. Or a bad pressure sensor.
Well heres whats been done so far.
changed the oring 5x with the pump on the motor - same pressure
changed the pump to a GMPP pump with new oring - same pressure
changed back to a stock pump (that was working fine when taken off a previous motor) and a new oring. this time put the tube on the pump on the bench. then put the assembly on the motor. - same pressure
Changed the sending unit 2x. - same pressure
i did notice on the last swap that there was a few drops of oil from between the oil pan and the bellhousing (M6). Only thing i can think of with this is the rear main seal is leaking but i dont think that would cause a pressure problem.
any suggestions?
Well heres whats been done so far.
changed the oring 5x with the pump on the motor - same pressure
changed the pump to a GMPP pump with new oring - same pressure
changed back to a stock pump (that was working fine when taken off a previous motor) and a new oring. this time put the tube on the pump on the bench. then put the assembly on the motor. - same pressure
Changed the sending unit 2x. - same pressure
i did notice on the last swap that there was a few drops of oil from between the oil pan and the bellhousing (M6). Only thing i can think of with this is the rear main seal is leaking but i dont think that would cause a pressure problem.
any suggestions?
08-21-2007, 03:07 PM
#3
TECH Veteran
Thread Starter
Originally Posted by TheLS1Kid
The only other thing I would suggest is fresh oil and a new filter.
08-21-2007, 05:26 PM
#7
isn't this when you start thinking... spun bearing...??
or maybe you pulled a "I left a rag in the engine somewhere" trick...
o-ring is my first bet.
Did you switch to a double roller timing chain? I think they need spacers put in a certain way else they may block the passage...?
or maybe you pulled a "I left a rag in the engine somewhere" trick...
o-ring is my first bet.
Did you switch to a double roller timing chain? I think they need spacers put in a certain way else they may block the passage...?
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08-22-2007, 12:43 AM
#9
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Thread Starter
Originally Posted by TheLS1Kid
Damn thats weird, did it happen out of nowhere or did you have the motor apart?
08-22-2007, 12:45 AM
#10
TECH Veteran
Thread Starter
Originally Posted by SladeX
isn't this when you start thinking... spun bearing...??
or maybe you pulled a "I left a rag in the engine somewhere" trick...
o-ring is my first bet.
Did you switch to a double roller timing chain? I think they need spacers put in a certain way else they may block the passage...?
or maybe you pulled a "I left a rag in the engine somewhere" trick...
o-ring is my first bet.
Did you switch to a double roller timing chain? I think they need spacers put in a certain way else they may block the passage...?
nope....no rag in the pan. i wish it was that easy.
not the oring....its been changed numerous times...with the pump/tube on and off the car.
stock LS2 chain....
Go fish....
