Lost oil pressure
03-22-2010, 08:44 AM
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Lost oil pressure Installed a cam last night. started it up everything was fine. drove it home, about 30mins. seemed fine. the pressure would drop a bit when it would idle, but staying between 20-40. pulled in my drive and it stalled (still not tuned). when I went to restart it I noticed it had 0 oil pressure. pulled into garage and shut it off. it was 3am so i went to bed. started it very briefly this morning and no pressure.
Last edited by 00silverGTP; 03-22-2010 at 09:22 AM.
03-22-2010, 09:41 AM
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I just wanna add that I did the swap for him and here is what I did. Instead of fighting with the rear bolt on the pickup tube, I just swapped out the pump gear from the ls6 to the ls1. I never took the pick up tube off the the pump or loosened it. So the o ring was never out of the pump nor was the pickup tube. There was no noises when the car died from what he told me when he drove it home and none when he started it this morning.
03-22-2010, 10:33 AM
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Any reason why it would blow it off. I never took the o ring out of the pump. Honestly the pump never even got loosened off the motor. I just took the front cover plate off of it and swapped gears. Would it ironically be the sending unit even though the intake manifold was never off and we were never near the sending unit or the plug itself. Any easy way to check the sending unit to see if it is working properly?
03-22-2010, 09:23 PM
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Yes brandon that is what we did. not sure on the centering. I think the gears were just set in there. I just find it strange the pressure was fine the whole 30 min drive home, then just went to 0 all the sudden. I changed the oil tonight hoping the filter was clogged or something and still no movement from the gauge.
is there a way to manually check the pressure?
is there a way to manually check the pressure?
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03-22-2010, 09:28 PM
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Yes I did center it. I am also thinking the pump might have took a dump or something. We got another to toss in I just dread removing the pickup tube. No biggie, if it comes to that then so be it.
03-22-2010, 09:37 PM
#9
so you had feeler gages in there when you reinstalled the bolts and tightened the pump? also did you replace the cam retainer plate? torque the bolts down properly? Ive seen this situation 2 times in the last month where the gasket on the retainer plate was flatened out and did not seal properly and then the motor has little or no oil pressure.
03-22-2010, 10:32 PM
#10
Yes brandon that is what we did. not sure on the centering. I think the gears were just set in there. I just find it strange the pressure was fine the whole 30 min drive home, then just went to 0 all the sudden. I changed the oil tonight hoping the filter was clogged or something and still no movement from the gauge.
is there a way to manually check the pressure?
is there a way to manually check the pressure?
my advice is to get a mechanical gauge and check it that way. on the front of the block, drivers side, directly behind the alternator there is a plug with a hex head. take that out and get a fitting to fit into it and a few adapters to your mechanical gauge. that plug is the main oil galley. once you get the mechanical gauge hooked up, pull the fuel pump fuse and both plugs to the coil packs just to prevent it from starting, and have someone crank it over while you watch the gauge. if you get pressure that holds, put the fuse back in and connect the coil packs and let it fire. if you get pressure, your oil pressure sending unit is bad.
if you still have the filter, cut it open and see whats inside of it. just to be on the safe side.
03-23-2010, 06:53 PM
#12
My engine slowly lost oil pressure over a 2 hour span. I suspected faulty sending unit and went on my merry
Turned out it was the bypass plunger stuck. I confirmed this by spinning the engine over with the oil pressure sender removed. New pump and all is well again
Why bother touching the oil pump if you arent going to drop the pan? See what halfassing things gets you
Turned out it was the bypass plunger stuck. I confirmed this by spinning the engine over with the oil pressure sender removed. New pump and all is well again
Why bother touching the oil pump if you arent going to drop the pan? See what halfassing things gets you
03-25-2010, 06:23 AM
#16
easy now...not everyone is a Tech 12 mechanic like yourself, everyone makes mistakes. and whos to say its the oil pump?
Dont fret about your engine running dry for a little while. If it hasnt spun a bearing, then retorque the rocket bolts and run it with the new pump (assuming you see pressure like you should). These engines are pretty tough inside
03-25-2010, 06:27 AM
#17
Before taking this person's advice, consider that the oil pump o-ring operates under a vacuum, not pressure.
