If you took pictures during assembly look at the orientation of the main bearings. The holes should be to the block.....
post rebuild oil blues
hi, i'm new here, username spugor. I have an 04 impala with a 3.4l v6, or gm 3400 if you prefer. i recently rebuilt my engine due to rod knock, caused by low oil, stupid of me but too late now. so replaced crankshaft with used one with low miles and verified clearances, biggest one was .003, and yes i had the rotating assembly balanced. so i put every thing together and i'm getting zero oil pressure, i've tried everything and yes i packed the oil pump with assembly lube. cranked it with ignition disconnected for 10 seconds many times and cant get anything on the mechanical guage i connected. i even rigged up a pump to push oil in through the sender hole but it doesn't seem to flow in once the air in the line gets compressed. im tempted to pull the pump and repack it with grease but since it didn't work before i just dont know. any suggestions as to where i go from here?
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Thanks you for the speedy reply Bill58. I had the same thought but I made sure to match my parts and swap one by one to avoid as many rookie blunders as possible. Since i just took it apart to pack the pump again I'll check anyway just in case. BTW pump working real good when I tested it and the drive gear is definitely engaged and undamaged.
Sounds like you know what you're doing. When you figure it out let us know.
So I checked the main bearings and they are oriented correctly and the new rod bearings have no holes. Supposedly they never really needed them. I'm worried that the passage is clogged between the pump and the sensor but am unsure how to test that
Take the sensor out, crank the engine (ignition disabled) and let the pump blow it clean.So I checked the main bearings and they are oriented correctly and the new rod bearings have no holes. Supposedly they never really needed them. I'm worried that the passage is clogged between the pump and the sensor but am unsure how to test that
It's all back together again but I'd like to get one last detail clear before I test for pressure again. Most posts instruct you to pull the plugs. For ease I pulled the coil pack connectors instead. Is that perfectly fine or is there some kind of pressure effect via the vacuum pathways that makes it better to pull the plugs?
Plugs in will rpm slower but should work fine.It's all back together again but I'd like to get one last detail clear before I test for pressure again. Most posts instruct you to pull the plugs. For ease I pulled the coil pack connectors instead. Is that perfectly fine or is there some kind of pressure effect via the vacuum pathways that makes it better to pull the plugs?
OMG, still no pressure whatsoever, and seemingly no reason as to why, i'm at a loss, I've proven that it's turning, even if the pump is worn it should move some oil right? is there anything i didn't check? total WTF moment.
Any way the Oil Pump Pickup Tube could be sucking air instead of oil?
ok, so after i calmed down a bit i realized i hadn't checked if oil made it into filter, it did. so i checked whether cranking would force it through the filter ports, it does. so it turns out to be a severe clog in the tiny passage between filter and sensor. trying to unclog it now, I will make sure to post results. thank you again for your help and answers, it really helps to bounce idea's of of someone else who can think mechanically.
some metal flakes have lodged themselves in the pinhole sized port at the back of the threaded sensor port. tried to dig them out/push them back, but they wont dislodge. would drilling it out be a terrible idea? also, when they stick this motor in a pontiac it gets two oil sensors, i assume one for level, one for pressure. mine only seems to have one, the one above the filter. firstly should i have two as well, if not, can i get away with sticking it in the port that's capped off?
not a chance, for it to be in range on the dipstick the pickup is submerged by at least an inch
I was thinking the pick up tube was not properly fitted at the pump. Anyway, hopefully that's the only metal in your oil passages.not a chance, for it to be in range on the dipstick the pickup is submerged by at least an inch
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