No Oil Pressure
Thread Starter
Teching In
Joined: Dec 2018
Posts: 4
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From: Minot, ND
No Oil Pressure About a year ago I spun a bearing on my 07 Trailblazer SS AWD. I recently replaced the shortblock with a brand new one and installed the heads and everything else (with new seals and gaskets of course) onto the new engine. Threw it back in the car and wired up and everything. I am trying to prime the engine with oil by pulling the plug wires and unplugging the fuel injector connectors. I tried this maybe 10 times but got no oil pressure. I am using 6qts or royal purple break in oil if that means anything. Can someone help me out? Need oil pressure before I can start the engine up. Thank you
TECH Fanatic
Joined: Dec 2017
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From: Bossier City, Louisiana
Remove the spark plugs so that the engine can crank easier. IIRC, my 150K miles used LM7 engine blew almost 40 PSI cold vigorously cranking on a good battery before I started it. This was using an Autometer oil pressure gauge with the hollow plastic tube connected to the port where the oil pressure sending unit would normally go.
Rick
Rick
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Joined: Jun 2016
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From: Central Cal.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
On a fresh bottom end I find it more efficient to fill the oil pump by removing the front galley plug and funneling oil in there. Melling has a pretty good video on how to do this. The one issue with this is the brackets, headers and accessories can be in the way if you don’t plan this out during the re-install.
If you’re really concerned, you can pressure-lube at this same galley before the initial start too.
If you’re really concerned, you can pressure-lube at this same galley before the initial start too.
