CHEVY NO OIL PRESSURE

2005 Chevrolet Silverado

Tiny

txhotrod

May, 3, 2008 AT 12:22 PM

Engine Mechanical problem
2005 Chevy Silverado V8 Two Wheel Drive Automatic 86000 miles

Installed a new cam in the motor, after initial startup there was no oil pressure registered on the gauge. We replaced the oil pump with a brand new Melling unit. Reassembled engine and tried again, this time disabled the starting system and just cranked it. No pressure registered on the guage. Pulled valve covers to verify and there is no oil pumping up pushrods. I am stumped, has anybody got any ideas? Do you prime the pump, if how? Any resoponse will be appreciated.

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6 Answers

Tiny

Buzzsaw

May, 3, 2008 AT 2:20 PM

Whats your engine size? 4.8 or a 5.3, also to make sure Im looking at the right picture is the oil pump mounted to the crankshaft

Tiny

txhotrod

May, 5, 2008 AT 7:20 AM

It is a 5.3 and yes the oil pump is on the front of the motor, being turned by the crankshaft.

Whats your engine size? 4.8 or a 5.3, also to make sure Im looking at the right picture is the oil pump mounted to the crankshaft[/quote: e8cec071ef]

Tiny

Buzzsaw

May, 5, 2008 AT 4:16 PM

Whats your engine size? 4.8 or a 5.3, also to make sure Im looking at the right picture is the oil pump mounted to the crankshaft[/quote: 53e4c893e5][/quote: 53e4c893e5]

yes you do have to prime it, you fill it full of oil and then use clean fresh white lithium grease to keep it in there( cover the holes with it )

Tiny

txhotrod

May, 5, 2008 AT 6:38 PM

So you are saying to plug up the outlet hole by the pressure relief valve with grease, fill up the pump then do the same to the inlet and install the pump? Correct?

Tiny

Buzzsaw

May, 6, 2008 AT 1:05 AM

Yes with white lithium grease in a tub then install it, before putting everything back together see if you have pressure(turn it over), make sure the crank is turning, make sure the key is in the crank for the oil pump flange that goes into the pump off the crank

Tiny

txhotrod

May, 6, 2008 AT 8:17 AM

It worked! Put it back together and it immediately picked up oil pressure upon starting. Thanks!

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