tahoe no oil pressure

[Rocket Man]

Melling website has a video on how to prime LS style engines..
worked perfectly for me last time I did a pump/ timing chain replace

It’s linked above in a post by @wjburken.

 

[tneels]

We did all of that. still nothing. It's for me confused

 

[tneels]

We have a mechanical Guage on it and replaced the screen as well. Still nothing. I did start it finally after cranking it over and over and over and revved it up to 3000rpm and Guage shot up to 20psi for a second then when I let off the accelerator it drops to 0.

 

[tneels]

So new oil pump new ouch up tube with o ring new screen mechanical Guage still no oil pressure at the top of the motor did get 20 psi after I started it and revved it up to 3000rpm but when I let off the accelerator it drops to 0. I cannot figure this out also put in a new vlom

 

[gooffeyguy]

Have you pulled the valve covers and checked that all the pushrods and lifters appear to be ok?

 

[Foggy]

That used engine prob has bad cam bearings or bad main bearings... therefore no
oil pressure.
If you started it up or even cranked it a lot before you primed the new pump the correct way
as mentioned before, You may have ruined the new pump and the used engine...
Sorry

 

[Foggy]

Also, what oil filter are you using..???? Maybe you have a clogged filter or a bad one..
Anything IS possible here... Just trying to help

 

[tneels]

I never turned it over before priming the new pump.

 

[tneels]

I was just told to try changing the filter. We have an acdelco filter in it now. I was thinking of changing the filter and doing an engine flush then draining it and changing the filter and oil again

 

[tneels]

Also did pull the valve covers and all the lifters and push rods appear to be OK