Oil prime

ikeG

Oughta Know Better
Apr 19, 2011
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Has anyone had to fix a apparent oil prime issue? After sitting overnight, this 2021 will take around 15 seconds to build oil pressure. Which brings up the shut off engine warning on the DIC. It has new Rotella T4 15w40 and a PF63.

A google search brought up some threads on duramax forum that a couple had cracked oil pickup tubes. I cant find any TSB regarding it. I suppose i should just start tearing the oil pan off.
 

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
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Can you see any damage? My brother noticed a damaged valve on a Wix he bought last year for his 2022. Never had an issue with low pressure at startup though
 

darkness

Well-known member
Jul 15, 2009
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The pf63 is the new replacement for the pf26 right? Hope there wasn’t a bad run of those.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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I’m still using the 26’s here. I think I tried a 63 on my truck currently. It’s due for an oil change and no pressure issue.

Hopefully just isolated to that one filter!
 

darkness

Well-known member
Jul 15, 2009
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My fault, I must’ve read something wrong or it was a different post that someone had an issue with 2 filters in a row. I have a 63 on my truck now.
 

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
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Mid Michigan
Did GM do the same stupid thing with the L5P oil pickup that they did with the first Cruze diesel? Used an O-ring seal between the pickup and the block/oil pump?
 

ikeG

Oughta Know Better
Apr 19, 2011
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I have yet to have one apart but schematic looks like pump seals to upper pan vertically. Then the pickup tube inserts into the upper pan from behind, but horizontal. Without a seal. Looks like they are prone to cracking right at the bevel that it seats on when inserted the entire way.

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ikeG

Oughta Know Better
Apr 19, 2011
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Western PA
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Got the lower pan off and found the pickup tube is fine, unfortunately. There is some weird dried up sealant in the cavity where it presses into the upper pan. Maybe some of it got sucked into the pump. I'm unsure at this point.
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