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L33 issues

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Old Apr 28, 2014 | 01:01 PM
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Default L33 issues

Swapped an 06 L33 DOD motor from a envoy into my C-10

https://ls1tech.com/forums/conversio...ip-c-10-a.html


Its been in and running for a few weeks, been chasing electrical/tune issues. But it has developed an oiling issue now. Probably have around 150-200 miles on the motor. The other night i noticed it only has 10-15psi at idle and 35-40 at cruise speeds. It had 35 and 50+ normally up to this point. Trying to figure out potential issues.

I drained/strained the oil the next day and found some material but didn't seem excessive considering it has all new bearings. I put a heavier oil in and that didn't change the pressure. Talked to machine shop today and he said most likely the main bearings are failing. So i pulled the filter off today and looked in the pleats and it really doesn't have any metal particles in there that were obvious. So when i assembled the engine and removed the DOD solenoid valley cover, i replaced it with a 6.2 cover with the orings to seal against the oiling stands. I've been told that would be fine vs. drill/tap/plug them all.

Just curious if anyone would suspect the cover as a possible issue. At this point im not sure what else to do except drive it till it spins some bearings, or maybe pull pan and pull a main cap to look?








Last edited by static low 92; Apr 28, 2014 at 01:36 PM.
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Old Apr 28, 2014 | 02:52 PM
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To my knowledge, L33 never had DoD. I could be wrong.
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Old Apr 28, 2014 | 03:23 PM
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Originally Posted by JoeNova
To my knowledge, L33 never had DoD. I could be wrong.
Mine did for sure, it was a pullout that never had a gasket broken when i got it. And had solenoid valley cover and goofy lifters with springs.
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Old Apr 28, 2014 | 04:06 PM
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Originally Posted by static low 92
Mine did for sure, it was a pullout that never had a gasket broken when i got it. And had solenoid valley cover and goofy lifters with springs.
Then it wasn't a L33. There were various other aluminum block 5.3L variants.

Andrew
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Old Apr 28, 2014 | 04:20 PM
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O-Ring on the pick up tube
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Old Apr 28, 2014 | 04:27 PM
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You have a LH6:

http://archives.media.gm.com/us/powe...06_PWT_LH6.pdf

Andrew
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Old Apr 28, 2014 | 05:21 PM
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Pull pan and remove a couple caps... give you an Idea of what the bearings look like. But check o-ring too
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Old Apr 28, 2014 | 09:47 PM
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So the noise that I have is coming from timing cover. Maybe oil pump rattling? Anyone ever had a pump failure? Maybe this explains the low oil pressure
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Old Apr 29, 2014 | 08:19 AM
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The bypass assy could be stuck in the oil pump or front main and/or rod bearing has failed.
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Old Apr 29, 2014 | 01:53 PM
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Almost positive i haven't murdered main bearings yet. I found no traces of metal in the oil filter.

But i did read today about shimming the oil pump to center it on the crank with thin metal. I never heard anything about that till today. Obviously i didn't shim it when it got assembled. Would make sense to have a rattle because of that...

Anyone have experience with shimming/not shimming oil pumps? How would it effect pressure?

I assume the end game here will be me pulling the motor to replace/shim pump and reassemble it
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Old Apr 29, 2014 | 03:06 PM
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Originally Posted by lsxRanger94
The bypass assy could be stuck in the oil pump or front main and/or rod bearing has failed.
+1 A friend of mine had this happen to him last week.
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Old Apr 29, 2014 | 03:20 PM
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Originally Posted by Hart_Rod
+1 A friend of mine had this happen to him last week.
What were his symtoms?
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Old Apr 30, 2014 | 06:32 AM
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Usually very low to no oil pressure.
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