New Engine...Low Oil Pressure

[GMperformance03]

Just to update...

Supposedly a cam bearing was installed incorrectly causing the low oil pressure issue. I will be picking the Yukon up tomorrow to find out for sure.

The rebuild consisted of (actual ad below):

Block is bored .20 over. New pistons, rings, cam, cam bearings, main bearings, rod bearings, lifters, hv/hp melling oil pump, seals and gaskets, valves, springs, etc... Block gets decked, line honed and heads are checked and resurfaced. Nothing is forgotten or skipped.

After driving Yukon tomorrow I will update this thread.

Thanks for all the great replies.

 

[Rocket Man]

Awesome. Not forgotten, just done wrong so you go through hell.

 

[GMperformance03]

So the idiot engine shop out of western MI did not fix the problem. I still have low oil pressure (15-20 psi) hot idle, & 40 psi idle at 1,500 rpms.

I will withhold their name until this situation is fixed and/or if I need to get legal representation. Their solution now is to change the block to a cast iron block and their claim is that the aluminum block is defective. Do they even make a 6.2 liter cast iron block?

This is the third engine that they’ve installed and the fifth time the motor has been removed and reinstalled. I have spent almost $1k on rental car expenses in addition to the multiple times I’ve had to drive from Indiana to Michigan.

 

[Rocket Man]

So the idiot engine shop out of western MI did not fix the problem. I still have low oil pressure (15-20 psi) hot idle, & 40 psi idle at 1,500 rpms.

I will withhold their name until this situation is fixed and/or if I need to get legal representation. Their solution now is to change the block to a cast iron block and their claim is that the aluminum block is defective. Do they even make a 6.2 liter cast iron block?

This is the third engine that they’ve installed and the fifth time the motor has been removed and reinstalled. I have spent almost $1k on rental car expenses in addition to the multiple times I’ve had to drive from Indiana to Michigan.

View attachment 225838

Wait...three different engines? Three different blocks or are they rebuilding the same block? I’m confused.

 

[GMperformance03]

Rebuilding the same block.

 

[swathdiver]

Rebuilding the same block.

This is terrible Greg and am sorry you're going through it. All the 6.2 blocks are aluminum. The 6.0 are made in both materials.

Engine building 101 was to have the block checked for cracks when it was cleaned. We used to have the blocks and the heads magnafluxed or sonic tested before we did anything to them lest money be wasted.

Time for a GM Performance crate motor, L9H or L94?

 

[GMperformance03]

Anyone have any recommendations on reputable machine shop or engine builders at reasonable prices?

I really am trying to stay away from a 6k-8k engine cost, other than Jasper. Thanks

 

[Wambliokiye]

Just to update...

Supposedly a cam bearing was installed incorrectly causing the low oil pressure issue. I will be picking the Yukon up tomorrow to find out for sure.

The rebuild consisted of (actual ad below):

Block is bored .20 over. New pistons, rings, cam, cam bearings, main bearings, rod bearings, lifters, hv/hp melling oil pump, seals and gaskets, valves, springs, etc... Block gets decked, line honed and heads are checked and resurfaced. Nothing is forgotten or skipped.

After driving Yukon tomorrow I will update this thread.

Thanks for all the great replies.

6.2?

 

[GMperformance03]

6.2?

Yes. 2007 6.2

 

[swathdiver]

Anyone have any recommendations on reputable machine shop or engine builders at reasonable prices?

I really am trying to stay away from a 6k-8k engine cost, other than Jasper. Thanks

https://www.gmperformancemotor.com/parts/19329865.html

New Short Block, 3 Year, 100K Mile Warranty. You can often find used engines locally in totalled vehicles, still running, so you can verify that they're good. Ebay has a bunch for under $3K with free shipping.

How are you with turning wrenches?