2020 Chevy Duramax 3.0 Diesel

ksss wrote:

ib516 wrote:
They don't have the manual up on their website yet for the 3.0L Duramax I6, but for the 2.8L I4, the timing belt needs to be changed at 150k miles. I wonder if that is extended for the I6 3.0L because it is in the back?

On Edit - In doing some web searching, it looks like the "timing" is chain driven (on the back of the engine), but the OIL PUMP is belt driven (also on the back of the engine). Maybe there's a way to change it without engine removal?

That is some of the questions I want to look into. If the belt can be accessed without pulling the guts out of the pickup, I would feel better. I am not sure how that can be possible since you look at any new diesel pickup and you cant even touch the engine block with your hand much less a wrench. Granted have not looked at the 3.0 maybe it is accessible somehow. A belt driven oil pump would on the surface seem to be a bad idea, I am no one's engineer but belts when they go, they go in a catastrophic way. There is no way to check this belt like you can with belts on the front of your engine. So your just hoping all is well until your oil psi light comes on, and you got seconds to get it shut down.

I would say at a minimum to replace the oil pump belt is remove the following:
Transmission
Flex Plate
Rear engine cover/rear main seal
Pulley off of crank

After this work is done then one will have to hope there's no unintentional consequences like oil leaks.