Letting the Turbo Cooldown vs Just Shutting the Truck Down.

When you shut the truck down. The turbo bearings cook in the oil.

Turn fan on. Water cools down and brings down the oil temperature. Before shutting truck off. No big deal in the winter but summer. I'll kick the fan on at the yard. By the time I'm parked. Things have cooled down.

The key is getting the oil cooled down as much as possible. You need the fan on to make that happen.

 

no pyros. no timers on anything i ever drove.

i always let it idle for a few short minutes each time, no matter how lightly or heavily loaded my load was.

even when i bobtailed.

 

I think the hot oil turns into a Coke substance. What happens at low idle? I’ve heard the turbo is starved of oil, also that the seal lets oil blow by at low idle. It only seals up when spinning faster. My main question has always been, why does oil bleed from all the seals on low idle? Is it oil passing through the turbo? Because it’s hot and thinner? Can’t be oil pressure, since it’s lower at lower idle.

 

When I drove LTL, the company had a batch of Navistar twin screws with ISX engines, no pyrometer, no manual engine fan switch, coming off the road into the yard there was no way to ‘cool’ the engine off, so back into the dock, unhook, go park, shut off the engine, idling all day would not help a bit.

 

yes, exactly what i learnt, that's why i always idled for a few minutes...

i shoulda mentioned that as well.

 

I do the same, 5-7 minutes.

 

I don't believe there are lip seals on the turbo simply due to how much heat is there. I honestly do not know off the top of my head what they use for seals in them - we live in a throwaway world. Turbo fails, send the core back in a box.

 

What seals are you talking about?

 

Valve cover, and just about everything else.

 

I run an Oldskool engine without all this new spangled stuff. You can still have major issues when a turbo shaft brakes, especially on the intake side.

When you hear an 855 turn into a steam engine and start cranking out 3000+ Rpm’s, things get wild, knowing the hood on your truck was replaced new because a cast iron shower blowed the whole left side of it off in years past with the previous owner…