Where is everyone #5

Yes oil is very black at top . I don't remember how much miles on oil but couldn't of been more than 5k . Oil on dipstick looks clean compared.. if i remember it would blow a puff of smoke at take off but nothing after that. Truck is also "demandated" if that matters... valve guides would also cause coolant loss as well or no? Was using about a gallon a day with no external leaks or excess pressure at all.

 

Dang .I'm going to guess i will find similar on this one

 

Haven't dealt much with the ISX/QSX but I don't think worn valve guides/seals would cause coolant in exhaust. Unless it's something specific to the ISX the guides on a lot of engines are typically a sleeve pressed into the head for the valve stem to slide in. Unless they're pressed in through a water jacket on these engines I don't think that's your coolant issue.

 

Guides are not gonna cause any coolant loss. I am on the fence about the combustion gas test on most diesels. It seems more pass them then fail them when they should fail. Perhaps I don’t perform them properly. Smoke could be coolant burning outta the cylinders as well. I’m betting you’re gonna find a cracked cylinder head like @Isafarmboy posted. Now I’m just guessing I’m not standing there with it so don’t take that to the bank please. If you have a lot of carbon build up around a valve spring or springs that is another sign of bad guides. Carbon build up will definitely cause an oil filter to plug up. However I feel you may have a 2 fold problem 1 causing carbon and filter stopping up and the other causing coolant loss.

 

I thinking along the same lines. Sure appreciate the info giving my brain something to chew on

 

Which cylinders was that?

 

I'd put the pressure tester on and lock it in. Don't pressure it up yourself, just start the truck and let it warm up.

In my experience, a truck with no issues won't build more than 5-6 PSI just setting there.

It would just be more info to help rule a few things out

 

See how that light is not on?
It's fixed. Comes on for a few seconds on startup and now it remains off the rest of the ride.

It seems like ABS is constantly having something wrong with it but this one is fixed permanently

 

This right here. Works on anything that runs

 

There was a few holes with cracks like that