Posted by Bob on April 24, 2018 at 11:46:51 from (64.255.159.199):
Neighbor has a big Versatile/Buhler tractor with a QSX15 Cummins, 1600 hrs. from new.
Suddenly started burning a gallon to a gallon and a half of oil a day.
I suggested pulling an oil sample, but they had just changed the oil.
Got Cummins to look at it, wrench thought it might have been "dusted" and checked air filter and tubing and turbo and found no signs of dust. Checked for oil loss in the turbo, as well.
Runs real well, with no visible smoke.
Owner was told by a couple of "experts" that the positive valve stem seals can move up off of the guide, then they'll burn oil.
I said losing a lot of oil past the valve guides isn't likely on a turbo diesel, where both the intake and exhaust ports have positive pressure.
I told him it is only in recent times these big diesels even use valve stem seals, because with strict emissions rules, even containing a slight amount of oil is important.
He persisted in obsessing over this 'til we pulled the valve cover and (using an inspection mirror) looked at all 24 valve seals, which seem to be in place down on the guides and all the little garter springs on the seals are intact, as well. Another "expert" told him one may be cracked.
When fieldwork starts, they are going to run it for a couple of days, checking the oil often, to put some hours on the new oil, then send in an oil sample.
Summing up, my question for the group is "does anyone believe a failed valve stem seal on this engine would lead to huge oil consumption"?
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