I have an issue with one of my D8K's. I have only just bough the machines and one is using allot of oil, It isn't leaking out either internal or external, it is burning it.
The machine runs full power, not far behind the other that has a rebuilt motor. It runs clean, or relatively in the pipe but can burn up to 10 litres per day.

Now when I bough it the previouse own said it is due for a rebuild an uses a coupe of litres per day but it is using allot more.

Oil pressure is very good, starting ok as long as you pre-heat from cold.
Question I have related to products I have seen that suposidly de-glaze the bores and free up the oil rings. I would like some opinions on these product.

I know they will not replace a fresgen up of the engine but they might delay it for 6 months until our off season.

regards

Paul

Paul, take the air pipe from the turbo to the manifold off and see if the turbo is blowing oil into the intake.
Compare the blowby coming out of the breather on both machines aswell.
Is the trans oil getting black?
Later Bob

Hello Bob,

It is not making trans oil, I.E leanking from the rear main. If this was the case the trans would have been very full by now. The oil usage has settled somewhat to a couple of litres a day, as high as five. It was using 10 min. I am unable to check the differences between the two as the ather failed a trans and is currently in pieces. Should be good to go next week. Are you thinking the terbo is knackered?

Not completely worn out Paul but the shaft seals are prone to leak oil as they get more hours on them. With the consumption dropping down near normal now the seal rings might have cleaned themselves with the oil leaking by them. 2 L a day isn't bad, if it goes back up check pipe from turbo to manifold also take turbo oil drain line off and wash it out. Saw a turbo once installed with the plastic plug left in the oil return hole, turned the hood into a black oily mess on start up.
Later Bob

Paul - 2 litres a day is pretty acceptable oil consumption for an old D8. You might find changing your oil brand, and in particular, using an older spec API classification will reduce oil consumption. Also, ensure your tractor is working at correct operating temperature, and is not being idled excessively.

The newer API spec oils are supposed to be backwards-compatible with the older spec oils .. but the new spec oils have very high levels of aggressive detergents that are hard on the old tractors .. and the new oils make their way past the old tractors piston rings a lot easier.

Many years ago, when I was full-time contracting, we found that Mobil oils performed terribly in Cats. You could have a tractor running on another brand, and using little oil .. and if you swapped over to Mobil .. your oil consumption would rocket to 5-6 litres a day, from say, 1 litre a day.
It was something to do with the "slippery" additives that Mobil were using at that time .. but you could always tell a Cat running on Mobil oil, from the tell-tale blue smoke at idle.

I wouldn't use the Bon-Ami treatment except as a last resort. It does work .. but you need to be sure that the liners are glazed as a result of excessive idling, cool running, or the wrong oil type.