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Oil out exhaust

4

4520BW

Well-known Member
I went and looked at a real nice bobcat except it had oil poring out exhaust. My thought is turbo, seen many do this over the years, My question is there any other way that much oil could get in exhaust? It fired right up and had plenty of power. I can get a good deal but worried since its a Kubota diesel and I have seen several out them have major engine problems.
 
Lots of idling, not running under power, and up to temperature will cause that.

If this is on a lot for sale, good chance that has happened.
 
If this was a Cat machine with a perkins, the crankcase vent has a problem that will knock the seals out of the turbo. But gonna agree with Steve and it be wet stacking if in a cold area during this time of year.
 
An individual has it and it started puking oil so he shut it off. It's a fair amount of oil so guess it is the turbo.
 
Wet stacking would not be pouring , a dribble.
If it's running on all cylinders the turbo is a safe bet.
 
If the rotor is tight in the turbo and does not appear to have rubbed the case, the turbo may be OK, it could be a plugged crankcase vent or turbocharger oil drain or anything else that pushes oil out of the turbo. If you eliminate the cause the turbo will likely be OK.
 
I don't know about Kubota. Shibaura, which is designed much like the Kubota, has a spring loaded crankcase vent valve. That either sticks, or gets a drop of moisture on it and freezes. On a turbo'd engine it blows lots of oil out the exhaust. On a naturally aspirated engine it can blow the dipstick right up out of its holder. Remove the spring, or the whole thing in cold weather.
 
I had an ASV track loader at the same time a friend had a CAT skid steer. Both had CAT/Perkins/Shibaura engines. 3 cylinder in the little ASV, turbocharged in the CAT. Both has issues with the crankcase vent at the same time. I don't know who really manufactured the engines. It's definitely a Shibaura design. CAT owned ASV for a time, so the CAT labeled engine and controls were used. The little 3 cylinder naturally aspirated engine I had was the same engine Ferris used in their 'big' CAT diesel zero turn mower.
 
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