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Sullair 185 Compressor engine oil overflows during use

Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
I have a Sullair 185 Rotary Screw Air Compressor with a John Deer 4 cy diesel engine. The unit was make in the mid 80s. The engine oil started overflowing while the unit was operating. The engine oil does not appear to be diluted like it would be if fuel was getting into crankcase. The air compressor oil volume also does not appear to be going down. Does anyone know where this excessive oil could be coming from?
 

mg2361

Senior Member
Joined
Jul 5, 2016
Messages
5,310
Location
Pennsylvania
Occupation
Equipment Mechanic
Where specifically is the oil flowing out on the engine? Pictures?
 
Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
The oil is coming out of the breather vent coming out of the valve cover.
Tyler the coolant level has not changed.
https://www.heavyequipmentforums.com/members/tyler-d4c.54670/

I am going to drain the oil down to full and run it again Monday. I think there is about 1 gal of extra oil in the crank case. Thursday morning the oil level was at the full mark.
 

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mekanik

Senior Member
Joined
Aug 20, 2015
Messages
998
Location
Canada's Northwest
If the oil level is staying between the marks on the dipstick then I suspect you have a crankcase pressure issue that's pushing the oil out of the vent. It might not hurt to remove the valve cover, there may be a baffle covering the outlet on thew valve cover that has come unfastened.
 

eastroad

Well-Known Member
Joined
Jun 4, 2008
Messages
89
Location
SW Vermont
Does the oil seem to be diluted or thinned out with fuel? If the diaphragm in the fuel transfer pump goes bad, the fuel can enter the crankcase that way, leaking internally. That would be the first thing I would suspect on that JD engine.
 
Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
The oil level went above the full line. It is staying above the full line and blowing the excess out through the valve cover breather vent house. It pushed quite a bit out. I will collect it tomorrow when we run it. I have a solid day of drilling left.
The oil does not seem diluted. I will check out the fuel pump.
The date is 8 16 22. We just service the machine. It has about 60 hrs on this oil change. We use Rotella T4 15w40
 

92U 3406

Senior Member
Joined
Jan 3, 2017
Messages
3,283
Location
Western Canuckistan
Occupation
Wrench Bender
Something has to be dilluting it. Oil just doesn't magically appear. Generally the only 2 culprits are fuel and coolant. If you want to know for sure, send in an oil sample and they'll tell you what's getting in there.
 
Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
Exactly oil does not appear. I will check with our local fuel oil supplier to see if they can test the oil. That will tell the story.
I don't see a remote oil reservoir. I also looked for a remote cooler but did not find one. I was suspecting that somehow the compressor oil was getting into the engine through a cooler but don't see a path.
I so appreciate everyone's comments and ideas.
 
Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
I appreciate the help from everyone here. We found the problem. The compressor side had a leak close to the vent hose. The oil was collecting in the hole in the dust/ dirt on the floor of the machine that the bottom of the vent hose made . Every time I pulled the hose up oil was dripping from it. The leak finally got bad enough we saw where it was spraying from. Again thank every one. This one had me stumped and very concerned. We had to stay head of the guy blasting rock this morning and there were not any large air compressors anywhere to rent.
 

stinky64

Senior Member
Joined
Feb 25, 2017
Messages
943
Location
java center ny
Occupation
big truck wrench/fixer of things
Did you investigate the oil level issue? I have replaced several of those Deere lift pumps with the very same issue, leaky diaphragms.
 
Joined
Oct 14, 2022
Messages
11
Location
Sandpoint Idaho
I am going to replace the lift pump. Its been setting waiting for the next drill project. Very likely it is leaking. I am also thinking that I have low fuel flow. That will kill two birds with one stone.
 
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