John Deere 3010 crankcase ventilator pump.

[Texgasser1]

I disconnected the pipe that goes to the top of my JD 3010 gas tractor, crankcase ventilator pump and cranked my tractor, Oil started coming out of it.

I do not believe this is suppose to happen.

Can y'all please explain what a Crankcase ventilator pump is, what it does and how it is suppose to operate?

Thank You, in advance.

 

[Bob Bancroft]

I disconnected the pipe that goes to the top of my JD 3010 crankcase ventilator pump and cranked my tractor, Oil started coming out of it.

I do not believe this is suppose to happen.

Can y'all please explain what a Crankcase ventilator pump is, what it does and how it is suppose to operate?

Thank You, in advance.

I can only tell you that on my early 4020 I took the connecting line off and plugged off the pump and the manifold.

 

[Texgasser1]

I can only tell you that on my early 4020 I took the connecting line off and plugged off the pump and the manifold.

I guess it still runs fine?

 

[Texgasser1]

This one makes my head hurt, i just took off the intake tube from the air cleaner and carb, I looked inside and the small pipe which come off and goes to the Ventilator pump is WELDED shut.

It looks factory, The tractor was running fine till recently. I am at a total loss as to any purpose for this at all with it being welded shut.

 

[Bob Bancroft]

I guess it still runs fine?

Yes. I assume the pump was some engineers idea of positive crankcase ventilation. A crankcase will ventilate itself just fine given a vent. Some small engines have a reed which acts to create a little vacuum in the crankcase, assuring there is no pressure build up.

 

[wore out]

I disconnected the pipe that goes to the top of my JD 3010 gas tractor, crankcase ventilator pump and cranked my tractor, Oil started coming out of it.

I do not believe this is suppose to happen.

Can y'all please explain what a Crankcase ventilator pump is, what it does and how it is suppose to operate?

Thank You, in advance.

The short version is that in the day the tractor was made crankcase oil wasn't advanced as it is today and forced crankcase ventilation was more important.

The vaned rotor in the ventilation pump (part of the gas engine governor) partially submerged on crankcase oil drew in clean air from the tube after the air cleaner and pumped it into the crankcase, pushing combustion vapors overboard though the "road draft tube" hanging down from the valve cover.

If the oil return port from the vent pump clogs or the engine air intake is severely restricted crankcase oil can wind up in the carburetor.

HOWEVER, you state that the tube to the vent pump has been "welded shut" so whatever may be or not be going on with the vent pump is a moot point and is NOT the cause of the issues you are having with your engine.

 

[Texgasser1]

The short version is that in the day the tractor was made crankcase oil wasn't advanced as it is today and forced crankcase ventilation was more important.

The vaned rotor in the ventilation pump (part of the gas engine governor) partially submerged on crankcase oil drew in clean air from the tube after the air cleaner and pumped it into the crankcase, pushing combustion vapors overboard though the "road draft tube" hanging down from the valve cover.

If the oil return port from the vent pump clogs or the engine air intake is severely restricted crankcase oil can wind up in the carburetor.

HOWEVER, you state that the tube to the vent pump has been "welded shut" so whatever may be or not be going on with the vent pump is a moot point and is NOT the cause of the issues you are having with your engine.

Interesting. Now I realize it is not causing my current problems. But once I get that straightened out, Would reopening that tube make the engine run any different, than it did?

 

[wore out]

Interesting. Now I realize it is not causing my current problems. But once I get that straightened out, Would reopening that tube make the engine run any different, than it did?

I see no reason to change from how things are now, and even if you did (once other problems are solved) it wouldn't make any difference in how the engine would run at that point.

 

[Texgasser1]

I see no reason to change from how things are now, and even if you did (once other problems are solved) it wouldn't make any difference in how the engine would run at that point.

OK, Appreciate that.

 

[craigco]

I think at some point the ventilator pumps were deleted or plugged per a JD bulletin when engines were rebuilt.