Ventilator pump on john deere b

[Jason Brinksneader]

What does this do and what affects will have on tractor performance if not working properly

 

[Bob]

The oil will get contaminated with combustion byproducts a little sooner.

Probably NOT as big of a deal as it was "back in the day" before detergent oils, as the old oils did not keep sludge in suspension as well as modern oils do.

 

[johns48jdb]

probably notice smoke from around the clutch area at times. i think thats right.

 

[Lee B]

It takes blow by gases and pushes it into the air intake where it gets burned a second time. Sort of a mechanical Postive Crankcase Ventilation (PCV) system.

I doubt you'll ever notice anything in engine performance working or not. But you might see a bit more blowby coming out from around the clutch area when it's not working.

The basic idea is a very good one and that is to bring clean dry air into and through the crankcase and then burn it in the engine. This allows condensation to be removed entirely from inside the engine where it combines with acids and corrodes the engine. There really is no other method of getting rid of the normal condensation created inside of a running engine, especially when first started and cold. This leads to an issue with the length of life for an engine but there is not even a rule of thumb for this issue - just commone sense at work here.

In the 70's, PCV systems were commonly disconnected or otherwise defeated on purpose with the thinking going along the lines of "this is an EPA thingy that's NOT going to live on my car", but the truth is that PCV systems are good things and most engines since that time have them, even your lawn mower. Oil change intervals could not reach 15,000 miles today without the help of a working PCV system.

 

[DRL]

If it malfunctions, more than likely, it will pump oil into the air cleaner, if the tube from the fanshaft to the aircleaner is still intact. If it isn't, it will pump oil out and the fan will blow it all over you and whatever else in in the way. BTDT. Got the oily t-shirt.