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Harley Davidson Motorcycles : About Slobbering Oil Problems in a Harley Davidson

Harley Davidson Motorcycles : About Slobbering Oil Problems in a Harley Davidson


Hi, I’m Jeff Jannett, Certified Harley Davidson
Master Technician, with South Side Choppers, in St. Pete, Florida. Did you know that slobbering,
also known as oil carryover, is a common problem on many Harley Davidson’s, especially the
sportster family? My name is Jeff Jannett. I’m a Master Technician, with Harley Davidson,
working for South Side Choppers. Today’s discussion, oil carryover, basically, you have to look
at your engine, and divide it into one of two categories. Now basically, all engines
have to do what we call, breathe. As the pistons travel up and down inside the cylinders, they’re
displacing air. The air has to go somewhere, and it’s going to carry an oil mist with it.
You have crankcase breathers, and you have head breathers. In the early 90’s, Harley
went to a head breathing design, where the engine actually had two bolts, one here, one
here, where the heads, the breathing, actually came out through there, and they had it channeled
into the backplate of the air filter, right here. If you get misting, oil misting, or
carryover from this area, it’s usually because the bolts themselves, or the tubes, or the
channeling system, if you’ve gone to an after market air cleaner, is not fitted correctly,
or is not attached correctly, or the tubes themselves had deteriorated, and cracked,
and allowed the oil to escape. Crankcase breathers more commonly, initially, were vented right
out to the air. EPA came down, put their foot down, and said, We need to run these things
to filters, or run them back to catch cans, or so on and so forth, so if you get a crankcase
breather that’s got too much oil carryover, chances are it’s coming out somewhere on the
bottom of the bike, and you could put a filter or a catch can on that, to keep that from
misting the back tire, which could provide a dangerous scenario, or a lot of other places,
will figure out a way you can route them back into the air cleaner, from another point,
as we did on this sportster here. This was its original breathing line here, and we routed
it up to the back of the air plate. What this does, is it takes the mist, and recirculates
it back into the motor, so if you’re having any issues with oil carryover, with your Harley
Davidson motorcycle. Again remember, it’s going to be a model specific problem, and
I would recommend consulting your Harley Davidson dealer, or your favorite after market shop,
and I’m Jeff Jannett, with South Side Choppers, St. Pete, Florida, Certified Harley Davidson
Master Technician. Keep the rubber side down.

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