kohler K-532 breather questions

Discussion in 'Mechanic and Repair' started by rbig, Jun 11, 2005.

  1. rbig

    rbig LawnSite Member
    Posts: 112

    The breather on the K-532 seems to be an external part of the governor (at least the breather valve housing is).

    How does the breather functionally interrelate to the governor?

    Where does the crankcase breather ultimately vent to?

    There is also a breather connect to the carb. Are crankcase exhaust gases split between the governor and the carb?

    The manuals provide inadequate clarification of the above for me.
     
  2. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,098

    On newer engines all crankcase gases are vented back into the carb to be burned. On older engines it was not uncommon for the crankcase gases to be vented straight out into the air. Now the EPA says they have to be vented back into then carb to be burned. I am thanking the crankcase breather has nothing to do with the governor. I will have to check a K-532 IPL but I am thanking they just happen to be in the same general area is all.
     
  3. rbig

    rbig LawnSite Member
    Posts: 112

    }}} I am thanking the crankcase breather has nothing to do with the governor. I will have to check a K-532 IPL but I am thanking they just happen to be in the same general area is all. {{{

    I think you're right. That was my initial conclusion, but I'm no expert.

    Assume you're right. The next question is: where does the breather pipe vent to? The manual tells me there is a connection to the carb, which is supposed to provide a vacuum effect for the crankcase. OK, fine.

    But, what about if you had ring wear and blowby that needed a place to get out? Do all the crankcase gases flow out through the carb? Or, is there another vent path I'm not seeing?
     
  4. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,098

    OK. Post spec number for me. Most do not hook up to the carb it's self but to the air filter housing. And if you do have a lot of blow-by it will blow oil into the air filter housing and into the carb and then be burned fouling the plugs. On older engines it just vented out on to the ground. You always had a wet oil spot on the engine or frame. Now days the EPA says that is a big NO-NO and it must be returned to the engine to be burned. If you have ring ware bad enough to cause blow-by being vented back into the intake to cause a problem with the engine running you need to replace the rings. The carb does not provide a vacuum for the crankcase. The vacuum comes from the action of the piston going up and down.The breather vent has a one-way check valve in it that lets the pressure vent but does not let air back in when the piston goes up creating a vacuum in the crankcase. The only reason you want a vacuum in the crankcase in the first place is to vent bllow-by and to prevent oil from being pushed out of the crankcse by heat and blow-by. Post spec numbers of the engine. K-532 is the model I need the spec numbers to be able to help any more. This engine came out with more styles of air cleaners and carbs than I can count
     
  5. rbig

    rbig LawnSite Member
    Posts: 112

    }}} This engine came out with more styles of air cleaners and carbs than I can count {{{

    You are so right about that. The model is QS (i.e., K-532QS), and the spec is 53131.
     
  6. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,098

    I read the K-532 manual and I see why you said what you the way you did. The wording is a little miss leading about the breather tube going to the carb.
    Below is a photo that may help you out. I should have known this was on a John Deere.

    breather tube.JPG
     
  7. rbig

    rbig LawnSite Member
    Posts: 112

    My air cleaner shroud isn't round like the one depicted. Both serve the same function, though. I'll check mine to see if there's any kind of hose connected to it from the breather valve housing. Seems like there'll have to be.

    Thanks for the info.
     
  8. freddyc

    freddyc LawnSite Senior Member
    Posts: 578

    I have a 20hp Kohler and the crankcase vent tube goes straight into the air cleaner housing (inside the air filter). I must have blow by because the bottom plate that the air filter sits on is covered with oil after only a few hrs running.

    If I leave the air filter out for a while, it doesn't seem to vent as much oil / vapor as it does with it in there. If I put my finger over the end of the tube I can feel a small pulsing.


    I was told also that if you either overfill the engine oil or do odd angle work (tilted motor) then the same thing happens also.
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    How about posting your model and spec. numbers,I remember seeing a couple breather updates Kohler put out on a new style breather assembly for the 20 and 22hp engines,This just mite be the fix for your problem.
    BTW How many hours are on this engine ?
     
  10. rbig

    rbig LawnSite Member
    Posts: 112

    My manual says that somehow the carb is supposed to supply a vacuum on the crankcase through the breather. To me that means that the crankcase gasses go into the carb, if it's being used to put a vacuum on the crankcase.

    Assuming that's true, I'm still not sure why the oil in the crankcase is so easily siphoned by the breather port down there.

    One of the things that needs to be checked out (and I'll get to that next week on mine) is whether or not the one way valve is working properly. I'm further assuming that if it's not, then it may contribute to the oil getting through the carb into the combusion chambers.
     

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