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oil spray out of kohler

Discussion in 'Mechanic and Repair' started by 97firebird, Oct 16, 2004.

  1. 97firebird

    97firebird LawnSite Member
    Messages: 41

    My kohler has a rubber tube that comes out of the front of the engine and up into the bottom plate that holds the air filter on top of the carb. It has been blowing oil out of it in a spray almost constantly...this covers the inside of the air filter and the plate around the top of the carb with a nice layer of oil. Why is there oil comming out of this tube? What is the tube supposed to be for?
  2. dlovett

    dlovett LawnSite Member
    from West KY
    Messages: 5

    I believe this tube is to vent out crankcase gasses. If you're motor is worn it probably has lots of blowby and blowby is vented through this tube. Hope this helps.
  3. sdwally

    sdwally LawnSite Senior Member
    Messages: 386

    The tube should run to a removable plate. Remove plate and inspect small disc valve. This valve should seal off breather hole to allow engine to build vacuum. Also there should be a small drain hole that allows excess oil to be sucked back into engine under vacuum. Make sure it is not plugged.
    It is not uncommon to have a slight mist of oil coming from the tube when engine is hot. But to much can signify other problems. If the engine is old, piston rings maybe leaking by.
  4. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    That tube is the PCV (Positive Crankcase Ventilation). If you are getting a lot of blow out then the rings could be going bad letting more blowby into the crankcase than normal. Have a "leak-down test" done. NOT a compression test. A compression test will not tell you must if any thing about blow by in that engine.
  5. ducky1

    ducky1 LawnSite Senior Member
    Messages: 252

    Also could be a blown head gasket creating internal crankcase pressure. What model kohler do you have?

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