Will your Kohler V-twin do this?

Discussion in 'Lawn Mowing' started by landcruiser, Oct 23, 2003.

  1. landcruiser

    landcruiser LawnSite Member
    from Tx
    Messages: 134

    I was looking to buy a mower with a 25hp Kohler Command (horiz. crankshaft) with just at 1300hrs on it. It cranks perfect and quick with a little choke, immediately turn off choke she idles perfect and smooth. Stab the throttle, sounds great and still perfectly smooth. Not a hint of smoke at any speed ever. BUT, remove the oil dipstick while it's running and a mist of oil is coming out, same thing if you remove the oil fill cap at the valve cover - is this normal on these engines? I always thought this meant bad rings and, thus excessive blowby but this engine seems perfect otherwise. Try your Kohler, does it do the same thing? I have no idea if this mower actually uses oil, I didn't get to mow with it yet, just ran it sitting for 15-20 minutes. What should I think about this?
  2. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,087

    I think that's normal :confused:

    I have never did that because I assumed that is what would happen.

    One indication you may want to check is the plugs. Pull them and take a look. Then put them back, crank up and run full throttle a while. Then do a clean shutoff, pull plugs and inspect again.
  3. ZX12R

    ZX12R LawnSite Senior Member
    Messages: 795

    Lol.....you are kidding,right? The motor is fine. Here's a hint to check for a good ignition land. Remove the plug and reconnect it to the boot.Hold the end of the spark plug and start the motor. After doing this,report to us as to what kind of spark you have. :)
  4. deason

    deason LawnSite Member
    Messages: 236

    :laugh: :laugh: :laugh: :laugh:

    Sorry, but that was funny
  5. EJK2352

    EJK2352 LawnSite Bronze Member
    Messages: 1,150

    The blowout mist is normal. That mist is what keeps the rocker arms lubed. The push rods are solid on a Kohler, unlike an auto engine that uses hollow push rods and oil flow from the lifters to lube the rocker arms.
  6. dvmcmrhp52

    dvmcmrhp52 LawnSite Platinum Member
    from Pa.
    Messages: 4,205

    Just noticed the other day the pressure on a 23 horse while opening the oil fill cap. I'd say it's normal.
  7. firefighter

    firefighter LawnSite Member
    Messages: 79

    Kohler motors have a pressurized crank case. When you take of the fill cap, oil should come out with the motor running.

  8. landcruiser

    landcruiser LawnSite Member
    from Tx
    Messages: 134

    Thanks for the responses. ZX12R and deason, I am confused by your responses... EJK2352,dvmcmrhp52 and firefighter - glad you have noticed what I see is normal. I have never had any experiences with these Kohler's or any motor with a pressurized crankcase that I can recall. Growing up working on cars and heavy equipment I was always taught that this "blowby" meant worn rings and to avoid the engine. Never thought of the Kohler needing the oil mist to lube the rocker arms. Let me tell you I bet it does a good job. I had this motor just barely off idle, pulled the dipstick and there was a good mist of oil coming out. This sure eases my mind about this motor. It sures goes against my teaching but that fact that it doesn't smoke one bit made me think I was wrong and I should ask those who knew.
  9. GardenTech

    GardenTech LawnSite Member
    Messages: 71

    Not sure why you would remove the oil stick while the engine is running...they do use a pressurized oil system.. have two smaller 16 hp Kohlers, one on a 8 year old machine...it does eat oil and is a little finicky to start on cold mornings, but it's earned it's keep,; when it gives up the ghost, I'll make a planter out of it and repace it with another one...
  10. landcruiser

    landcruiser LawnSite Member
    from Tx
    Messages: 134

    GardenTech, I removed the dipstick while running because I was checking for blowby. Like I stated, I didn't know these engines had a pressurized crankcase at the time. Thus my "test" proved worthless but it isn't uncommon to see people remove oil dipstick, oil fill caps, etc. while an engine is running to check for blowby. Thanks.

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