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Kohler CV20S blowing smoke big time

Discussion in 'Mechanic and Repair' started by ed2hess, Jun 19, 2013.

  1. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 13,833

    The history is that 2 years ago I put a short block in this unit. Recently I discovered it had a leak on one head gasket. This unit is propane so I pulled everything off and replaced the head gasket. Took it out for a run and after about 4 minutes it was blowing smoke out of the muffler big time.

    It was also leaking oil out of the top of the valve cover due to the fact
    I damaged the breather seal when I put it back. Fixed that but again
    after about 4 minutes big time smoke.

    Got a gage to measure vac at dipstick and it is -10 initially then about -5 when it is blowing smoke.

    Oh before I put on headgasket it was not using oil or doing any smoking.
    Pooh hoo another rockie error.
  2. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,283

    Thats a pretty unique problem...runs for 4 minutes and starts smoking..
    I've seen this a few times...
  3. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,283

    OK...guess you want the answer...
    Sounds like the valve cover is filling up with oil...due to a blocked or plugged oil drain in the head..
    When the oil level in the valve cover reaches the valves..It'll smoke ..
    Remove the valve cover and push a wire thru the hole...make sure it goes all the way thru...
    Hope this helps...

    ( I aint never gonna catch up with RestroRob by giving the answers in one post...)
    Last edited: Jun 20, 2013
  4. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 13,833

    I ran a small wire though that hole and it seemed hard but went in about 7 inches. Tried a larger wire no go so I buttoned it up. Started it up and it smoked big time but .....it STOPPED after a short time and I think it may be fixed. When I pushed the wire in ....isn' there a reed somewhere? Anyway I will keep fingar crossed and thanks a lot:clapping:
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,283

    The wire should have gone thru pretty easy...shouldn't be anything to hit until the piston skirt depth in the crankcase..
    Crossing your fingers never hurts...

    BTW...on vert engines..the reeds are located between the lifters..

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