kohler 27 hp head gasket blown?

Discussion in 'Mechanic and Repair' started by EARTH5, Apr 25, 2010.

  1. EARTH5

    EARTH5 LawnSite Member
    Posts: 124

    i have a exmark laser with a kohler command sp 27 hp. the mower has a total of 350 hrs on it! i replaced the head gasket at 200 hrs ,, now its leaking again and i am ready to cash outta this toilet,I am very unhappy with the triton deck that came on it now its the motor... anyone else have this prob. or know why they are blowing?? btw i had a dealer do it so it was torqued etc...thanks, pat p.s. any one want to buy this 56'' laser w 350 hrs ?? lemme know
     
  2. mowerknower

    mowerknower LawnSite Senior Member
    Posts: 766

    It blows my mind that Kohler has not fixed there head gasket issue yet. We switched to Kawis about 8 years ago because of the Kohler head gasket problems. Then about 2 years ago started moving back to kohlers. We figured that the problem had for sure been fixed. NOPE, I bet that about 25% of the Kohlers we sell need a head gasket before they even leave the shop.
     
  3. tryingtomakeit

    tryingtomakeit LawnSite Member
    Posts: 40

    Well, Big Kaws have sticky valve guides..... It all boils down to the bean counters....
     
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    The engine has a 2yr comm warranty. Kohler only allows us to replace the bad gasket under warranty.( we used to replace both when there was a failure ) If the head was properly resurfaced and installed, you should never have a repeat failure.

    They really should add reinforcement to edges that seal the piston and the oil drainback hole (like Honda)....just my opinion...replaced enough to know.
     
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    You may want to have your dealer check to see which flywheel is on the engine . Kohler had some issues with the flywheel timing . There are 2 different flywheels on these engines. A 22 degree, and a 16 degree . If you have a 22 degree , you need to install an offset flywheel key. This problem has been linked to many head gasket failures.
     
  6. VegetiveSteam

    VegetiveSteam LawnSite Senior Member
    Posts: 297

    The offset flywheel key is for CV and CH 730s only. This 27hp has Smart Spark ignition and uses a completely different flywheel so please do not use an offset key on this engine.
     
  7. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Really should have asked for a model and spec #...

    VegetiveSteam is correct , CH740,s use a DSAI ign system.(No external SAM module as it is integrated into the coils)

    Whats in a sticker ? I have seen a few 27 hp stickers only to find a 730 setup under the cowl, allthough this mower is probably too new for that...MY BAD..
     
  8. VegetiveSteam

    VegetiveSteam LawnSite Senior Member
    Posts: 297

    I failed to ask EARTH5 a question. Does the engine ever run on or back fire when you shut if off?

    Yep model and spec would be best. The early CH, CV740s did have an external SAM. The DSAI came out in early 2007 but they used the same flywheel as the units with DSAM. The CH,CV 730 used standard CD ignition with no spark advance and uses a completely different flywheel.

    I'd also love to know where you found 730s labled as 27hp. The only mislabling I've known of was on Craftsman units and that put Kohler in the position of being named in a lawsuit that they have no guilt in.
     
    Last edited: Apr 27, 2010
  9. betmr

    betmr LawnSite Bronze Member
    Posts: 1,663

    Did you re-torque the head bolts a while after the replacement?
     
  10. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    There are a few dealers in this part of the world (which will remain nameless) that rebuild their trade-ins with whatever parts are laying around. Add new paint and stickers and top it off with a good sales job.

    CASE IN POINT
    Yesterday I had a mower the shop that was blowing fuses. The mower originally came with an EFI 26 hp (XF2600 Dixie Chopper). The cowl said CV730v , The sticker below the breather assembly said 27 HP , and it had DSAI coils, (1 of the coils was installed with a flat head machine screw) The mower was purchased 6 mths ago as a rebuilt.

    Good way to start the week...
     

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