Kohler Command Twin 20 HP drinking oil, solved

Discussion in 'Mechanic and Repair' started by mcambrose, Jul 17, 2008.

  1. mcambrose

    mcambrose LawnSite Senior Member
    Messages: 518

    I have a Walker 2003 model GHS with 20 HP kohler. Less than 300 hours. It started gulping oil. About 3-4 ounces per hour. Motor had been babied and synthetic oil used except during break-in. The front cylinder spark plug was very oily. I replaced what seemed to be a bad head gasket on this cylinder. I tried the mower and the oil burning didn't slow down. I talked to Kohler and they said to take it in to the shop for diagnosis using a leakdown test and compression test. My mechanic called and said the vacuum was low (4) and he suspected a faulty reed valve. He replaced the part and said the vacuum came back up the normal range (10). The exhaust doesn't smell like oil any more. The repair was only $45. I was so happy. I hope this helps someone else with similar problem.

    TOOMUCHWALKING LawnSite Member
    Messages: 171

    Where is this reed valve ?
  3. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    The only one I can think of is part of the crankcase vent
  4. joe the lawn guy

    joe the lawn guy LawnSite Senior Member
    Messages: 523

    i'm replacing my head gasket tomorrow dose anyone know about this reed valve ? if so where is it i have the same thing happening so i would like to only take it a part once thank you all for the help :)
  5. mcambrose

    mcambrose LawnSite Senior Member
    Messages: 518

    It is on top of the engine, according to my mechanic. I do not recommend changing any head gasket, until you do a vacuum test to try to identify the problem. I changed mine twice and it was not my problem. My mechanic said he did vacuum test and got a reading of 4 (i don't know the units), but that it was supposed to read 10. He changed the reed valve and it increased to 10 which was normal. He only charged $45, so it couldn't have been hard to do. Call Kohler factory tech and he will be glad to answer questions 920.459.1579 select 1
  6. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,190

    Why would anyone dig into an engine WITHOUT THE PROPER MANUAL ?????
    In most cases you can get all the tech. info ya need at the mfg. website!
    Kohler has a good tech site. Log in as a guest.
    Oh, thats right, I forgot...... ya don't have a 'puter!!
  7. joe the lawn guy

    joe the lawn guy LawnSite Senior Member
    Messages: 523

    thank you i will do a leak test today and than call them :)
  8. joe the lawn guy

    joe the lawn guy LawnSite Senior Member
    Messages: 523

    big fish i have been on there site
    not much info there. as for why the loco mower shop told me that's my problem. so i didn't know you know it all . because your just the designer of the motors right ?:laugh:
  9. freddyc

    freddyc LawnSite Senior Member
    Messages: 578

    there should be a a hose running from the breather cover to the carb...the hose should be about 1/2 inch in diameter.

    I have a Kohler command 20hp (horizontal shaft) and to change the reed (underneath the breather cover) you need to dis-connect the governor from the cross shaft to get it out of the way.

    You should replace the gaskets while you're in there. Some of th reeds have been upgraded so check to make sure you have the updated model.
  10. bigmower1

    bigmower1 LawnSite Member
    Messages: 158

    Th reed valve is on top of the engin , but you must take the cover off under the carborator to get to it and it isnt necessary if your just replacing head gaskets.

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