kohler command lash adjustment

Discussion in 'Mechanic and Repair' started by Eric1, May 18, 2014.

  1. Eric1

    Eric1 LawnSite Member
    Posts: 91

    Hey, I recently got a fixer upper mower that has a kohler Command cs20 verticle shaft engine on it. This kohler has hydrolic lifters. Whenever I adjust the lash the rocker arms end up falling off when I start it and one of the push rods get bent. Ive never worked with this type of problem on any kind of engine, so sorry if I ask a lot of questions.
    how do you adjust tje lash an engine with hydrolic lifters?
    thanks!
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  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    You don't...... Torque the rocker screws down to 100in.lbs. and let it sit 20/30 minutes before cranking, This allows the lifters time to bleed down so the valves don't hit the piston and bend push-rods......
     
  3. Eric1

    Eric1 LawnSite Member
    Posts: 91

    The engine didnt start up when I did that. The carburetor flamed out. It kept on backfiring as well.
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  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Did you replace the bent push-rods ?

    Did you leave it sit like I said before trying to start it ?
     
  5. Eric1

    Eric1 LawnSite Member
    Posts: 91

    Yeah, it sat overnight, cause I had to recharge the battery. I do replace bent pushrods.
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  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    When you did that was it before you had the push-rods fall out or after ?

    What was the reason for even fool'n with the valves ?
     
  7. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Posts: 4,133



    Opps I must have got lucky. I adjusted our command 25 (dang head gasket!) like a small block chevy. finger tight until you cant turn the pushrod then a half turn preload. It has been fine for 3 years now :laugh:

    Rob you dont happen to have access to hydro gear manuals do you? I need a part number for the o rings on the bypass valve or the whole valve itself. I started a thread on the leaks but it looks like it is on page 2 now.
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

  9. Eric1

    Eric1 LawnSite Member
    Posts: 91

    I took the head off the engine because the previous owner didnt take care of it at all. He rarely (if ever) changed the oil. Surprisingly, the cylinder didnt have any scratches in it. Ill probably have to replace the rings. I dont have any problem with the pushrods falling out when I tighten the rockers, but it won't start when I tighten them.
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  10. BigFish

    BigFish LawnSite Gold Member
    Posts: 3,157

    Sounds like you need to get ya a service manual! http://www.kohlerengines.com/manuals/landing.htm
     

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