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adjusting valves, what a pain

Discussion in 'Mechanic and Repair' started by toddol1971, Jun 17, 2013.

  1. toddol1971

    toddol1971 LawnSite Member
    Posts: 33

    :hammerhead::hammerhead: kawi fd731v. Worst valve adjustment I've ever done. Its all easy to get to. Easy to find tdc. Its the actual adjustment that is hard. There is a bolt that goes thru the rocker arm with a cam style bushing in between. You spin the bolt which spins the cam, which tightens or loosens the rocker arm on the valve. The problem is when you tighten it down it either loosens or tightens past the .006. It was close several times, but I dont do close. I'm ocd so someone else may not be as precise as me? Another thing. All valve adjustments I've done before, and I've done alot, always have a range. Like .005 to .007. Why not this motor? I dont know. I'm just complaining.
  2. A&R Enterprise

    A&R Enterprise LawnSite Member
    Posts: 96

    I just did this on my FH 720 v 25 hp kawasaki and it was a pain but got it done.I set mine at .004.I had problems with it starting when it was hot,so I adjusted the valves (that were way off)and now problem solved .Good luck.
  3. toddol1971

    toddol1971 LawnSite Member
    Posts: 33

    Yeah I got it done too, but I thought it was gonna be way easier. Weren't you worried about tightening it to much. I thought about .005 but didnt want to have any trouble. One of the intakes was at .008. The reason I did this was one day while mowing something just didnt sound right. I figured it was the valves. Glad I checked. I'm glad its done!!!!!!
  4. weeze

    weeze LawnSite Fanatic
    Posts: 8,897

    maybe try setting it at .005 and then after you tighten it then it will be at .006 :laugh:

    i dunno i hate valves. i'm like you and i'm ocd about it. i think it's impossible to get any valves set 100% correctly. just get them close and ur done. i would rather them be a tad tight than loose because they are gonna loosen up over time on their own. not too tight cuz kawi engines bend pushrods easily. mine already bent one at 299hrs. 1 hr before it was time to adjust the valves. :rolleyes:

    maybe aim to set it at .0055 and when you tighten it down it will be .006 or close to it.

    next time i buy a mower i'm getting a kohler so i don't have to worry about it anymore.
    Last edited: Jun 18, 2013
  5. Sharpcut 1

    Sharpcut 1 LawnSite Senior Member
    Posts: 450

    That's nothing. Wait till you try adjusting them on the new FX engines. They are on offset fulcrum you rotate and then have to lock down Major PITA!!!!
  6. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Smear a little oil on the feeler gauge before adjusting...you'll get a better read on the adjustment..
  7. BigFish

    BigFish LawnSite Gold Member
    Posts: 3,254

    'Nuther trick/tip is to keep the locking nut or screw very snug ( almost tight ) when adjusting. That way ya don't lose /gain too much on final tightening/locking. I just barely loosen the locks.
  8. toddol1971

    toddol1971 LawnSite Member
    Posts: 33

    I remember reading about that. I dont know about a kohler, I like my kwacker pretty good. My luck I'll get a kohler and the flush handle will brake:dizzy:

    Sounds like fun. Just like slamming your head with a hammer:hammerhead:

    I always do that. Its alot smoother.

    Thats how I do it. Problem was weird though. the cam bushing has a groove in it that a flat spot on the bolt goes into, locking the two together. Loosen the nut on the bottom and turn the bolt head on top. There is slack in this system though. When you turn the bolt nothing turns for a 1/16". So when you get it where you want it, tightening the nut can, and does turn the bushing just enough to flub it up. One of them things you just have to have a feeling for. Of course just as I was on the last cylinder it come a flood here. I mean just all of a sudden. Got me and my tools in the box all wet. You know it didnt rain for a week and a half, and the one 1/2 hr time period I do the valves it has to rain :clapping::dancing::cool2: :hammerhead:
  9. salvagedrover

    salvagedrover LawnSite Member
    Posts: 131

    You're looking for slight drag on the valves when adjusting them, so how do you get that when the feeler is coated in oil? I've NEVER heard of that.
  10. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    It doesn't surprise me that you have never heard of it..
    I've read your posts...not impressed...
    Don't you know the difference between friction and tension...aka slight drag..

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