25hp liquid cooled kohler

Discussion in 'Lawn Mowing' started by bdboss, Oct 19, 2006.

  1. bdboss

    bdboss LawnSite Member
    Messages: 72

    Has anyone used Kohler's 25hp liquid cooled engine? I am looking at adding another Walker, but this used one has this liquid cooled engine. Any comments would be appreciated. What kind of life should i expect out of one of these? Thanks, Ben
  2. bdboss

    bdboss LawnSite Member
    Messages: 72

    No one has used these things?????Hmmm maybe it would not such a wise purchase then.
  3. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,087

    They just did not make their way onto very many mower applications.

    I have no idea why, as at the time they came out, the design was much better looking than the competitive Kawasaki versions. I don't think they have a track record of being a problem, at least not that I know of.

    Maybe Kohler didn't do a good job of marketing them to mower MFG's???
  4. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Messages: 4,732

    I had a liquid cooled Kohler 25hp on a Grasshopper. It was very smooth running, pretty quiet compared to the air-cooled, and seemed to have a little more power than the 25hp air-cooled Kohler I had on another Grasshopper machine. Ran them side by side, and always liked the liquid-cooled machine a little better. I had it 2 years and put several hundred hours on it with not one problem. A friend bought it, and he has had no problems with it either. Grasshopper only used that engine for a short while, as Kohler could not fulfill their commitment to deliver the engines on a timely basis. Too bad, it was a great engine in my opinion.
  5. Willofalltrades

    Willofalltrades LawnSite Bronze Member
    Messages: 1,000

    I'm runing the 26hp EFI Walker and that has more than enough power. I have not owned a LC mower so I really can't give my opinion on this particular engine. My dealer sells mostly the EFIs. Why the 25hp? I mean it looks like a solid power house for day to day use but others seem like a better investment. Take the 31hp LC EFI. It has the best of both words. lol
  6. Willofalltrades

    Willofalltrades LawnSite Bronze Member
    Messages: 1,000

    Oh its used.. how many hours?
  7. tomo

    tomo LawnSite Senior Member
    Messages: 660

    hello, liquid cooled walker would be my choice if i had it all over again ,the air cooled i would describe as only being average ,[either 25 carb or 26 efi]. Only a person who has owned a horizontal air cooled eng will know . Main issue is the air intake sucks in all debris from ground causing air flow blockage and therefore massive overheating of oil . Degraded / damaged oil, damages engine as u would expect over the long term. I was recording oil temp 285 and above when air intake was blocked by choclate bar wrapper etc.If u r going to run in warm weather 77f and above AND/OR larger decks 48ghs or 52 sd or bigger u would do well with liquid cooled .

    Liquid cooled engine maintenance is simple and must be done

    Recommendations --- pressure test cooling system every 3mths [to eng spec s]to check 4 leaks .
    Check fan operation -switching on and off and 4 reversing action operation every service or 3mths
    Check radiator cap releif pressure every 3 mths

    Every 2 years remove thermostat and reverse flush engine block and radiator with regulated comp air and tap water . Reassemble with new thermostat. pressure test of course . Install coolant at 50 % ratio with demineralized water .

    Walkers were having some issues with fans [reliability ] if this happens to u change 4 a after market fan [do not use a cheap one !] Also i suspect radiators are a fraction small as the fan control system has been changed a few times.Eg the fan operates at a low speed until required . When the fan does cut in it cycles forwards and backwards to clean the debris screen.
    [diesels operate like this so u would assume the same 4 the gas eng ]

    ''' important''' clean debris screen often -removable

  8. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,087

    That forward/reverse cycle this is neat.
    I never knew they did that on the walkers.
    That's cool.
  9. bdboss

    bdboss LawnSite Member
    Messages: 72

    Thanks for all of the info guys, I am arunnning 4 Walkers now all some version of the air cooled kohler(from 20-26). I know what you mean about over heating of the engine oil especially on the efi model. Thanks again for all of the advice

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