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Oil Coolers

Discussion in 'Mechanic and Repair' started by lsylvain, May 12, 2009.

  1. lsylvain

    lsylvain LawnSite Senior Member
    Messages: 779

    I am wondering if anyone has experimented with some external oil coolers that have been kicked up a notch or two? I'm in Florida and my ZTR's get HOT. Too hot.

    I was thinking of adding a larger oil cooler or two smaller ones and mounting somewhere farther away from the engine. Like for example under the fender or in place of the head lights.

    Any thoughts?
  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    What brand/model units and engines ?
  3. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Uhm, I'm not too thrilled with these things, although I realize they are sometimes necessary.

    Because they're connected with rubber hoses, granted it's a special hose.
    But they can and do bust...

    My truck lost 4.5 quarts going down the road because of that.
    I fixed it by cutting off the leaking part, then closing the loop with the good part of the hose, bypassing the cooler.
    I did have two quarts with me, but even after I added this to the crankcase, nothing showed on the dipstick.

    I didn't think I'd make it home, I suppose I should have called a tow truck ($200 + several hours)
    But after I fixed it I was still sweating that engine seizing for days after...

    Good thing I run synthetic, other than the fact it cost me $30 just in leaked oil.
  4. tomo

    tomo LawnSite Senior Member
    Messages: 660

    Hi ,
    There is heaps of info on oil coolers fitted to ZTR ,do a search .

    In the industrial world coolers are fitted to most systems

    Mechanical items only fail from
    lack of maintenance
    the idiot working on the machine
    poor design

    Coolers can be made by
    Long industries [Eaton company] stacked plate no fins
    Dixie chopper and kohler use them

    There is also a aluminium cylinder with fins .U can get it in different lengths and can be easily mounted [do search ]

    Coolers also add increased oil capacity ,so AS well as cooling this also extends its life a little .Therefore at a 70 hr oil change the oil is in better condition and has protected your engine to a greater degree

    KUBOTA DIESEL company eg reduces the oil change interval when the oil sump is reduced in size . Obviously this is from the oil being :hammerhead: cycled thru to many times .

    The above occurs on the walker diesel . The diesel uses the small sump . When a replacement engine arrives it comes with a manual [interesting reading ]
    Walker oil change interval 100hrs
    Kubota 50-70 hrs [donot take mower makers word ]

    Quart is a few ounces under a metric litre of fluid
    kubota large sump 3.6 ltrs
    kubota small sump 3.1 litrs

    Using above info this puts eg kohler oil capacity to shame :dizzy::dizzy:
    [kohler 2 quarts ]
    This is why in difficult conditions the oil is then totally abused .

    The oil out of my gas walker drained out at 50-70 hrs was very very tired :sleeping: Adding a cooler rectified this

    tomo :waving:

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