why no oil filter

Discussion in 'Lawn Mowing' started by Shady Brook, Sep 14, 2002.

  1. Shady Brook

    Shady Brook LawnSite Bronze Member
    from Indiana
    Posts: 1,517

    I just purchased a Toro walkbehind, 12.5 horse, and there is no oil filter. All my other walkbehinds with 12.5's have had an oil filter. Anyone with info on this?

    Thanks
    Jay
     
  2. jay


    You should be able to buy a oil filter kit for it
     
  3. TurfGuyTX

    TurfGuyTX LawnSite Senior Member
    from DFW
    Posts: 648

    Not all engines come with them standard. Did the one you looked at before your purchase have one? I'd talk to the dealer and see what you can work out. Good luck.
     
  4. Shady Brook

    Shady Brook LawnSite Bronze Member
    from Indiana
    Posts: 1,517

    Oh I see, seems odd to have no filter standard. I purchased it from an individual. Any idea how much a kit would cost? Do they still make them without filter? Strange.

    Jay
     
  5. thfireman

    thfireman LawnSite Senior Member
    Posts: 541

    It is well worth the money to install the kit. I had one that was without a filter and it only lasted 2 years. My others with filters still go strong.:)
     
  6. Jimbo

    Jimbo LawnSite Bronze Member
    Posts: 1,093

    First thing I do before buying a mower is to make sure it has a pressurized, and filtered oil system.

    Jim
     
  7. point

    point LawnSite Member
    from mn
    Posts: 23

    Oil filters are not as important as oil changes.
    As an aircraft mechanic there is not much more important to us or the pilots than the health and life of these engines.
    Many of these 6 cylinder piston engines can cost $ 20,000 to rebuild. An in depth study was done a few years ago comparing the wear of bearings and camshafts in engines with and without oil filters, ( yes many aircraft engines do not have oil filters ).
    Guess what, the engines without oil filters had less wear !! Now I should point out that the mandated oil change interval for engines with an oil filter is 50 hours vers. 25 hours without a filter. The reason of course is that the sooner you get the "fines" out the less wear you will have, apparently the microscopic fines go right thru the filter and act as a lapping compound wearing away on the sliding parts hour after hour. I should add that we are required to cut open every oil filter we remove, and almost never find anything in them. I change my own oil quite often but seldom change my filter. BTW very, very few aircraft engines have air filters. hope this helps
    -mark
     
  8. Shady Brook

    Shady Brook LawnSite Bronze Member
    from Indiana
    Posts: 1,517

    Mark

    Wow, thanks for the post, that was very enlightening. Would you suggest changing the oil twice as often as manufacturers suggest seeing how the filters may not be keeping the stuff out? I have been doing oil analysis on a PSD for a couple years, would these "fines" manifest themselves in the samples? Do you have some background in tribiology?
    Thanks a bunch, and if you know of any published info on the web pertaining to the topic, I would love to read it.

    Jay
     
  9. Jimbo

    Jimbo LawnSite Bronze Member
    Posts: 1,093

    Heres the problem.

    Many...not all...lawn mower engines without filters also do not have pressurized lubrication. I have never seen one that had a filter, and wasnt pressurized (but they probably exist)?

    The reason for pressurization is because lawn mowers are often run on side hills, and wihout pressurization critical components will not get the oil they require.
     
  10. point

    point LawnSite Member
    from mn
    Posts: 23

    Hi Jay,
    yes, twice as often is about when I change oil in my cars, trucks and small engines.
    I do not have a background in tribiology I did take a course in it years ago. My area of expertise is in bearing vibration analysis, mostly turbine engines and propellers. we do oil analysis as well although all we are looking for is a change compared to baseline, if all of a sudden we see allot more copper or aluminum we tear it down. BTW some oil filters are great, they are bypass filters they push a small amount of oil ( 2% ) continually thru a very dense filter media like as dense as cardboard, they will filter out the fines.
    -mark
     

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