Short block or full replacement?

Discussion in 'Mechanic and Repair' started by bmackkc, May 22, 2018.

  1. bmackkc

    bmackkc LawnSite Member
    Messages: 19

    Hello, all.

    This evening my Hustler Super-Z died while my wife was mowing. It's a 2007 Kohler Command 30, CV750. Long story short, there is no compression at all, a large oil spill on the left side of the engine, and I can also feel puffs of air coming from that area when I crank it.

    Would you agree this is likely a cracked block?

    My main question is whether I should buy a short block, or do a full replacement? Price is a concern, of course, but if there is a good reason to do the full engine, I'd do it. From a skills standpoint, I am no pro by anyone's definition, but can certainly handle a full replacement myself, and have two mechanics (one auto, one locomotive) willing to assist.

    finally, is there a better choice for an engine? Or would switching engines be more complicated?

    I'd appreciate your thoughts and advice.
     
  2. JayinKs

    JayinKs LawnSite Senior Member
    Messages: 524

    How many hours on the engine. If it has over 1000hrs I’d prob do a full replacement. If less, may go short block. Have you checked the price difference between short block and full replacement? Regardless of hours, if your only talking $500 or so I’d go full replacement.
     
    bmackkc and BrandonV like this.
  3. Walker56

    Walker56 LawnSite Fanatic
    Messages: 9,838

    Without pictures, it is hard to tell what happened. It may be a rod that let go and blew a hole in the case. If you are feeling air coming out, that is not good.
    A short block is around $941.00
    https://www.kohler-engine-parts.opeengines.com/index.php?main_page=product_info&products_id=12117
    A new engine, based on your spec, will be anywhere from $1800-$2200
    https://www.kohler-engine-parts.opeengines.com/index.php?main_page=index&cPath=781_72_151_330_413
    Here is the service manual for your engine. Look it over to see if you could handle the swap over if you choose a short block
    http://www.kohlerengines.com/engines/onlinecatalog/pdf/sm_24_690_07.pdf
    As was mentioned, total hours are a determining factor.
     
    Traveling Man, bmackkc and hort101 like this.
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,378

    Buy a new engine...it's cheaper in the long run..
    The new short block will only have a 90 warranty...and being a novice you may overlook some problems during the install.

    A new engine has a 3 year warranty..
     
  5. grass disaster

    grass disaster LawnSite Gold Member
    Messages: 3,070

    Buy new. That's a easy decision .
     
    bmackkc likes this.
  6. OP
    OP
    bmackkc

    bmackkc LawnSite Member
    Messages: 19

    Thank you...I think I'm going to go the full engine route. She only has a little under 800 hours, but I'd rather not risk there being unknown damage to head or other part not replaced with the short block.
     
  7. OP
    OP
    bmackkc

    bmackkc LawnSite Member
    Messages: 19

    I think that's the way I'm going to go. thanks for chiming in!
     
  8. OP
    OP
    bmackkc

    bmackkc LawnSite Member
    Messages: 19

    Walker 56, AES Lawn here in the KC area has this engine in their local DC for $2100. I am going to see if they will match one of the online stores. There are several offering the engine with a wide price range as you mentioned. Do you recommend any as reputable?
     
  9. Walker56

    Walker56 LawnSite Fanatic
    Messages: 9,838

    We use Tulsa Engine Warehouse or OPE engines. Both only charge a small fee for shipping (Tulsa charges $9.95). I think that the small shipping charge requires a commercial address so call and ask. I believe residental deliveries might be slighly higher since they have to send a truck with a tailgate unless you have a loading dock nearby. We have purchased at least ten engines from each vendor over the years with zero issues.
    http://tewarehouse.com/?whence=
    https://www.kohler-engine-parts.opeengines.com/
     
  10. xxl

    xxl LawnSite Senior Member
    from MO
    Messages: 385

    Nothing like all new stuff just buy a new complete engine
     

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