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  1. #1

    Join Date
    Jul 2011
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    DALLAS TX
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    785 cracked piston blown head gasket

    ok so lets start off by i have always had problems with these piston and rings the wsm 750 ones well this is now a super failure i have had one already crack on me and within the first hour of lake time it might have happended before the lake actually but oh well

    so my biggest question is do i order standard pistons and of what make im done with the wsm pistons!!!!!!!!!

    my plating was new hasent been bored or honed who should i send them to to find out if they can be cleaned up and order a larger piston or what my best bet is going to be
    im like 1000% positive i dont need to have them all replated

    so no i had a head gasket failure i'm blaming this failure on that it failed on the intake side of the motor on the PTO

    but the other 2 pistons have cracks on the skirts just like the first piston i took out!!!!!

    so now im trying to upload lots and lots of pictures i havent pulled the crank shaft out of the cases my puller is at my shop so im at a halt on that

    i also happen to hate the website only when it comes to uploading pics


    i have pictures of the piston wash but they wont upload if one of yall want to toss all these pics on one it would be great!!

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    Last edited by wayneb2510; 07-06-2014 at 06:06 PM.


  2. #2

    Join Date
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  3. #3

  4. #4

    Join Date
    Jul 2011
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    DALLAS TX
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    197
    so this all basically boils down to what caused this which ill say is a bad set of pistons/and headgasket..

    now what do i do where do i send my jugs and who do i order pistons from

  5. #5
    Banned User
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    Jun 2010
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    Milwaukee WI
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    That looks like all of the damage was caused by water intrusion. I don't think it was the piston's fault.

  6. #6

    Join Date
    Aug 2006
    Location
    Homer Glen Il.
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    8,702
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    I think sbt now sells std 750 pistons or get a set of wiseco pistons and to me that cylinder was real lean and burned it down . I prefer powerseal usa for my replating

    if you go with wiseco make sure your clearance is set at six thousenths
    Last edited by 785 lugs; 07-06-2014 at 07:21 PM.

  7. #7

    Join Date
    Jul 2011
    Location
    DALLAS TX
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    197
    alright can i get the plating bored or honed one time or im i looking at replating all three jugs

    im pretty sure it was water intrusion aswell on that one cyl but all three are cracked and that means iv now cracked 4 wsm pistons

  8. #8

    Join Date
    Aug 2006
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    Homer Glen Il.
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    if you go with wiseco's you need to replate all of them ,seems like other guys have had problems with the wsm pistons as well

  9. #9

    Join Date
    Jul 2011
    Location
    DALLAS TX
    Posts
    197
    ok so recomendations on a brand besides weisco? I dont feel the plateing is damaged enough to spend that money again i do know i need to have it honed out or bored or however u take care of the coating

  10. #10

    Join Date
    Aug 2006
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    Homer Glen Il.
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    there are no other available except sbt now

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