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Thread: Engine died!!

  1. #1

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    Engine died!!

    Hey guy,

    I had a rebuild engine last year. It ran great for 2 weeks, I loaned it to a friend and the next day....down a cylinder. I had been running extra oil mixed in the gas for the first couple of tanks. The piston looks bad, PTO cylinder. Opening it up yesterday, water was in the bottom end. Where could this have come from. It must of been hydro locked. Crank is now $#@#$. It only had about 20 hours since rebuild. I don't know where to start looking for the problem. It was still running but no compression. It has a hole in the piston picture included. After cracking the engine, it must have been hot too!!
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  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That's a nasty looking piston.

    I'm sorry it happened to you.

    My guess is he rolled it, probably righted it in the wrong direction. (there's a specific direction to right a flipped ski) and emptied water into the engine.

    After he did this, he probably started the engine and WOT back to the dock.


    OR blew a head gasket and still rode it hard.

    If there was water in the bottom for only a few hours, you can spray fogging oil and try to salvage the crank before rust sets in. After the water is emptied first.

  3. #3

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    I'd bet he rolled it and ingested water also!

    Bite the bullet, fix it the right way and keep it for yourself in the future 95% of people that ride watercraft haven't a clue when it comes to how to ride and what to do and what not to do.

  4. #4
    Neal Van's Avatar
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    the 5%ers must be here

  5. #5

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    Is the crank done, or can it be rebuilt....I have a new cylinder just need new topend gasket set.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If it's not rusting, and the index is good, re-use it.

    If the bearings are rusting it needs new bearings/rebuilt.

    If the bearings are good and it's out of phase, you can have it retrued for much cheaper than a rebuild.


    I guess you need to get a good look at what you got to work with.

  7. #7

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    I have an old timer who has been doing cranks for years near me.....i'll see what he says, done a couple ski doo cranks for me in the past...

  8. #8
    Pain is fear leaving your body.... rlovebk's Avatar
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    Quote Originally Posted by jukican View Post
    I have an old timer who has been doing cranks for years near me.....i'll see what he says, done a couple ski doo cranks for me in the past...

    Crank bad, ski good. Uhg!

    (good luck to ya!)

  9. #9

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    Quote Originally Posted by jukican View Post
    I have an old timer who has been doing cranks for years near me.....i'll see what he says, done a couple ski doo cranks for me in the past...

    That'll do. see what he says. what is the ski by the way? If it's a 3 cylinder I'd bet it's out of phase for sure. A twin is less likely, but could still be out.

    Your cylinders are probably fine unless their is any cracking or breaks. Probably a light honing and new pistons or piston..

    You may even get by with just sticking a piston in it with a little honing. I've done tons of skis this way and it's worked out ok. Worked in a shop and I'd offer that as a cheap first try. Surprised how many times it worked.........for how long?? Could be 5 minutes, could be 5 years.

  10. #10

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    Quote Originally Posted by Neal Van View Post
    the 5%ers must be here
    It doesnt take long for 5%er's that visit here to learn the basics, if they just do some reading.



    In this case........Yeah, i'd bet it was a 5%er that borrowed the ski.

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