piclist 2008\08\18\160422a >
Thread: Jet ski -- possible ways for the water to get in the engine?
www.piclist.com/techref/index.htm?key=jet+ski+possible
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face BY : Dave Tweed email (remove spam text)



Vitaliy wrote:
> This is a continuation of the [EE] thread with the same subject.
>
> Carl Denk said:
> > Pictures would be worth a 1000 words. :)
>
> http://www.maksimov.org/jetski/
>
> Would love to hear your thoughts!

The valve failed first, from fatigue and/or corrosion, with the valve head
separating from the stem. There's no way that this failure is the result of
water getting in the cylinder first. The valve head bouncing around inside
the cylinder caused all the other damage, including the smashed spark plug.

My guess is that the water ended up in the cylider(s) because the broken
valve occasionally "wedged" the head away from the block -- you can see
the forces involved from how the head and piston are marked up. The extra
discoloration around that cylinder in the view of the block is another
clue.

It would be really difficult to argue that this failure sequence was the
result of "abuse" by the renter.

-- Dave Tweed
<E1KVAxf-0003IP-4M@elasmtp-kukur.atl.sa.earthlink.net> 7bit

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