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Seadoo Rotary Valve damage - Advice needed
Hi Folks,
I'm helping a friend fix his 1990 Seadoo SP. I've found the problem that was causing a binding and clicking (popping) noise when the crankshaft was manually rotated clockwise.
My question will be whether the damaged crankcase can be reused. Can they be resurfaced? I know the rotary valve clearances are very important, so I
have my doubts. Definitely need a new rotary valve.
Several photos of the damage can be viewed here -
http://home.earthlink.net/~powerski/SeadooSP
The obvious problem (now that I can see the rotary valve) is that the
leading edge of the rotary valve shutter is damaged, and whatever foreign
object it hit, got dragged around underneath the rotating disk and has badly
scratched the mating surface of the crankcase. I'd estimate the the 4"
diameter circular gouge is at least 1 mm deep and the right intake port has
a 2mm notch taken out of the upper side. A chunk of metal the size of a
metal thumb tack head which appears to be part of the foreign object that
caused the damage fell out from behind the rotary cover when I removed it.
It looks like the foreign object got scissored against the right intake port
edge by the spinning rotary valve.
Now that the rotary valve is removed, the engine turns freely and I can not
feel any broken teeth when the rotary shaft turns. So I'm trying to work
out where the foreign object came from. Next, I will be pulling the rotary
shaft for inspection. The popping noise during rotation is no longer there,
so the rotary shaft may be fine.
Thank you for any advice on this.
Regards,
Jono
I'm helping a friend fix his 1990 Seadoo SP. I've found the problem that was causing a binding and clicking (popping) noise when the crankshaft was manually rotated clockwise.
My question will be whether the damaged crankcase can be reused. Can they be resurfaced? I know the rotary valve clearances are very important, so I
have my doubts. Definitely need a new rotary valve.
Several photos of the damage can be viewed here -
http://home.earthlink.net/~powerski/SeadooSP
The obvious problem (now that I can see the rotary valve) is that the
leading edge of the rotary valve shutter is damaged, and whatever foreign
object it hit, got dragged around underneath the rotating disk and has badly
scratched the mating surface of the crankcase. I'd estimate the the 4"
diameter circular gouge is at least 1 mm deep and the right intake port has
a 2mm notch taken out of the upper side. A chunk of metal the size of a
metal thumb tack head which appears to be part of the foreign object that
caused the damage fell out from behind the rotary cover when I removed it.
It looks like the foreign object got scissored against the right intake port
edge by the spinning rotary valve.
Now that the rotary valve is removed, the engine turns freely and I can not
feel any broken teeth when the rotary shaft turns. So I'm trying to work
out where the foreign object came from. Next, I will be pulling the rotary
shaft for inspection. The popping noise during rotation is no longer there,
so the rotary shaft may be fine.
Thank you for any advice on this.
Regards,
Jono
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