OMG!!!! What happened? Advice on rebuild and cause please!!!

2lick

2lick

Brap!!!
Location
Limerick, PA
Story:
I was riding at the lake.
1 gallon gas
took a break
1 gallon of gas
took a break
(I was thinking to my self this is the best this ski has ever run!!! yeah)
Then I put in 2 gallons..... I decided to go for a cruise....
I drove 3/4 gallon up the lake, pulled over to an island to check fuel level.....
decided to turn around..... in 1000 feet..... carnage.....

It lost power and sounded like it was hitting, clicking, grinding.... it was still running.... I shut it off immediately! I didn't know what the sound was.... I pulled over felt the coupler.. the rear crank seal was half out..... I sat in the water for 2 hours getting towed in, I had 2 bilge pumps on the whole time, occasionally spitting out water....

When it got onto the trailer, it wouldn't really start.... i just turned it over some trying to get the water out of the system.....

I got home and it pured rain the next 2 nights.... I have no where but outside to work....

So 72 hours after this event I got to tear it apart.. and found the following....
(see pics)
All can be found here: http://picasaweb.google.com/addicted2tech/Carnage

First I pulled the head: saw rust and water
pulled cylinders from cases: water poured out
cases are full of water
took off the flywheel cover: water poured out

I began taking everything apart any cleaning WD-40 Silicon everything i could.....

I have never had this happen before.... why did it happen...

My guesses:
Head gasket leaked water...... but the oring is not damaged.....

What now?
what all needs replaced

my list:
crank
new bore
new pistons
new c clips
new crank seals
gaskets for rebuild


Any one have any thoughts as to why this happened? Any wisdom to share?

Thanks in advance!
-NICK
 

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Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
I think the water in the motor was very likely caused by the towing. How long and fast was the tow?

Also,the flywheel area really should not have had any water in it. You MUST do a better job sealing that area, or it will come back to bite you in the ass at the most inopportune times.

The cylinder may well be fine with a slight hone to get the rust off.
The pistons should clean up with some emery paper or fine grit wet sandpaper. (Are they damaged?)
Inspect the crank and most likely replace.
 
2lick

2lick

Brap!!!
Location
Limerick, PA
So why did it break, and how did the tow in get water in my engine?


superjet0587 said:
how fast were you being towed?
Click to expand...

he towed me fast.... I was hauling it..... cause they charge by the hour.. so I told him accelerate until I fall off.... I was getting good air lol.....

grifnasty said:
mabye you were running lean, combined with rust... how long were your breaks?
Click to expand...

my breaks where like 30 minutes plus......

i was going 1/4- 1/3 throttle.... the whole run... i was just cruising like slow.....
lean.... i dont think...... but um....

Matt_E said:
I think the water in the motor was very likely caused by the towing. How long and fast was the tow?

Also,the flywheel area really should not have had any water in it. You MUST do a better job sealing that area, or it will come back to bite you in the ass at the most inopportune times.

The cylinder may well be fine with a slight hone to get the rust off.
The pistons should clean up with some emery paper or fine grit wet sandpaper. (Are they damaged?)
Inspect the crank and most likely replace.
Click to expand...

It was a brand new flywheel gasket, plus some sealer, plus JSS gromet, plus silocone.... what else can I do....

pistons dont look damaged....
but do i need to put in new rings.... these are already on there second build...
Crank is still wet.... no way I am going to trust it..... I will replace it....
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
The towing + water intrusion has been discussed multiple times before.
The water forced through the pump forces water into the cooling system, into the pipe & waterbox, and fills your engine.
The faster you tow, the worse it gets.
I guarantee, that's where the water came from. I'll bet 50 bucks on it.

As for sealing the flywheel area: Make sure you grease the starter top, the gasket (both sides) , and the grommet. That should do it.

I would inspect the rings, and most likely just polish them with some emery paper and reuse them and the pistons.
 
2lick

2lick

Brap!!!
Location
Limerick, PA
Matt_E said:
The towing + water intrusion has been discussed multiple times before.
The water forced through the pump forces water into the cooling system, into the pipe & waterbox, and fills your engine.
The faster you tow, the worse it gets.
I guarantee, that's where the water came from. I'll bet 50 bucks on it.

As for sealing the flywheel area: Make sure you grease the starter top, the gasket (both sides) , and the grommet. That should do it.

I would inspect the rings, and most likely just polish them with some emery paper and reuse them and the pistons.
Click to expand...


hmm i must have missed those threads.... darn

thanks ill try more goo......

Idok said:
is it just the angle of the pix that makes the cases look like its mashed against the left side of the flywheel?


also looks to me like your rear crank seal was not installed properly..

Idok also make sure to soak that bendix in penetrating oil or ATF for a couple of days at least...
Click to expand...

what is the proper way.....

I have another to replace it with.....

________________________________________________________


great info guys.. i wish i wasn't so retarded...... its costly......

any one know anyone in the Durham, NC area to do the hone... and i need a vice.... darn....

How can I measure to ensure the pistons and rings are still ok for the holes.....
 
crammit442

crammit442

makin' legs
Location
here
I don't know if I'd get too freaked out looking for a really technical explanation. It sounds like you just blew a seal. Use OEM yamaha only and make sure they're in right. Two hours floating is plenty of time to get water in the motor towing or not. If the crank stayed immersed in water, it may be fine. I wouldn't throw it out because it was wet. Look for any rust on the bearings. If there isn't any rust lube it up and use it. The comment that the front seals will only hold 6 psi is incorrect. I always test my motors at 8-10 psi and the seals have never blown out. I've even accidentally gone up to 12-15 psi with no problems.

Charles
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Durr....I should have thought of that. Pressure testing is done above 6 psi.
 
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