• This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.

Seadoo 2005 GTX 4tech engine problem

Status
Not open for further replies.

Jimmy M

New Member
Today I took the jetski to the lake and it was running fine for a couple of minutes and it totally shut down about 2 minutes after putting it in the water. It cranks but just won't start. After checking everything with no luck, i opened the cylinder valve cover and discovered that three of the Rocker arm,exhaust are totally broken. Any suggestions on what could have caused that?
I`m adding pictures of what is broken
Thank you for any help
 

Attachments

  • 2005 GTX 4TEK 005 - Copy.JPG
    2005 GTX 4TEK 005 - Copy.JPG
    208.2 KB · Views: 38
  • 2005 GTX 4TEK 009.JPG
    2005 GTX 4TEK 009.JPG
    281.1 KB · Views: 34
Last edited by a moderator:
The description of the parts is hard to follow... But are you talking about opening the rocker cover, and you can see broken valve stems... then that engine is done.

Can you post a pic of what is broken?
 
The description of the parts is hard to follow... But are you talking about opening the rocker cover, and you can see broken valve stems... then that engine is done.

Can you post a pic of what is broken?

I`m sorry two of the rocker arm r broken
Thank you very much for respond
 
I post some pic of the engine
If anyone know y they broken it work good for two years ,when i got the jet ski it had only 69 hours and now 82 hours
 
Yup... that's broken.


The only way to know if it's rebuildable is to remove the head.

But... (I know you don't want to hear this) But I think that engine is probably not rebuildable. (in an easy way)


OK... we can see the busted rockers... and by them selves... that may not be too bad. (Can't say that I've ever seen that happen) But... when they broke... and the engine was still spinning at 7000 or so RPM... what else happened??? that's the real question. Also... we have a "Chicken or the Egg" thing going on here. Did the rockers break first? Or, was it the shrapnel from something else?


I do see one other thing in the first picture. Look at the top left corner at the cam chain. It's all bunched up. So... did it break? Did the the gear on the crank break?


I have a bad feeling that the cam chain broke first, and it stopped spinning the cam. BUT... the bottom half was spinning fast. So... the valves that were still open, got whacked by the piston coming up. In turn... breaking the rockers.

So... the head needs to come off. If the valve heads got jammed into the top of the piston, and broke off clean... you may be in luck, and it may be rebuildable. If they snapped off, and bounced around... the jug may be cracked, and the head dome will be beat to hell. It's still rebuildable... but it will be very expensive.

If that's the case... the new engine may approach the value of the ski. Honistly... if that was my ski, I would part it out, and buy a new one. (Parting out a ski can make you some very good money :cheers:)
 
Last edited by a moderator:
Thank you Dr Honda you were right the chain is broken
My question is what could caused this i had this GTX for two years and i ride it for 13 hours with no problems last time the same day i replaced the oil,filter and spark plugs that day it stooped could it be overheating problem
I`m attaching one more pic
 

Attachments

  • 2005 GTX 4TEK 127.JPG
    2005 GTX 4TEK 127.JPG
    307.4 KB · Views: 25
What caused it exactly? I don't know. If it was overhating... then yes, it could have been part of the problem. When it overheats... the parts get tight, and become harder to spin.

If you remove the cam... the bearing journals will tell you if that was a problem. They will be discolored, and/or scared.


I know it hasn't been a problem with the 4-tech engines... but in many motorcycle engines... the automatic cam chain adjuster is the culprit. Either they are weak, and let the chain go slack... in turn causing the cam to "Jump Time." Or... they have too heavy of a spring, and they stretch the chain until it breaks.

Once you dig a little deeper into the engine... please post some more pics.
 
Hi everyone
Here two more pic
I got the cylinder head out valves look ok ,pistons look ok and piston walls very smooth i don't see any damage
And i can turn the crankshaft by hand and pistons go up and down very easy
The only think i dint see any oil in the cylinder head very dry is there oil pump
and how i can test that
And i dint see any antifreeze in the engine block is there water pump
Thanks for any help
 

Attachments

  • 002.JPG
    002.JPG
    312.1 KB · Views: 26
  • 004.JPG
    004.JPG
    284.5 KB · Views: 23
I think you dodged the bullet on this one.


Pull the cam and the busted rockers, and make sure none of the valves are bent. Then check the cam to make sure it's not cracked. (you may have to send it out for magnaflux) Also, check the valve guides, and the seats. If that all checks out... replace the broken parts, and put it back together. (personally, I would do a full rebuild since it's apart)

From the internals... I don't see any dents in the pistons, but, I think the chain broke first... and the valves got mashed by the pistons, and that's what broke the rockers.
 
Thanks Dr Honda
Yes i`m going to do a full rebuild now that is a part
Let See how it goes my first engine rebuild
 
Status
Not open for further replies.
Back
Top