Another problem in a month. Took the head out to inspect the leak as the plugs had sign of water. Found out all the o rings were melted after only 4-5 rides in one month. Last rebuild I didn't order the set from ADA but used the o ring from hydraylic shop here. Was it about quality of the o ring? This time I'lll put the ones from ADA but afraid that it'lll elt down again.
Super Jet what is the cuase of o ring head melt down?
- Thread starter kabaraka
- Start date
Tyler Zane
Open Your Eyes
- Location
- Panama City Beach, FL
:eek2:what are the o rings made out of that you where using?
For the domes you need to use viton or other high-temp material. Mcmaster sells them way cheaper than ADA.
Even though it's water cooled, you have to realize the temperature of the metal at the combustion chamber side is probably 1000F+ and the water jacket side is 100-150F depending on your cooling setup, so in the middle it's going to be much hotter than a regular rubber o-ring can handle. Also, the o-rings aren't the main seal, it's the metal surfaces being flat.
Even though it's water cooled, you have to realize the temperature of the metal at the combustion chamber side is probably 1000F+ and the water jacket side is 100-150F depending on your cooling setup, so in the middle it's going to be much hotter than a regular rubber o-ring can handle. Also, the o-rings aren't the main seal, it's the metal surfaces being flat.
Mark44
Katie's Boss
- Location
- 100% one place
Buna-N is good for +250f plenty for your head seal. Viton is good for +400f over kill yes but for the price difference why not. Viton is just a little bit harder than Buna.
Mark44
Mark44
stanton
High on jetskis.
- Location
- atascadero,ca
Warped head, worn shell/domes, dropped sleeve. I would guess your getting blowby out the dome causing the rubber to burn. The oring does not provide the seal! Get new domes.
Tyler Zane
Open Your Eyes
- Location
- Panama City Beach, FL
i would try the mcmaster carr orings before i bought new domes. i use the burna ones from mcmaster carr and have zero problems
the part numbers are in here some where. http://www.x-h2o.com/threads/31581-The-Official-McMaster-Carr-Part-Number-List
the part numbers are in here some where. http://www.x-h2o.com/threads/31581-The-Official-McMaster-Carr-Part-Number-List
Mark44
Katie's Boss
- Location
- 100% one place
t
I am with stanton on this one. You need to check the head and domes for flatness.
Mark44
I am with stanton on this one. You need to check the head and domes for flatness.
Mark44
- Location
- Houston/Galveston
- Location
- central florida
Yes, they're the same