Ada head leaking water into cylinder. =(

[orangefinger]

22 Head 35 Shell ....O rings little grease to keep in place, normally no 1211 at all .........I had a leak with ADA torque specs......
just another option, make sure studs are in the right way otherwise you will kill the threads !!

 

[Quinc]

It could have been a newer head with older reused domes im guessing,if youve tried on 2 cylinders with same result ...ada oring heads have a very minimal crush clearance,once the dome has worn into the head and you can feel any level changes in where the dome meets the head on either surface,its really done but you can try swiveling the dome so the contact points change,also put a thin layer of 1211 on the contact areas of the dome and the head,let it dry for a day,then put them back in...once the crush clearance is off by a few hundredths the oring has no ability to stop the hot exh from blowing right through them,no matter what sealer you use on them or what torque you apply to head

i've got a bunch of these heads and the worn out ones just blow Orings hella quick or the dome spins when i try and take the plugs out. i have used some of them anyway and just have to replace Orings very often. i've never had one let water back into the cyl. are the Orings cherry or lemons when you take it apart?

Brand new 37cc domes from Jetmanic with new o-rings. O-rings all look good (64 minutes of run time) , compression is 170psi in each hole and she runs like beast. So I do not think they are leaking a lot, but enough that you can see the moisture in the cylinder when you look through the plug hole. Also the top of that piston is nice and steam cleaned.

I am going to try a little 1211 on the back of the domes, and some RTV around the outside portion of the o-ring.

Edit: I will torque the head a little tighter too. =)

 

[TheBuzzard]

a leaking Oring will look chewed instantly. it dont just leak i tiny bit without showing a feathered / chewed spot. are you even sure there is water getting in there? you have priors for making a big deal out of nothing................. like bearing to case clearances for starters............

 

[Quinc]

a leaking Oring will look chewed instantly. it dont just leak i tiny bit without showing a feathered / chewed spot. are you even sure there is water getting in there? you have priors for making a big deal out of nothing................. like bearing to case clearances for starters............

I will post some pictures of the head/o-rings when I get home. I am sure it is water. Give me a break on my priors, my only engine experience prior to jet skis was rebuilding a '62 Nova for my first car, and cranks are expensive. =P

 

[amitchell]

I like to put just a little 1211 on the dome to shell mating surfaces. When I pull my head it is always squished completely out.

Maybe torque down with a touch of 1211 let dry for 24hrs then pull head and see how much 1211 is left(if any) between dome and shell.

Def start with the feelers and straight edge.

 

[Quinc]

Took the straight edge and fe eler gauge to the head and the domes sit just a hair above the rest of the head. But I think that is because of the o-ring is decompressed around the sparkplug hole? The rest the head looks level. I was using the .006" gauge. I put 1211 on and torqued them all to 10lbs. Going to torque them the rest of the way in an hour. I also checked the o-rings again and went over them with my finger and they are in perfect shape. So maybe water is leaking in from somewhere else?

 

[amitchell]

I will go check my head, it is off right now, and get back to you.

 

[amitchell]

The domes should sit 0.008in above the shell according to my measurements. Dome thickness 0.500in and shell recess is 0.492in in depth.

 

[amitchell]

The domes should sit 0.008in above the shell according to my measurements. Dome thickness 0.500in and shell recess is 0.492in in depth.

I did just use a calliper though. no mic's in my box.

 

[Balduccimoto]

I think if there were any issues of the mating surfaces between head and cylinder then you would be blowing o-rings. Im actually going through the same thing right now. When I look in my cylinder I see evidence of water intrusion and remaining salt. Maybe it's possible you are sipping through flame arrestors?

 

[amitchell]

Took the straight edge and fe eler gauge to the head and the domes sit just a hair above the rest of the head. But I think that is because of the o-ring is decompressed around the sparkplug hole? The rest the head looks level. I was using the .006" gauge. I put 1211 on and torqued them all to 10lbs. Going to torque them the rest of the way in an hour. I also checked the o-rings again and went over them with my finger and they are in perfect shape. So maybe water is leaking in from somewhere else?

You need to f e e l e r test the cylinder as well, not just the head.

 

[Manny]

Could it come from the exaust side ?

 

[TheBuzzard]

i've seen water get in from the exhaust manifold gasket and a perfect Oring means no leaky. a chewed /worn head can be seen with the domes out, where the dome meets the shell. it will look chewed and have chatter marks.

 

[Quinc]

I think if there were any issues of the mating surfaces between head and cylinder then you would be blowing o-rings. Im actually going through the same thing right now. When I look in my cylinder I see evidence of water intrusion and remaining salt. Maybe it's possible you are sipping through flame arrestors?

Well hurry up and figure it out, then let me know. =)

 

[Balduccimoto]

Well hurry up and figure it out, then let me know. =)

It may take a while. I am starting process of elimination everytime I go out. This time I closed the top screw and opened the mid on the b pipe thinking maybe it goes back in at idle. I just been fogging oil the entire motor everytime, been doing this for the past 20 rides..

 

[Quinc]

i've seen water get in from the exhaust manifold gasket and a perfect Oring means no leaky. a chewed /worn head can be seen with the domes out, where the dome meets the shell. it will look chewed and have chatter marks.

Would you see an exhaust leak if it where the gasket? I do have brand new gaskets on everything, but will recheck torque there as well.

 

[Manny]

I dont think you would see a exhaust leek !

 

[masterblaster]

you have no water getting in through your domes if the oring has no damage,exh out the oring has to happen first,and that is easy to spot. you have either a leaking mainifold or condensation is working its way back into cylinder through the head pipe,sometimes if you run your b pipe exh really wet this can happen,blow it out when you get it out of the water and heat the ech and motor up a good bit and see if it occurs again.
Putting 1211 on the back of domes and headshell and installing the same night is waste of time,ya have to let it sit up,even then that only changes it minimally.but it does help keep a loose worn dome from shifting position and salt water from pitting the wear surface

 

[amitchell]

I would do a leak-down test if you suspect an exhaust gasket leak.

 

[orangefinger]

Here is another one for you....we once got a batch of domes with Or ring groove cut too big , the O ring did fit but not snug really loose once compressed the o -ring basically disappeared completely in the larger O ring groove took me a while to get that figured out, if you have the domes out and you have a second set of domes compare the O ring grooves, in our case it was so significant it was visible....