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o rings in head keep blowing?

S

ski569

Member
I have an 2010 m8 pg with 09 head and every time i make a long pull the o ring in head blows out and starts leaking. It's happened 3 times now,at first i thought i pinched it but after doing it my self and then the cat dealer in larimie and cooke doing it there has to be something else. I'm running 8# with 3-4 gallons race fuel. Do they make heavier o rings or could head be warped anybody have this happen or have any oring ideas? thanks.
 
Don't know if this has anything to do with it but when I was running RKT's head I kept blowing O-rings because some of his head's would allow the dome inserts to move while running. Is your head a Stock 09??? and do both blow or just one side???
 
It is a stock 09 head no inserts and so far its allways the mag side and the 09 head had about 500 miles on it but no issues with it on the old sled.
 
It is a stock 09 head no inserts and so far its allways the mag side and the 09 head had about 500 miles on it but no issues with it on the old sled.

Next time you have the head off measure the height of the cylinders to see if they are the same length.

If they check ok and you think the head is warped, you can get some fine grit sand paper (600-1000 grit). Lay it on a piece of glass grit up. Then slide the head surface around on it . Look for any spots that don.t have sanding pattern. You should see the warped or low spots if there are any.

Good luck
 
Thanks, i talked with dale at cutlers and he told me he hasn't seen this maybe 3 times in a 1000 sleds. Told me to have someone help put head on to make sure it doesn't roll and try it again so thats what in going to do. If it happens again to do the sand paper trick, but he said everyone has a bad day, i just hope that 3 people had a bad day and it works this time. THANKS.
 
Next time you have the head off measure the height of the cylinders to see if they are the same length.

If they check ok and you think the head is warped, you can get some fine grit sand paper (600-1000 grit). Lay it on a piece of glass grit up. Then slide the head surface around on it . Look for any spots that don.t have sanding pattern. You should see the warped or low spots if there are any.

Good luck

Lay a straight edge across both cylinders and make sure everything if perfectly flat and true. Someone could have torqued the cylinders down wrong and one cylinder is tipped a degree. Is it always the same cylinder and in the same place?
 
When you have it apart it might be worth pullng the cylinders and installing a new base gasket. Something might have gotten under one of the cylinders and it is tipped, like diggerdown said.
 
Thanks for the help i put a new set in every time and this time i had bolts started and held up so a friend could see orings while i pushed it tight so hopfully it holds this time. I did take a staight egde and check to see if both cylinders were same hieght and they were. It does look like there might be a little spot on head where it washed but going to give another try, if it doesn't work i'll try the sand paper trick.
 
It's always the inner oring and the sled has only 120 miles on it other than putting on head motor has never been touched. It only had 20 miles on it when it first happened. Could running it with a leak cause it to wear a spot in cylinder or head? I started to smell antifreeze at about 25 miles, i was climbing at 8-9#s of boost,stoped and checked coolant level and was down only 1 inch tops but had compression in bottle so i shut it down and put new orings in and 20 miles later on a long pull it does it again. Then goes 80 miles and making a long pull and happens again so i'm thinking maybe the compression pitted it or something. I cant feel anything but u could see where it was blowing by.
 
I cant feel anything but u could see where it was blowing by.

Ooh Ooo

Starting to sound like the top of your cylinder may have a defect or dent or???

I assume you are talking cylinder when you mention that you can see the blow by trail??

You may need to describe it in a bit more detail.
 
If you keep losing the inner o-ring it is almost for sure detonation. You are not using high enough octane fuel for your boost or you are not flowing enough fuel. I had this exact scenario happen to me and it was hard to believe because my a/f gauge always said I was good, I definately did not have an octane problem because I was running straight 110 so it ended up being a fuel supply problem. I was maxing out the upgraded in tank pump. I put stock pump back in the tank and ran a second high pressure pump after it. Never another O-ring problem and it only took 3 times eating O-rings to figure it out.
 
When i took the head of the last time i could see a wash line where it was blowing threw. But i asked the guy in cooke city after he fixed it if it all looked good and he said it did. He said that he had one blow 3 sets in a day over thanksgiving and they put a set of mister gasket heavy duty orings in it and it fixed it. I called dealer where i live and he hasn't heard of any other gasket sets other than cat. I'm looking for options if it blows again besides buying a new head or cylinders.
 
The stock o-rings are not the problem. I have been running arctic cat turbos for 4 years with much more boost on stock o-rings. You are having a detonation problem which will eat o-rings. What does your a/f gauge say under full throttle? It could be that you are just a little lean, not enough to sieze but enough to detonate.
 
I have 50% 110/91priem. at 8# 9000 ft no codes, plugs look good, 1150-75 on boost. Only one side and pistons look like new. I apriecate the help and i'll put some more octane in and check pump out put. Thanks
 
I use to have a m1000 that we put a big bore on and I had the same problem. when the head is off make sure the groove that the o-ring sits in goes allthe way around the cylinder for some reason my cylinders had the groove all the way around except for about 3mm. Not saying this is your problem but sAme result
 
It's a boonedocker pg 2860 turbo no intercooler set to 00.0 ebc so just running actuater minimum witch last time i looked was 7.8#. I took all the extra points out after it took out first oring. I started with 3-4 gallons 110 to tank full 91, 20 miles oring goes out get it fixed and put 2 more gallons of 110 no 91 and from that point on mixing pretty close to 50/50. I do have oil injection delete.
 
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