cooking the head??

[tilleryrat]

Group K suggest cooking the head when installing a new head gasket (heating it up 2 minutes running no water and retorque the head). My question is with my stock pipe, how do you re-torque the head with the exhaust bracket all up in the way? I want to do this procedure correctly, but thats allot of work just to re-torque the head bolts. Is it necessary, or does anyone else do this?

 

[restosud]

if you use a mls gasket there is no need for it.
if you use a fiber gasket then it's better you do so.
in either case it doesn't hurt to do it.

 

[tor*p*do]

Just torque it, run it and at the end of the first day check torque to make sure it is still in spec. no big deal

 

[tilleryrat]

but I can only get to 7 out of 10 bolts, the other 3 are covered by the exhaust bracket, which means taking off a good bit of the exhaust.

 

[tilleryrat]

I used a cometic gasket, it has the inner metal rings, but looks like fiber everywhere else, would this be considered mls?

 

[restosud]

fiber gasket it is.now you know what you need to do!yummy fun.

 

[tilleryrat]

ugggghhhhh! but thanks

 

[Waternut]

It kinda makes sense to cook it to warm up the metal so it conforms to imperfections better but wouldn't cooking the head make it contract when it's cool and therefore loosening it and making it more prone to leaks? I mean the little imperfections is exactly what the gasket is for. I would think if anything, you'd want to freeze it so it contracts and then expands under the torqued studs after you've installed it.

 

[restosud]

It kinda makes sense to cook it to warm up the metal so it conforms to imperfections better but wouldn't cooking the head make it contract when it's cool and therefore loosening it and making it more prone to leaks? I mean the little imperfections is exactly what the gasket is for. I would think if anything, you'd want to freeze it so it contracts and then expands under the torqued studs after you've installed it.

the gasket compresses with pressure and the heat.not the head.
you are doing this on purpose right?

 

[tilleryrat]

supposedly you retorque afterward, because if you do this procedure I think twice, the head gasket will compress approximately 90%. Just what I've heard.

 

[Yohns Kustom Fabrikation]

This wouldnt overheat the motor?

 

[restosud]

no.you're just warming it to operating temp.then let it cool and retorque.

 

[#ZERO]

I'd never run the engine for two minutes without water going though it.

Re-torquing the head while the engine is hot makes sense.

 

[Yohns Kustom Fabrikation]

Exactly what I was thinking. It doesnt take that long for the engine to get hot without water circulation.

 

[tilleryrat]

directions from Group K..... Start engine run for 2 min. or until cylinder case is too hot to touch. Let cool for 20 min. Run again for 2 min. Let cool for 20 min. and retorque to 20 ft.lb. I did this and I had no compressing, they were all still good from the first time. ???? At least I can say I did it according to their directions.

 

[750SX]

just ride the thing for 30 minutes, let it cool for a few minutes and retorque it at the lake. It's really not a big deal.

 

[cmeripper26]

Agreed. The head will get hot enough after a 20-30 min ride where you will generate enough heat at the head to where you can re-torque at this point. I never run a ski dry for 2 minutes.

 

[steve-uk]

running a ski dry for 2 mins sounds scary to me, even running for 2 mins with a flush kit attached is questionable... IMO

 

[kevbo]

No wonder so many skis have rusty cylinders and cranks. Rev it till the overheat sensor shuts it down when you are finished for the day or else your crank will rust.