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Message started by df0518 on 04/28/13 at 11:24:49

Title: Exhaust header bolt torque specs
Post by df0518 on 04/28/13 at 11:24:49

Guys, can you please tell me what to torque the exhaust header bolts to?
I see in the torque spec sheet it lists Exhaust pipe clamp bolts as 9.6 - 11.8. are these the same bolts? I am performing the dyna muffler swap on a 2008 s40 and plan on loosening the header pipe.

Title: Re: Exhaust header bolt torque specs
Post by justin_o_guy2 on 04/28/13 at 12:02:00

I couldnt tell ya. I dont mess with the torque wrench there. I use a 1/4 ratchet,w/ extension,( sitting facing the rear of the bike on the passengers side, ritght hand holding the tools) a rather short one, & put my thumb on the head of the ratchet & with the handle across the palm to the open fingers, si close the fingers, gently. Never grip the ratchet & use the arm. Go slow. YOull feel the thing start to snug up, because youre tightening it in a way that isnt stronger than it is. If you grabbed a 1/2 ratchet & just started cranking on it with both hands, youd never even feel it come tight before it was stripped. This way, you can feel it go from loose, to just snug to offering more & more resistance. Dont go to the place where your thumb is on the head of the ratchet & your fingers are open but curled & gripping & use that arm. Just use your hand & youll get it tight enough.

Title: Re: Exhaust header bolt torque specs
Post by Serowbot on 04/28/13 at 12:12:34

That's a compression gasket in there,.. so yer' not trying to seat the bolt... just put compression on the gasket... if the bolt seats, you need new gasket...
It will loosen over time,.. make checking it, part of your oil change routine... but, don't try to make it tight enough not to come loose...
That's a steel bolt going into soft aluminum...
I always put anti-seize on those puppies..

Title: Re: Exhaust header bolt torque specs
Post by justin_o_guy2 on 04/28/13 at 12:22:11

I knew I forgot some details. Rowboat is exactly right. If you feel the bolt "Land" & start clamping steel to steel parts, your compression gasket is 100% compressed & youre gonna be needin another one, Id say when it gets loose again. & Yup, if you own a motorcycle, you Need to own a jug of antisieze. Much better to be snugging those up once in a while than realize theyre corroded in place on the day you want to pull the header.

Title: Re: Exhaust header bolt torque specs
Post by df0518 on 04/28/13 at 18:50:50

Thanks for the help. I was gentle. Had no problems.

Title: Re: Exhaust header bolt torque specs
Post by Digger on 04/28/13 at 19:24:18

FWIW, the book says 13-20 ft-lbs for those bolts.

I use 13 ft-lbs, on a cold engine.