Exhaust nuts torque


Exhaust nuts torque

Postby Kool_Biker » Sun Jan 23, 2011 4:54 pm

Hi
Can anybody please tell what is the correct torque value of the 12 exhaust nuts of the 79 Z.
I've looked in the manual and I've looked in the forum with no success.
Thanks in advance!
Aris
Aris Hadjiaslanis
ICOA # 6309
Athens, Greece
User avatar
Kool_Biker
ICOA Member
ICOA Member
 
Posts: 654
Images: 0
Joined: Sat Dec 18, 2010 6:46 pm
Location: Great Britain

Re: Exhaust nuts torque

Postby EMS » Sun Jan 23, 2011 5:09 pm

Standard torque for 6mm bolt would apply: 8-10 Nm
To be understood is the exception
To be misunderstood is the rule.
User avatar
EMS
ICOA Member
ICOA Member
 
Posts: 9358
Images: 1707
Joined: Wed Mar 05, 2003 8:55 am
Location: North East OH, ICOA 3904

Re: Exhaust nuts torque

Postby Don » Sun Jan 23, 2011 10:10 pm

I wouldn't touch them with a torque wrench

You're compressing the exhaust gaskets when you tighten them - The correct amount is whatever it takes to seal the header pipe . . . . nothing more

Wiggle the header pipe as you snug them up and leave it there - If it leaks, loosen it a tad, wiggle it some more and tighten it just a little more than the first go around. Doing it this way will enable you to use and re-use your exhaust gaskets several times. I take my pipes off the bike several times per year . . . . sometimes just so I can do a thourough cleaning of the bike . . . . and the pipes. I've successfully re-used the same set of gaskets 5 or 6 times. When one fails to seal with a 'reasonable' amount of torque on the nuts, I flip the gasket over - If it still leaks, I replace that one gasket

I never have anywhere near the maximum torque on them for a 6 mm fastener

Don
User avatar
Don
Amazing Poster
Amazing Poster
 
Posts: 806
Images: 13
Joined: Wed Apr 02, 2003 4:13 pm
Location: Biloxi, Mississippi, USA

Re: Exhaust nuts torque

Postby Will » Sun Jan 23, 2011 10:13 pm

I don't know what the torque is, because I'm not that good a mechanic. But, whether you use a torque value or do it by the feel method (yup, that's tight), check it after bringing it up to full heat. Things tend to stretch with heat. In fact don't tell anybody, but I like to tighten them a second time while they are still hot.
User avatar
Will
ICOA Member
ICOA Member
 
Posts: 193
Images: 1
Joined: Tue Sep 14, 2004 9:08 pm
Location: Buffalo, New York, USA

Re: Exhaust nuts torque

Postby EMS » Mon Jan 24, 2011 8:37 am

Don wrote:I wouldn't touch them with a torque wrench

You're compressing the exhaust gaskets when you tighten them - The correct amount is whatever it takes to seal the header pipe . . . . nothing more

Wiggle the header pipe as you snug them up and leave it there - If it leaks, loosen it a tad, wiggle it some more and tighten it just a little more than the first go around. Doing it this way will enable you to use and re-use your exhaust gaskets several times. I take my pipes off the bike several times per year . . . . sometimes just so I can do a thourough cleaning of the bike . . . . and the pipes. I've successfully re-used the same set of gaskets 5 or 6 times. When one fails to seal with a 'reasonable' amount of torque on the nuts, I flip the gasket over - If it still leaks, I replace that one gasket

I never have anywhere near the maximum torque on them for a 6 mm fastener

Don



Don, if that was the case, Honda would have made a recommendation in the service manual as to the process.
You will not reach the 8-10Nm while crushing the gasket. Once you approach the seat, the torque increases. I find it very difficult to "feel" the proper point where to stop torquing and I have seen a few studs pulled out of the cylinder heads. that's why I stick with the torque wrench and 8-10Nm
To be understood is the exception
To be misunderstood is the rule.
User avatar
EMS
ICOA Member
ICOA Member
 
Posts: 9358
Images: 1707
Joined: Wed Mar 05, 2003 8:55 am
Location: North East OH, ICOA 3904

Re: Exhaust nuts torque

Postby SanDogDewey » Mon Jan 24, 2011 10:27 pm

With the flanges on my Kerkers, they are are almost bottomed out when they start to tighten.
ICOA #6266
1977 CB750K
1980 CBX
SanDogDewey
ICOA Member
ICOA Member
 
Posts: 90
Images: 0
Joined: Tue May 18, 2010 9:15 am
Location: San Diego, CA, USA

Re: Exhaust nuts torque

Postby Kool_Biker » Tue Jan 25, 2011 12:58 pm

So it seems "feel" is the name of the game. I tried it, and seemed to work for me.
Today I started my bike, with the exhaust on, seemingly with good sealing on all 6 cylinders.
Thanks!
Aris Hadjiaslanis
ICOA # 6309
Athens, Greece
User avatar
Kool_Biker
ICOA Member
ICOA Member
 
Posts: 654
Images: 0
Joined: Sat Dec 18, 2010 6:46 pm
Location: Great Britain


Return to EXHAUSTS: What works and fits...and what doesn't.

Who is online

Users browsing this forum: No registered users and 4 guests