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02-09-2007 | 07:19 AM
#1
Thread Starter
scooted
Joined: Jun 2006
Posts: 197
Likes: 0
Ive looked around for the torque specs for an exhaust manifold on a b18c1 motor. Im talkin about the 7 header to head bolts and the 2 outside nuts. the torque specs for the outside 2 nuts is 23ft-lb. For the header to head bolts is said to be 22ft-lb. when I got here they all felt somewhat loose. Whats a "realistic spec" to follow. I know 23 on the header to head bolts was not enough to I went to 30. any thoughts? its fine with no leaks. should i leave it or back it up. I also had an extension on the wrench. does this matter?
there DC's case that makes a difference
there DC's case that makes a difference
Last edited by TheOtherDave™; 02-09-2007 at 12:38 PM.
02-09-2007 | 12:37 PM
#2
Apathy Kills
Joined: Nov 2002
Posts: 60,714
Likes: 0
From: The Left Lane
:wavey: Got your PM; I'm reposting the answer for the general public here as well.
First, dump your chiltons manual in the nearest trashbin and order the factory service manual from HELMS. From my experience, the Haynes / Chiltons manuals are absolute crap.
And from the Helms manual, the correct torque spec is 23 lb ft for all the nuts. Work in a criss-cross pattern (top-to-bottom) from the middle pair of nuts outward. The locking nuts at the ends are the very last ones to go on.
Since you've overtorqued the inner nuts, there's a possibiliy that you've crimped the header gasket. If that's the case, go ahead and replace it. Better to spend a few extra bucks rather than have a nasty (and noisy) leak develop a couple hundred miles later.
:cheers:
Originally Posted by TheOtherDave™
Originally Posted by Topend
hey theotherdave, got a question thats seriously bugging me. Ive posted a thread on it but was reading around you sound like a reputable person to ask.
I installed my dc 4-1 header. When it came time to torque the 7 bolts and 2 nut on the flange to head part, the manuals Chilton and haynes only gave me torque specs to the outside 2 nuts. it said 23 so i put them around there. the 7 others though didn't have specs so i tightened them to a realistic spec judging off the tightness of the other nuts. I came up with 30ft-lb that looked and felt right (not to tight) do you remember what you tightend the 7 header to head bolts to? thanks
I installed my dc 4-1 header. When it came time to torque the 7 bolts and 2 nut on the flange to head part, the manuals Chilton and haynes only gave me torque specs to the outside 2 nuts. it said 23 so i put them around there. the 7 others though didn't have specs so i tightened them to a realistic spec judging off the tightness of the other nuts. I came up with 30ft-lb that looked and felt right (not to tight) do you remember what you tightend the 7 header to head bolts to? thanks
And from the Helms manual, the correct torque spec is 23 lb ft for all the nuts. Work in a criss-cross pattern (top-to-bottom) from the middle pair of nuts outward. The locking nuts at the ends are the very last ones to go on.
Since you've overtorqued the inner nuts, there's a possibiliy that you've crimped the header gasket. If that's the case, go ahead and replace it. Better to spend a few extra bucks rather than have a nasty (and noisy) leak develop a couple hundred miles later.
:cheers:
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02-09-2007 | 12:52 PM
#3
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Joined: Feb 2006
Posts: 453
Likes: 2
From: SoCal
At least download the manual until you can buy it, easy to search for whatever you need:
http://www.hondahookup.com/manuals/
http://www.hondahookup.com/manuals/
02-09-2007 | 01:08 PM
#4
Apathy Kills
Joined: Nov 2002
Posts: 60,714
Likes: 0
From: The Left Lane
At least download the manual until you can buy it, easy to search for whatever you need:
http://www.hondahookup.com/manuals/
http://www.hondahookup.com/manuals/
h:Nut up, do the right thing and buy the FSM. :nono:
Personally, I take issue with the downloading of these manuals because:
1) It's a niche market already.
2) There are relatively few players who offer reprints to the public.
The FSM is worth what they charge and I don't want to see their prices go up because more people steal.
Thanks for listening...er... reading. :run:
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02-09-2007 | 03:57 PM
#6
Apathy Kills
Joined: Nov 2002
Posts: 60,714
Likes: 0
From: The Left Lane
No need to chastise yourself. :hsd:
I was just tossing in my 2˘.h:
Trying to stop the flood of illicit downloading is like trying to bail out the ocean with a teaspoon.
I was just tossing in my 2˘.
h: Trying to stop the flood of illicit downloading is like trying to bail out the ocean with a teaspoon.
__________________
:: :ToDspin: - supermod - but who gives a shit?
:: HAN Integra FAQ: If, by some miracle, yours hasn't been stolen... check it out!
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