Home » Public Forums » GMCnet » [GMCnet] Exhaust manifolds on, quiet as a mouse
| [GMCnet] Exhaust manifolds on, quiet as a mouse [message #183798] |
Sun, 09 September 2012 19:57  |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
|
Senior Member |
|
|
I finished up the manifold installation today between soccer games. I
ended up putting it on without the center bolt as several have suggested.
It sealed beautifully with Remflex gaskets. New bolts all around
including spring bolts and new donuts. Generous anti-seize so the next
time should be easy.
While reassembling, I think I may have a theory on why the center bolt is
there. It is just for faster assembly. The center bolt hole fits the
bolt shoulder exactly. The other four are over sized. If you start with
the center bolt, the whole assembly is centered and balanced making the
other four easy to start. Without the center bolt, you have to shift it
around awkwardly. From this point forward, we should officially call the
center bolt "the optional manifold assembly bolt".
http://www.gmcmhphotos.com/photos/member-galleries/p45528-403-exhaust-manifold-r.html
Mike,
77 PB, 403
Dublin, Ohio
http://teamteets.com/GMC
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
|
|
|
|
|
|
| Re: [GMCnet] Exhaust manifolds on, quiet as a mouse [message #183803 is a reply to message #183802] |
Sun, 09 September 2012 21:20  |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
|
Senior Member |
|
|
The Remflex package says to use 20 lbs. I guess they used to say 15-18.
I did 20 then ran it through a few heat-cool cycles and then tested torque.
They are probably closer to 21-22 lbs now. I did not use any sealant
and it is not recommended. For the LH side, I torqued the center bolt to
just over 15 lbs as many have recommended here. I only have about 60
miles on it now so can't say anything about how it holds up. I am a bit
concerned that the low torque may contribute to the bolts backing out on
their own. If they do I will go for one of the manifold bolt locks...
http://www.appliedgmc.com/prod.itml/icOid/763
Mike,
77 PB, 403
Dublin, Ohio
http://teamteets.com/GMC
On Sun, Sep 9, 2012 at 10:10 PM, Thomas Mike <mthomas@wideopenwest.com>wrote:
>
>
> Mike, what torque did you use and did you use any sealant with the Remflex
> gaskets?
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Purple ex Palm Beach, 77 Royale (rear bath)
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
|
|
|
|
| Re: [GMCnet] Exhaust manifolds on, quiet as a mouse [message #183810 is a reply to message #183803] |
Sun, 09 September 2012 23:52 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
|
Senior Member |
|
|
-------------Original Message-----------
The Remflex package says to use 20 lbs. I guess they used to say 15-18.
I did 20 then ran it through a few heat-cool cycles and then tested torque.
They are probably closer to 21-22 lbs now. I did not use any sealant
and it is not recommended. For the LH side, I torqued the center bolt to
just over 15 lbs as many have recommended here. I only have about 60
miles on it now so can't say anything about how it holds up. I am a bit
concerned that the low torque may contribute to the bolts backing out on
their own. If they do I will go for one of the manifold bolt locks...
Mike,
77 PB, 403
Dublin, Ohio
-----------------------------------------------------
Mike or anyone,
The exhaust pipe has somewhat of a flex connection where it joins the exh manifold, but no where else. Yes, the exh pipe can be forced to flex a small amount, but maybe not enough for the engine movement and since the exh manifold bolt torque is minimal, could the manifolds be shifting back and forth creating wear on the gaskets and leaks?
I think that if we where to add a short section of flex pipe, one on each pipe before the "Y", giving the pipe that much more flex to match the engine flex, maybe the problem of leaks could be further reduced or eliminated.
I don't have exh leaks yet, and I'm thinking of doing the flex section. Has anyone else already done this? Please chime in.
FWIW
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
[Updated on: Sun, 09 September 2012 23:52] Report message to a moderator |
|
|
|
| Re: [GMCnet] Exhaust manifolds on, quiet as a mouse [message #183822 is a reply to message #183810] |
Mon, 10 September 2012 05:53 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
>
> I think that if we where to add a short section of flex pipe, one on each
> pipe before the "Y", giving the pipe that much more flex to match the
> engine flex, maybe the problem of leaks could be further reduced or
> eliminated.
>
> I don't have exh leaks yet, and I'm thinking of doing the flex section.
> Has anyone else already done this? Please chime in.
>
>
Yes, I have done this to both of my GMCs.
I have a flex after the y and before the frame on the side ( I will go look
for pictures)
I did this to take the flex, and pressure off of the headers.
I just told the muffler guy to do it
JimK may have the flex available
gene
>
> FWIW
>
>
>
>
>
>
>
> --
> ”When we avoid the mistakes we might have made, we sometimes make
> the mistakes that we might have avoided.”
>
>
>
> Adrien & Jenny
> 75 Glenbrook
> Yuba City,Ca.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
|
|
Goto Forum:
Current Time: Sun Oct 06 09:24:16 CDT 2024
Total time taken to generate the page: 0.00730 seconds
|
GMCforum
Search
Help
Register
Login
Home
