Home » Public Forums » GMCnet » Exhaust Leak (What to do?)
Exhaust Leak [message #311238] |
Sun, 04 December 2016 14:07 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
Karma: 13
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Last weekend, on my annual sand dune trip, the coach developed an exhaust leak at the engine. I had a chance to investigate a little further when I was getting ready to leave the GMCSJ Christmas Rally this morning, and discovered a substantial crack in my left exhaust manifold. I know the left ones are hard to come by, and I'm wondering if anyone has a good one available that you might be willing to part with for a reasonable price?
The other option, of course, is to install a set of headers, but that's just another large expense. I already have Jim K's 3" aluminized, two muffler, exhaust system, so the headers should be a simple bolt in installation. Being in my ninth year of GMC ownership, I realize the simple jobs are rarely as easy as we hopr they will be.
Any sage advice?
Thanks
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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Re: Exhaust Leak [message #311239 is a reply to message #311238] |
Sun, 04 December 2016 14:27 |
C Boyd
Messages: 2629 Registered: April 2006
Karma: 18
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Left side (driver) is easiest to find. 455 and 403 are same also Toronado. Cast J. Cast number 407103.
Carl S. wrote on Sun, 04 December 2016 15:07Last weekend, on my annual sand dune trip, the coach developed an exhaust leak at the engine. I had a chance to investigate a little further when I was getting ready to leave the GMCSJ Christmas Rally this morning, and discovered a substantial crack in my left exhaust manifold. I know the left ones are hard to come by, and I'm wondering if anyone has a good one available that you might be willing to part with for a reasonable price?
The other option, of course, is to install a set of headers, but that's just another large expense. I already have Jim K's 3" aluminized, two muffler, exhaust system, so the headers should be a simple bolt in installation. Being in my ninth year of GMC ownership, I realize the simple jobs are rarely as easy as we hopr they will be.
Any sage advice?
Thanks
C. Boyd
76 Crestmont
East Tennessee
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Re: Exhaust Leak [message #311241 is a reply to message #311239] |
Sun, 04 December 2016 14:59 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
Karma: 13
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C Boyd wrote on Sun, 04 December 2016 13:27Left side (driver) is easiest to find. 455 and 403 are same also Toronado. Cast J. Cast number 407103.
Thanks Chuck. I thought it was the opposite. This gives me hope.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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Re: Exhaust Leak [message #311242 is a reply to message #311238] |
Sun, 04 December 2016 15:17 |
lqqkatjon
Messages: 2324 Registered: October 2010 Location: St. Cloud, MN
Karma: 5
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Have some people swear headers are the way to go, other have told me they were not happy after changing to headers because they create so much heat that they struggle with cooking stuff uner the engine like wires, speedo cables and spark plug boots. ??
You coach is in good shape other then that drivers side manifold I think you can probably find a good manifold and stick with that.
My friends coach has headers, and I did not notice major heat problem, and actually his coach seems quieter then mine. But I stuggle with exhaust leaks too.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Re: Exhaust Leak [message #311252 is a reply to message #311238] |
Mon, 05 December 2016 07:32 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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My coaches both have headers. They're both different, I suspect the 23' ones are Thorleys and the 26' are Someone Else's. I don't see a lot of heat relatively, but I've not run a manifold engine for comparison. Both coaches have a fair amount of woven heat fabric around wires and cables which seems to protect them.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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Re: Exhaust Leak [message #311260 is a reply to message #311252] |
Mon, 05 December 2016 09:17 |
C Boyd
Messages: 2629 Registered: April 2006
Karma: 18
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Johnny, your 26 is probably a set of Mannys stainless headers. You can remove governor without removing header on his.
Johnny Bridges wrote on Mon, 05 December 2016 08:32My coaches both have headers. They're both different, I suspect the 23' ones are Thorleys and the 26' are Someone Else's. I don't see a lot of heat relatively, but I've not run a manifold engine for comparison. Both coaches have a fair amount of woven heat fabric around wires and cables which seems to protect them.
--johnny
C. Boyd
76 Crestmont
East Tennessee
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Re: Exhaust Leak [message #311261 is a reply to message #311238] |
Mon, 05 December 2016 10:05 |
Chris Tyler
Messages: 458 Registered: September 2013 Location: Odessa FL
Karma: 7
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I have coated dougs headers, and no heat issues.However Iit had them since I have had the coach so no point of comparison.
To be honest though, in other applications I have found they still radiate a LOT of heat, whereas header wraps did make a difference.in underhod temps
Ran back to back dyne results with bare and wrapped headers and saw now poer difference. However in car, I do think the drop in underhood temps helped
76 Glenbrook
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Re: Exhaust Leak [message #311293 is a reply to message #311238] |
Mon, 05 December 2016 20:16 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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This is funny to me becuase back in highschool all the hopped up cars with headers leaked and the ones with manifolds didn't.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: Exhaust Leak [message #311409 is a reply to message #311238] |
Fri, 09 December 2016 22:49 |
Phantom2
Messages: 94 Registered: September 2012 Location: Springfield, IL
Karma: 0
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Carl, find a manifold yet? I have a left you can have for shipping cost. I will try to find out how much it will be. I will need your city
Larry
Larry Hopkins
75 Avion
Springfield, IL
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Re: Exhaust Leak [message #311422 is a reply to message #311409] |
Sat, 10 December 2016 13:09 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
Karma: 13
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Thanks Larry! That is very nice of you. I am in Tucson, AZ. I'll PM you with my contact info.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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