Need tips and torque specification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nima · 05-17-2005, 01:07 AM

Heys guys:
as some of you know I am in the process of changing my exhaust pipes and mufflers. since this is the first time I am doing it i would appreciate any tips regarding instalation to prevent any exhaust leaks. By the way, how do you check for exhaust leak? also what is the required torque for bolts at ram horns to the pipe connection? When I was removing the old pipe I noticed that there was two sets of nuts on each bolt (at the ram horn location), also some of them had more than couple of washers on them! any idea why?
Thanks.

longhorn71 · 05-17-2005, 01:33 AM

the best way to find a leak is to look for black carbon on the outside of the connections.If it is leakin at the manifold to head connection it should discolor the paint around the conncection

Nima · 05-17-2005, 06:22 PM

Thanks for the reply. Do you know how tight the flange should be? Do I have to tighten them again after few days?

Nima · 05-18-2005, 10:51 AM

Humm!!

jhow66 · 05-18-2005, 11:06 AM

About three grunts. Retighten after a few heating and cooling periods.

jtminton · 05-18-2005, 12:04 PM

Two nuts? Maybe somebody got tired of retightening them and put them on as lock nuts. I just had to replace the metal ring gasket on one of my pipes where it meets the manifold. I just tightened them back about as tight as I could.

Nima · 05-18-2005, 02:38 PM

Thanks guys. I just wanted to be sure since the flange is very old looking I didn't want to break anything due to excessive pressure.

05-17-2005, 01:07 AM	#1
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Need tips and torque specification Heys guys: as some of you know I am in the process of changing my exhaust pipes and mufflers. since this is the first time I am doing it i would appreciate any tips regarding instalation to prevent any exhaust leaks. By the way, how do you check for exhaust leak? also what is the required torque for bolts at ram horns to the pipe connection? When I was removing the old pipe I noticed that there was two sets of nuts on each bolt (at the ram horn location), also some of them had more than couple of washers on them! any idea why? Thanks.

05-18-2005, 11:06 AM	#5
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	About three grunts. Retighten after a few heating and cooling periods. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

05-18-2005, 12:04 PM	#6
jtminton II Timothy 4:2 Join Date: Mar 2005 Location: Fort Worth Posts: 361	Two nuts? Maybe somebody got tired of retightening them and put them on as lock nuts. I just had to replace the metal ring gasket on one of my pipes where it meets the manifold. I just tightened them back about as tight as I could. __________________ 72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk."

05-17-2005, 01:33 AM	#2
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	the best way to find a leak is to look for black carbon on the outside of the connections.If it is leakin at the manifold to head connection it should discolor the paint around the conncection

05-17-2005, 06:22 PM	#3
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Thanks for the reply. Do you know how tight the flange should be? Do I have to tighten them again after few days?

05-18-2005, 10:51 AM	#4
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Humm!!

05-18-2005, 02:38 PM	#7
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Thanks guys. I just wanted to be sure since the flange is very old looking I didn't want to break anything due to excessive pressure.



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