stupid leaky collector gaskets - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 09-27-2005, 02:52 PM

Anyone have any good ways to seal up collector gaskets? The flanges are a little bent, and I think that's most of my problem. Anyways I've used the cheapo papers ones, copper, and aluminum, and they still leak!

Thanks

Bill72BB · 09-27-2005, 03:09 PM

Have you tried Percy's Dead soft gaskets ?
http://www.percyshp.com/products.html

red71cheyenne · 09-27-2005, 03:30 PM

Must be a NW thing! My drivers side started leaking Saturday!

I've tried the dead soft and they were no better than the paper ones. I need a solution too! Jeff.

cduster · 09-27-2005, 03:36 PM

Cut the flanges off and use a band clamp. Has worked for me in the past.

Dan

chevyfarmer · 09-27-2005, 03:39 PM

I have had my fair share of exhaust leaks. Might want to try a double gasket, that has worked for me in the past. If your flanges are bent it will be really difficult to have any gasket hold up. Good Luck

gator2511 · 09-27-2005, 03:41 PM

I have always used Percys Aluminum gaskets. To get a good seal you have to take a file to the mating surfaces and then wire brush them good. I never had one fail after that.

Putter · 09-27-2005, 03:41 PM

Two words....
MIG WELDER (j/k)

Chris H · 09-27-2005, 03:43 PM

No more leaks!

LUV2XCLR8 · 09-27-2005, 04:26 PM

Go Buy New New Headers

Ackattack · 09-27-2005, 05:12 PM

I just got my headers re-coated from jethot. The flange on them is fine. Its the flange on teh other side. Maybe I ought to just take it to a muffler shop and have a new collector installed.

matthufham · 09-27-2005, 05:13 PM

Quote:

Originally Posted by Chris H

No more leaks!

that's the american way!

FirstGen · 09-27-2005, 05:14 PM

It's all in the mating surfaces guys. If they are bent up, nothing is going to keep them sealed. Also if they are not perfectly angled (one slightly off) they will not seal. The best thing to do is to go to a decent muffler shop and have them cut off your current flanges, and weld on some new ones. Make sure they bolt together the two with the gasket in and then tack weld the collector exactly where it should be. Now remove your gasket if it is paper and weld all the way around.

I guarentee you won't have another leak...

I haven't had a single leak since I built my exhaust even with all the nitrous backfires and such...

09-27-2005, 02:52 PM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	stupid leaky collector gaskets Anyone have any good ways to seal up collector gaskets? The flanges are a little bent, and I think that's most of my problem. Anyways I've used the cheapo papers ones, copper, and aluminum, and they still leak! Thanks __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

09-27-2005, 03:09 PM	#2
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	Have you tried Percy's Dead soft gaskets ? http://www.percyshp.com/products.html __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , Last edited by Bill72BB; 09-27-2005 at 03:10 PM.

09-27-2005, 03:30 PM	#3
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Must be a NW thing! My drivers side started leaking Saturday! I've tried the dead soft and they were no better than the paper ones. I need a solution too! Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

09-27-2005, 03:36 PM	#4
cduster Registered User Join Date: Oct 2002 Location: S.W. Michigan Posts: 403	Cut the flanges off and use a band clamp. Has worked for me in the past. Dan __________________ Good Judgment comes from experience. Most experience comes from bad judgment.

09-27-2005, 03:39 PM	#5
chevyfarmer Registered User Join Date: Feb 2005 Location: Owosso, Mi Posts: 242	I have had my fair share of exhaust leaks. Might want to try a double gasket, that has worked for me in the past. If your flanges are bent it will be really difficult to have any gasket hold up. Good Luck __________________ 67 short wide 355ci 3 on tree 69 short wide 250ci 3 on tree 68 long wide 283 3 on tree 72 2wd Blazer project 454 5 speed

09-27-2005, 03:41 PM	#6
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	I have always used Percys Aluminum gaskets. To get a good seal you have to take a file to the mating surfaces and then wire brush them good. I never had one fail after that.

09-27-2005, 03:41 PM	#7
Putter More Cowbell.... Join Date: Mar 2004 Location: Puckett, MS Posts: 3,569	Two words.... MIG WELDER (j/k) __________________ *There once was a member from Puckett.....Who ( fill in the blank blank blank* ) bucket**

09-27-2005, 03:43 PM	#8
Chris H 72 C30 Trailer Queen Join Date: Dec 1999 Location: SE MN, USA Posts: 794	No more leaks! __________________ Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts

09-27-2005, 04:26 PM	#9
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Go Buy New New Headers __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

09-27-2005, 05:12 PM	#10
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	I just got my headers re-coated from jethot. The flange on them is fine. Its the flange on teh other side. Maybe I ought to just take it to a muffler shop and have a new collector installed. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

09-27-2005, 05:14 PM	#12
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	It's all in the mating surfaces guys. If they are bent up, nothing is going to keep them sealed. Also if they are not perfectly angled (one slightly off) they will not seal. The best thing to do is to go to a decent muffler shop and have them cut off your current flanges, and weld on some new ones. Make sure they bolt together the two with the gasket in and then tack weld the collector exactly where it should be. Now remove your gasket if it is paper and weld all the way around. I guarentee you won't have another leak... I haven't had a single leak since I built my exhaust even with all the nitrous backfires and such... __________________ 1968 C10 build in process TT LSA/6L90e/9"



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