Recent Topics
Tanker 912 (DC-10) downhill fire retardant drop!
by Drew99GT
09/20/14 02:39 PM
Oreilly $10 off $10 coupon email.
by laserred96gt
09/20/14 02:30 PM
Diff noise
by supton
09/20/14 02:19 PM
do you ever...
by joegreen
09/20/14 02:06 PM
Car fax
by ARB1977
09/20/14 02:00 PM
2008 Trailblazer Tires
by jims5600
09/20/14 01:56 PM
AutoZone Oil Clearance
by Spartanfool
09/20/14 01:45 PM
1986 Pulser (Canadian Tire brand) 14" Color TV
by Robb.
09/20/14 01:05 PM
XENUM VX500 ADVANCED OIL ADDITIVE
by biewabbeljoe
09/20/14 12:15 PM
Question about OCD
by Darwin1138
09/20/14 12:07 PM
Fantastic instructional video about welding
by L_Sludger
09/20/14 12:07 PM
New Joe Bonomassa song and album
by Jimmy9190
09/20/14 11:49 AM
Newest Members
Talkinghorse1, kerrangsta, mavric240, LABanker, gpguy
51350 Registered Users
Who's Online
77 registered (Bill_G, biewabbeljoe, asand1, 04SE, 2009Edge, Bookmaker, 5 invisible), 1740 Guests and 231 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51350 Members
64 Forums
219531 Topics
3464928 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 1 of 2 1 2 >
Topic Options
#1200403 - 07/23/08 08:56 PM JB Weld on Exhaust Manifod - bad idea?
Horatio Offline


Registered: 10/15/03
Posts: 214
Loc: Calgary, Alberta
Hi all, it turns out I may have a cracked exhaust manifold on my '99 Civic. From searching around on d-series.org it sounds like this is a fairly common occurrence and in fact a lot of drivers simply ignore it for some period of time. It seems like there's a decent seal of the air intake for te interior fan from the engine bay but I really don't like the thought of having a potential leak up there. Other than the proper fix of replacing any parts that may be broken, is it possible to use JB Weld or something similar to make a temporary patch? I had a mechanic tell me to not use that "stuff" because it can catch fire.

thanks for thoughts/opinions!

Greg

Top
#1200412 - 07/23/08 09:03 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: Horatio]
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
As is all too common, your mechanic is wrong, JB weld won't catch fire if you throw it in a volcano. Unfortunately it won't fix your exhaust manifold either, it's rated for a max of 600 degrees and it will pop right off.

They do; however, make other products specifically designed for sealing exahust. Check the "goop" isle of your local auto parts store.
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top
#1200466 - 07/23/08 09:55 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: SecondMonkey]
JohnBrowning Offline


Registered: 05/01/03
Posts: 9448
Loc: USA
If you get the cracked area glowing white hot you can weld it. I have down it with Oxy/Act and with a arc welder but you have to get the casting glowing white and keep it like that until the weld is complete so haveing two goes makes it work a lot easier if you do not have a furnace to heat the casting in.

Top
#1200467 - 07/23/08 09:55 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: SecondMonkey]
alreadygone Offline


Registered: 01/04/06
Posts: 3161
Loc: North Arkansas
Unfortunately, their all a waste of time and money also. Manifold is subjected to such extreme heat flunctuation that no other material will expand and contract at same rate (IT pulls it's self apart in the first place instead of "breaking") that any "goop" will fall off in short order,I. E. days! Try salvage used part.

Bob
_________________________
To which version of reality would you like to convert me?

Bob

Top
#1200482 - 07/23/08 10:07 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: JohnBrowning]
XS650 Offline



Registered: 12/21/03
Posts: 12385
Loc: Northern CA
I have successfully welded cast iron exhaust manifolds by arc welding them with nickle alloy electrodes in a plain old AC arc welder. I didn't do anymore preheat than heating the area with a propane torch.

Look for arc welder electrodes for welding cast iron.
_________________________
Whenever you find yourself on the side of the majority, it is time to pause and reflect.

--Mark Twain

Top
#1200499 - 07/23/08 10:27 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: alreadygone]
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
 Originally Posted By: alreadygone
Manifold is subjected to such extreme heat flunctuation that no other material will expand and contract at same rate


While I haven't actually tried any of these products, I believe there are some that remain flexible, sort of like heavy duty RTV.
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top
#1200726 - 07/24/08 08:13 AM Re: JB Weld on Exhaust Manifod - bad idea? [Re: SecondMonkey]
johnd Offline


Registered: 03/02/05
Posts: 621
Loc: Austin, TX
 Quote:
I have successfully welded cast iron exhaust manifolds by arc welding them with nickle alloy electrodes in a plain old AC arc welder. I didn't do anymore preheat than heating the area with a propane torch.

Look for arc welder electrodes for welding cast iron.

Works just fine. The only downside is that the nickel rod is expensive.

Top
#1200745 - 07/24/08 08:40 AM Re: JB Weld on Exhaust Manifod - bad idea? [Re: johnd]
Horatio Offline


Registered: 10/15/03
Posts: 214
Loc: Calgary, Alberta
thanks for the good replies all.

Wish I had a welding setup though it should be pretty cheap to take it to a welding shop.

I might give the Goop-type stuff a go just out of simplicity and laziness. If it works, I'm out a bit of time a a few $$ and if not, it was busted anyway. Also would be interesting to see if there really is something that can hold up to the temperature swings especially once winter is here.


BTW the way I found that there may be a leak was that when giving the car a Seafoam treatment this week, there was a lot of smoke from the front of the engine that kept coming after the engine was off. Also, obvious splatter of SOMEthing on the block that wasn't there before. Kind of funny but kind of freaky too.


Thanks again,

Greg

Top
#1200746 - 07/24/08 08:41 AM Re: JB Weld on Exhaust Manifod - bad idea? [Re: johnd]
XS650 Offline



Registered: 12/21/03
Posts: 12385
Loc: Northern CA
 Originally Posted By: johnd
 Quote:
I have successfully welded cast iron exhaust manifolds by arc welding them with nickle alloy electrodes in a plain old AC arc welder. I didn't do anymore preheat than heating the area with a propane torch.

Look for arc welder electrodes for welding cast iron.

Works just fine. The only downside is that the nickel rod is expensive.


wow, about $30/lb at McMasterCarr.
_________________________
Whenever you find yourself on the side of the majority, it is time to pause and reflect.

--Mark Twain

Top
#1200942 - 07/24/08 12:59 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: XS650]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
1 New or used manifold
2 A smart and careful welder
3 There are exhaust high temp sealers that may work, at least for a while - look in the muffler repair section at the auto parts store. Cleanliness and proper dry time is essential. Wrapping or capping the repair is best.

Top
#1201100 - 07/24/08 05:13 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: mechtech2]
JohnBrowning Offline


Registered: 05/01/03
Posts: 9448
Loc: USA
The only problem with used is that you really have to check the part out to make sure it is not also cracked.The Geo Metro 3 cylinder has the same issue and I had a heck of a time finding one that was either not cracked or had a short enough crack that I could actualy weld it and expect it to hold.They would crack at the collector so it was a structural thing as well.

Top
#1201230 - 07/24/08 09:11 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: Horatio]
alreadygone Offline


Registered: 01/04/06
Posts: 3161
Loc: North Arkansas
 Originally Posted By: Horatio
thanks for the good replies all.

Wish I had a welding setup though it should be pretty cheap to take it to a welding shop.

I might give the Goop-type stuff a go just out of simplicity and laziness. If it works, I'm out a bit of time a a few $$ and if not, it was busted anyway. Also would be interesting to see if there really is something that can hold up to the temperature swings especially once winter is here.


BTW the way I found that there may be a leak was that when giving the car a Seafoam treatment this week, there was a lot of smoke from the front of the engine that kept coming after the engine was off. Also, obvious splatter of SOMEthing on the block that wasn't there before. Kind of funny but kind of freaky too.


Thanks again,

Greg


If you want to goop it or glop it go for it. If you want to have it welded, that's worth a shot also,,just don't take it in for welding AFTER goop/glop!!! Any welder worth his pay will tell you where to stick it with that [censored] in the pores of the metal.

Yes, I've welded manifolds also. Some with nickel, some with plain old wire welder. Just can't get success ratio high enough to justify charging customers for my time (ain't doing it for my health or entertainment) If you're a reasonably good amateur it's a lot of fun and ocassionally rewarding challenge. If not, put the money toward replacement part.

Bob
_________________________
To which version of reality would you like to convert me?

Bob

Top
#1201243 - 07/24/08 09:30 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: alreadygone]
LT4 Vette Offline


Registered: 09/12/04
Posts: 12310
Loc: USA
This also happened to our 1998 Civic and I just decided to buy an aftermarket exhaust manifold for $75

Ours had a 3 inch hair line crack. If you do get your manifold welded, be prepared to have it rewelded in th e future.

Top
#1201314 - 07/24/08 11:25 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: LT4 Vette]
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
For what it's worth, my Jeep has had a cracked exhaust manifold for at least 4 years now. I have no plans to fix it. It just makes the engine sound better...
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top
#1201540 - 07/25/08 12:33 PM Re: JB Weld on Exhaust Manifod - bad idea? [Re: SecondMonkey]
Mr_Incredible Offline


Registered: 01/02/07
Posts: 1372
Loc: Nebraska
You can weld cast iron by stick or oxy. Use nickel allow. Must preheat for best results.

Exhaust gas is corrosive and under high pressure . Would likely blow out any kind of goo.

JBWeld would simply melt at high temps. I tried to fix a broken hinge on an aluminum gas grill top. It got to temp and the hood fell off after the JBW melted.


$.02
_________________________
"Daaaaaayng." -Joe Dirt

'12 Prius C
'09 Prius
'99 F-250 Super Duty V10
'98 Z28 LS1
'82 KZ1100
'79 Suzuki GS550L


Top
Page 1 of 2 1 2 >