 SS exchangers |
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| StratPlayer |
 Jul 6 2017, 07:11 AM
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#1
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StratPlayer  Group: Members Posts: 3,324 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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Great write up PMB has done on SS exchangers. My car is in for some work and they discovered this problem with my exchangers.
Folks with SS exchangers should give a look. https://www.facebook.com/PMBPerformance/pho...9673193/?type=3 |
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| GeorgeRud |
Jul 6 2017, 07:47 AM
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#2
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Important information! Please be sure to have a CO detector in the car.
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| Mark Henry |
Jul 6 2017, 07:57 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(GeorgeRud @ Jul 6 2017, 09:47 AM)  Important information! Please be sure to have a CO detector in the car. Yep I have seen this issue, the ears are the weakest link on SSI's. If damaged they should be TIG welded and the ends always need to be squared up. Don't be a gorilla with a ratchet, get a torque wrench, if it doesn't seal up correct the problem don't just keep cranking. If you want the piece of mind of a CO2 detector Aircraft Spruce sells nifty little stick on buttons that you can put on your speedo, etc. They only last for about 18 months, but are dirt cheap. |
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| 02loftsmoor |
Jul 6 2017, 07:59 AM
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#4
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Senior Member Group: Members Posts: 577 Joined: 26-June 11 From: Ft. Worth TX Member No.: 13,243 Region Association: Southwest Region
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I haven't been on in a while,, what's going on??
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| Shadowfax |
Jul 6 2017, 08:48 AM
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#5
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Show us the meaning of haste Group: Members Posts: 509 Joined: 19-January 15 Member No.: 18,340 Region Association: South East States
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Yep. Mine looked almost that bad. There were some hard-to-see cracks around the ears too. All fixed now but was an expensive lesson. (IMG:style_emoticons/default/welder.gif)
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| 914_teener |
Jul 6 2017, 09:39 AM
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#6
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914 Guru Group: Members Posts: 5,262 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
This is a typical result of crevice cracking from the weld originally and poor fabrication and post passivation of CRES.
Don.t need a macrograph to tell. |
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| 914_teener |
Jul 6 2017, 09:40 AM
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#7
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914 Guru Group: Members Posts: 5,262 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Mine did the exact same thing.
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| Spoke |
Jul 6 2017, 10:12 AM
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#8
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Jerry Group: Members Posts: 7,154 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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Mine cracked as well.
Attached image(s) 
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| 914_teener |
Jul 6 2017, 10:45 AM
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#9
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914 Guru Group: Members Posts: 5,262 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Here is how to fix it. These should be TIG welded only with Argon and a large diffused gas cup.
Mark the location of the ear BEFORE removing anything. I welded mine with a make do fixture sorry no pictures. .I did it right before I got married. Clean the pipe and parts THOUROUGHLY until the passive layer of the stainless is bright inside the exhaust and out. Plug the exhaust pipe at one end and make a purge chamber from a tee on your flowmeter. This will fill the pipe with Argon so the back side of the weld will be free from oxidation or inclusions. Reweld the ear on the fixture ....I used an old head. Tack it all up post purging your tack welds with the TIG torch. Weld it ALL around to avoid any crevices. You will have to re true the mating surfaces as just this little welds will want to move the stress drawn tubing as the welding will do this so avoid avoid overheating the weld. Sorry.... no pics but this is what I did and no problems since. I saw this particular weld as bad manufacturing design. |
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| rhodyguy |
Jul 6 2017, 11:22 AM
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#10
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,238 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Over torquing to cure a leaky he does a nice job of tearing the hoops away. Over trueing the pipe tops doesn't help. Mark with a black sharpie and use a light touch with a large file.
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| North Coast Jim |
Jul 6 2017, 01:24 PM
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#11
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Member Group: Members Posts: 339 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region
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Both of mind cracked the same way. One was welded and I couldn't get it sealed again. Probably due to stress on one side of the pipe due to the welding operation and it's ever so slightly bent out of position. Won't try it again.
So I've bought two more. Wish me luck...................and I am using the 18ft Lb torque with a quality ratchet and ensuring there are no burrs on the fastening surface. |
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