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| Re: Exhaust Manifold Rupture [message #304406 is a reply to message #304397] |
Thu, 28 July 2016 08:02   |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Ouch! I agree with Ken, not a crack. Did not mention 455/403, but crack is not repairable. 455 Passenger side exhaust manifold is hard to come by. Might be time for headers. No idea what caused the blow out, but it is impressive.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Exhaust Manifold Rupture [message #304417 is a reply to message #304395] |
Thu, 28 July 2016 10:36 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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I would consider headers (thorley)and free flow mufflers (walker dynamax) or equivalent.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Exhaust Manifold Rupture [message #304444 is a reply to message #304395] |
Thu, 28 July 2016 13:31 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Cause is age, heat and metal fatigue/rust.
Sometimes a small crack is repairable in place by drilling the ends, groving the crack heating and arc welding with a nickel rod. Or furnace brazing and remachining.
This one is beyond FUBAR.
76 Glenbrook
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| Re: Exhaust Manifold Rupture [message #304489 is a reply to message #304434] |
Fri, 29 July 2016 07:01 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Clark,
I have seen such failures. What I can also tell you is that it is nothing remarkable, it was just a cast material failure that was run for a period at high load. The metal near the leak was both over heated and some carried away by the exhaust stream. It was most likely caused be an inclusion in the casting.
The use of hardened fasteners in exhaust systems in not advised. If you do, they should only be tensioned to level of a grade two fastener. All high grade parts get the increased strength from heat treatment. While this does require better alloys, after a short period at exhaust temperatures, the effects of heat treatment are just about gone. I also advise that if you did not coat the fasteners liberally with a good anti-sieze that you remove them and do so now. One of the side effects of the heat treatment and alloy is a propensity for galling.
Matt
Clark76 wrote on Thu, 28 July 2016 13:29I have already replaced it with another manifold from a local parts-coach. Also used new copper gasket, gasket seal, and new #8 hardened bolts and lock-washers. Took it on a long trip and no further issues. Clearly, the metal fatigued in the old Exhaust Manifold. I am just curious if anyone has seen a rupture like this before and if so, If they knew the cause, so it won't happen again.
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Exhaust Manifold Rupture [message #304519 is a reply to message #304418] |
Fri, 29 July 2016 11:13 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Jon, PM sent.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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