| [GMCnet] Removing left exhaust manifold. [message #209486] |
Fri, 31 May 2013 22:55  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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10 years ago I had a burned valve on the right side. Since I have the valve grinding equipment. I pulled the head an fixed the problem myself. BUT, I broke two exhaust manifold bolts. The head was off, so no real problem.Now I have a broken left manifold. Any great ideas on how to get all the bolts out with out breaking any of them? Bob Dunahugh 78 Royale Just love these GMC's
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| Re: [GMCnet] Removing left exhaust manifold. [message #209497 is a reply to message #209486] |
Sat, 01 June 2013 01:02  |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Ive been pretty lucky with this process: First I will run the engine to operating temperature for 5 minutes and try to crack the exhaust manifold bolts while running hot and then try to remove bolts while the engine is still hot. (Of course this won't work on a dead horse (Engine not running)) Any that don't crack I will use torch heat. (Dead horse need them all heated) I use torch heat on these unruly exhaust bolts before trying to remove them. Make the bolt heads red hot for enough time to get the heat into the threads Allow to cool only enough to give the bolt some strength back. (works especially well on the bolts where the pipes connect to manifold because you can also get the bolt ears red hot) I've broken less bolts this way but it is not perfect. Bolts that have rusted so bad that they have "necked" are a different story however.
Those of you who are steam engineers know that boilers need to be inspected regularly and need to have plugs removed for the inspector. You will know that you need to crack those Boiler plugs while it is hot or you will never get them out. The same theory for the exhaust manifold bolts.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: [GMCnet] Removing left exhaust manifold. [message #209631 is a reply to message #209486] |
Sun, 02 June 2013 16:20 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Hi Bob, the 403 and 455 use the same left manifold, only the right is different. The small block 403 right side has a sharper bend to clear the oil cooler adapter.
| BobDunahugh wrote on Fri, 31 May 2013 23:55 |
10 years ago I had a burned valve on the right side. Since I have the valve grinding equipment. I pulled the head an fixed the problem myself. BUT, I broke two exhaust manifold bolts. The head was off, so no real problem.Now I have a broken left manifold. Any great ideas on how to get all the bolts out with out breaking any of them? Bob Dunahugh 78 Royale Just love these GMC's
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C. Boyd
76 Crestmont
East Tennessee
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