I think these are most often damaged by hanging the unsupported pipe off them, unsupported as mentioned earlier, and then happily working on exhaust system front to back. ..then pipe acts as a big torque wrench putting high forces on bolts and flanges. 3” apart bolts say, 4 foot long pipe is 16 to one, pull it with 100lbs into place putting on hanger, puts 1600 lbs on flange bolt . Cast iron really weak in tension..If you think about net loading at flange once pipe and muffler hung properly (hanger behind mufflers) there is not much prying going on at flange at all.
Probably they had trouble at factory with a few animal workers breaking them? I imagine exhaust is hooked up with impact wrench after the ram engine and manifold are dropped in car ..a recipe for breaking them, if pipes not straight. . I only venture into this minefield , as care in installing the pipes is probably more significant than the pan brackets ; and if Rear hanger rubber fails or , muffler fell down (rust) a broken manifold flange is not far away. So concern about the rear hangers being AAA++ is probably very valid…
AKA, Diesel 300D Mercedes syndrome ; other way round..one hanger way in back, front held by manifold, clip to driveline …to let it shake, as it does. = front of muffler rots out first (by design?) and front falls down, front of muffler catches on road roughness, wraps pipe to rear around back axle while inducing a mini pole vault. “The best pole vault or nothing” .
I’ll take nothing. I drilled hole in floor made loop of coat hanger wire on pipe behind muffler . Also helps let the water out of floor pans .
Thanks for your post. I stand corrected. Good point about the brackets that support the exhaust manifolds on the J’s & K’s. Properly installed, they take some of the stress from the connections to the block. In the 1964 Parts catalog: Page 9-25 (Picture) and 9-45 (Description) for Items 9-48-77 and 9-48-86—Brackets and spacers. If spacers are lost, flat washers should work just fine.
Regarding the J-K header supports.
Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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