Great White Posted June 18 Share Posted June 18 Greetings all: The battle rages on with the wild harvested 1926 AC. The exhaust manifold looks to be retained by two large clamps. We would expect that if we remove the bolts in the center of the clamps that retain the intake and exhaust manifold it should come off. It acts like there is another bolt bolding it on. The 1924 parts book does not show any other clamps or exhaust manifold mounting bolts. It moves a small distance when pried from the front. Could there be fire rings in the ports holding it to the jugs? Any wisdom would be greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/ Share on other sites More sharing options...
h67st Posted June 19 Share Posted June 19 I don't know if anybody on this site has experience with those ancient dogs. Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-577792 Share on other sites More sharing options...
mrsmackpaul Posted June 19 Share Posted June 19 I think it would have to have at the very least 3 clamps and most likely 4 clamps to get everything sealed on the intake properly A bit hard to tell with a actual photo Paul Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-577805 Share on other sites More sharing options...
mechohaulic Posted June 19 Share Posted June 19 4 hours ago, h67st said: I don't know if anybody on this site has experience with those ancient dogs. and if WE did. we couldn't remember anyway !!LOL 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-577812 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted June 20 Popular Post Share Posted June 20 10 hours ago, mechohaulic said: and if WE did. we couldn't remember anyway !!LOL Yeah your probably right But I reckon we can bull shit with the best of them ha ha ha ha Paul 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-577833 Share on other sites More sharing options...
Popular Post h67st Posted June 24 Popular Post Share Posted June 24 On 6/20/2025 at 5:30 AM, mrsmackpaul said: Yeah your probably right But I reckon we can bull shit with the best of them ha ha ha ha Paul Actually Paul I don't think I could BS as well as you! 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-578007 Share on other sites More sharing options...
Great White Posted 11 hours ago Author Share Posted 11 hours ago After a few beers and some serious head scratching we found the solution. There is a short stud under the manifold between #4 exhaust and inlet ports that retains the clamp which holds the #4 exhaust manifold against the block . It is completely obscured . It had a brass nut that somehow got thicker across the flats. One could start a 7/8" 4 way angle head wrench but it would not fully engage the nut and get enough of a purchase to turn it. In despair we were able to get a 15/16 wrench on it and back it off of the stud a few degrees at a time with some help from the acetylene torch. It was a bugger. The stud must have grown some rust that pushed the nut outward in the center of the flats. The nut was 7/8" across the flats originally. Mack described a special wrench (manifold fork stud wrench)Special Wrench.pdf specifically for servicing that nut. There was such a wrench still in the running board tool box . Maybe this will spare the next mechanic who dares to remove the manifolds some anguish. Quote Link to comment https://www.bigmacktrucks.com/topic/75686-wild-harvested-mack-ac-exhausting-problem/#findComment-578397 Share on other sites More sharing options...
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