nam vet Posted April 2, 2023 Share Posted April 2, 2023 1962 B422 Gas Termodine Engine. Positive ground or negative ground?? Quote Link to comment Share on other sites More sharing options...
mowerman Posted April 2, 2023 Share Posted April 2, 2023 I don’t know, but I would guess I was on the road. I’m sure somebody else will answer your question. Good luck…. Bob Quote Link to comment Share on other sites More sharing options...
tjc transport Posted April 2, 2023 Share Posted April 2, 2023 kind of hard to say. it may have started as positive ground and been converted to negative ground. about the only way to tell for sure is trace the wires. 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
Vladislav Posted April 3, 2023 Share Posted April 3, 2023 ...or send request to Mack Historical Museum for the VIN record. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
mowerman Posted April 3, 2023 Share Posted April 3, 2023 Not sure what happened to my message, but I believe it supposed to be positive ground.. Bob Quote Link to comment Share on other sites More sharing options...
james j neiweem Posted April 3, 2023 Share Posted April 3, 2023 How was the B421 and 422 different from the B42? Quote Link to comment Share on other sites More sharing options...
yarnall Posted April 4, 2023 Share Posted April 4, 2023 The 422 has an overhead valve rather the the flat head in the 42. I haven’t been able to figure out the 421. 2 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted April 4, 2023 Share Posted April 4, 2023 On 4/2/2023 at 12:54 PM, tjc transport said: kind of hard to say. it may have started as positive ground and been converted to negative ground. about the only way to tell for sure is trace the wires. have to agree with wire tracing to be sure. museum might send info of what it was built as : not what someone may have changed it over to through the yrs. you looking to make it an original then museum info important. Quote Link to comment Share on other sites More sharing options...
mowerman Posted April 6, 2023 Share Posted April 6, 2023 I can’t even remember how they were wired I haven’t messed with one in a long time i’m surprised Joey has not been on here are TJ they’re usually pretty good at information. I would try Google if you can’t figure it out…. Bob Quote Link to comment Share on other sites More sharing options...
67RModel Posted April 6, 2023 Share Posted April 6, 2023 On 4/3/2023 at 8:00 PM, yarnall said: The 422 has an overhead valve rather the the flat head in the 42. I haven’t been able to figure out the 421. Would it by chance have to do with a Hall Scott gasoline engine? There is that thread in the fire apparatus section of the gentleman with the twin B21 fire engines from the Seattle area and they both have Hall Scott engines in them. Maybe the 21 is a designation for that engine? 2 Quote Link to comment Share on other sites More sharing options...
terry Posted April 6, 2023 Share Posted April 6, 2023 1 hour ago, 67RModel said: Would it by chance have to do with a Hall Scott gasoline engine? There is that thread in the fire apparatus section of the gentleman with the twin B21 fire engines from the Seattle area and they both have Hall Scott engines in them. Maybe the 21 is a designation for that engine? I once owned a B421 , had that flathead mack gas engine, thy were either a 401 or 402 engine. terry Quote Link to comment Share on other sites More sharing options...
Yoos Brothers Construction Posted April 6, 2023 Share Posted April 6, 2023 I was always told the 421 was the cheapest version. The one my brother and I have had zero options new. Quote Link to comment Share on other sites More sharing options...
mowerman Posted April 6, 2023 Share Posted April 6, 2023 I could’ve helped out, but some asshole went into my property while I was in the hospital back surgery 12 years ago and stole all my battery cables. Tweakers ain’t they wonderful, previous to that I took out the parallel switch and the electric starter and went to air know when I hook up the battery, I don’t even know where to start, it is also positive ground bob Quote Link to comment Share on other sites More sharing options...
mowerman Posted April 6, 2023 Share Posted April 6, 2023 I was just kind of curious why some of them used hall Scott??? Bob Quote Link to comment Share on other sites More sharing options...
Vladislav Posted April 6, 2023 Share Posted April 6, 2023 2 hours ago, mowerman said: I was just kind of curious why some of them used hall Scott??? Bob I guess much larger displacement. The firetruck you mentioned had both rear and front hood extensions. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
mowerman Posted April 6, 2023 Share Posted April 6, 2023 OK I was just curious guys seem to get real excited to hear about hall Scott I thought perhaps it was parts availability especially in the West Coast where lots of Mack’s went with Cummins.. thanks for that.. Bob 1 Quote Link to comment Share on other sites More sharing options...
mowerman Posted April 6, 2023 Share Posted April 6, 2023 Quote Link to comment Share on other sites More sharing options...
yarnall Posted April 7, 2023 Share Posted April 7, 2023 I don’t have spec sheet for the B421 but I saw one and it looked the same as the B42. I’ll have to get one so I can compare them side by side. Yoos’ has been repowered which complicates things. Mike 1 Quote Link to comment Share on other sites More sharing options...
Yoos Brothers Construction Posted April 9, 2023 Share Posted April 9, 2023 (edited) On 4/6/2023 at 8:37 PM, yarnall said: I don’t have spec sheet for the B421 but I saw one and it looked the same as the B42. I’ll have to get one so I can compare them side by side. Yoos’ has been repowered which complicates things. Mike Yes ours came with an EN401 originally before being repowered with the EN414 (ala Chrysler 413 industrial). It still has the original baby quadbox in it though. Denton concrete roads out of Michigan bought ours new. They had a huge fleet of B421s at one point Edited April 9, 2023 by Yoos Brothers Construction 2 Quote Link to comment Share on other sites More sharing options...
MorrisMe Posted April 10, 2023 Share Posted April 10, 2023 Mine were both Positive ground. How did I know? Since they came that way, I checked the diameter of the cable post, and they fit positive post to the grounded cable, negative post diameter fit the starter side cable, so I knew that was how the last battery was installed. Not really sure there is any advantage to switching it over unless a guy was determined and really wanted to go to all the trouble. Maybe I would do it if I was going to install lots of modern electronics. Quote Link to comment Share on other sites More sharing options...
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