So… I’ve encountered something strange while replacing the rear motor mounts on a 1946 ¾ ton truck with the original ADCA prefix 216 engine in it. EVERY parts source lists the same part for this application eg. CV-227 at The Filling Station, which is supposed to fit everything from 1937 to 1953 except 1947 and up ½ tons. It does NOT fit. This mount is 3 inches wide and that’s too wide to fit between the bell housing and the side of the drop down in the “saddle” of the frame cross member. The old mounts look to be original and the rubbers were in such bad shape the engine was actually sitting solid on the frame. But I measure them to be only 2 inches wide. Luckily I had a set of NOS Chev heavy duty (non rubberized) motor mounts on hand and put them on instead. Two parts sources listed a different mount for 1947 to 1953 ½ tons ONLY, eg. CV-226 at The Filling Station. One of them described it as 2 inches wide. So I took a chance and ordered a set. When they got here they look to be the right ones! Anyone else run into this?
Also… I have a 1942-46 truck parts book, and 29-48 and 29-54 master parts books, and they aren’t even close to agreeing with each other. The 1946 book says the ½ ton and ¾ ton used the same mount, which was different from all the rest of the truck sizes. By 1954 that part number is gone and the trucks that use the same mounts are grouped completely differently… more in line with the way parts suppliers group them now. The more modern parts books appear to be wrong. At least about ¾ tons. And no, my frame cross member hasn’t been replaced. Looks like factory rivets to me. Again, anyone else run into this? Ole
It's also possible that the parts books were right, and more recent part number substitutions have resulted in parts that only work for some of the applications covered by parts that were already substitutes by 1954. I've certainly run into this with JD. They occasionally sub a part up to one from a newer piece of equipment, and it just plain don't fit!
I took a couple of pictures to show what I'm talking about. The left mount is the CV-226 that looks like it will work. The right mount will NOT work. I tried. I even tried cutting an inch off of one. That's when I found out how poorly they are filled with rubber between the 2 steel parts. The cruddy thing in the middle is of course the one I took off. :-) Ole
So... My truck parts book is actually a 1938-46. That said, it shows part #595741 for 1938-46 1/2 and 3/4 tons. Part #598097 for larger trucks. In the back of the 1929-54 book it says to substitute #3702198 for #595741. Part #598097 just disappears. But in the front of the book part #3702198 is listed as for ALL 1937- 53 "commercial" trucks EXCEPT 1947 (2nd design) to 1953 1/2 tons... even though the earlier book listed 2 different mounts to cover the same span of trucks. And a note says that #3702198 uses the same identification number as the part for ALL 1938 to 53 "utility" vehicles (#3702173) "implying" they are the same. But are they?
Confused yet? I sure am!
Parts suppliers are supplying 1 engine mount that's supposed to replace #370298 AND #3702173. But it sure won't take the place of the #595741 on my 1946 3/4 ton. So what does it cover? I'm beginning to think maybe the other engine mount (CV-226 at The Filling Station) may actually be the better choice to cover ALL 1937 to 53 trucks.
My rule fo thumb is use the little mounts on big trucks and big mounts on little trucks. I keep both types on my shelf and have led a frustration-free life for decades.
I've been plowing snow with a 1949 one ton since 1980. The low speed high torque application puts the left mount in tension and tore the rubber out almost annually. The shift stick does a dance when the mount lets go. So I changed that mount to the heavy duty type without rubber and plowed happily ever after.
Bob VCCA 6951 Tech advisor 18-- Advance Design trucks
Bob Interesting post! I actually found an NOS Chevrolet set of the heavy duty mounts you mention, and I put them in before I got my hands on a set of the little mounts. Both sides. I was thinking it might be beneficial to swap in the little rubber mounts in the near future. But after reading your post... I feel much better about the heavy duty mounts, and I'm leaving them right where they are... in the truck. Thanks for that!
