The Ford Barn - View Single Post - Difficulties installing & torquing rear drum

psogden · 08-29-2016, 05:41 PM

Before departing on a short trip for a few days (and getting back to the reality of the problem at hand) did some checking to satisfy my curiosity.

Here is part of a Ford Barn post from “Kens 36” dated 4-19-11: “A mailgram dated 10-20-47 (from the Ford Archives) detailed the procedure for assembling the hub and drum to the axle shaft. It specified use of a 24 inch handle and a torque of 300-350 foot-pounds. Service Letter A-25 dated 11-6-47 corrected the torque setting, stating: “tighten nut 356074-S to 200-220 foot pounds; then continue to the next castellation providing final resultant torque does not exceed 275 foot pounds.”

I then consulted (former and deceased) Ford V-8 Times great repair guru Dick Flynn’s article on the subject. Here is his recommendation. “Torque nut to 150-160 ft. lbs. of torque. The axle metal is grade 8 or better, 5/8-inch grade 8 bolt torque is 225 ft. lbs. So we aren’t even close to that."

So, obviously there is considerable discrepancy here. But 220 would appear to be pushing the outer limits if Flynn is correct.

08-29-2016, 05:41 PM	#18
psogden Member Join Date: Apr 2013 Location: Auburn, CA Posts: 86	Re: Difficulties installing & torquing rear drum - Help! Before departing on a short trip for a few days (and getting back to the reality of the problem at hand) did some checking to satisfy my curiosity. Here is part of a Ford Barn post from “Kens 36” dated 4-19-11: “A mailgram dated 10-20-47 (from the Ford Archives) detailed the procedure for assembling the hub and drum to the axle shaft. It specified use of a 24 inch handle and a torque of 300-350 foot-pounds. Service Letter A-25 dated 11-6-47 corrected the torque setting, stating: “tighten nut 356074-S to 200-220 foot pounds; then continue to the next castellation providing final resultant torque does not exceed 275 foot pounds.” I then consulted (former and deceased) Ford V-8 Times great repair guru Dick Flynn’s article on the subject. Here is his recommendation. “Torque nut to 150-160 ft. lbs. of torque. The axle metal is grade 8 or better, 5/8-inch grade 8 bolt torque is 225 ft. lbs. So we aren’t even close to that." So, obviously there is considerable discrepancy here. But 220 would appear to be pushing the outer limits if Flynn is correct.