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TSB 91-21-08 (Excerpt)

For this full & other TSBs, check here.

Replacing the RIGHT side radius arm bracket fasteners on vehicles built prior to February 1990.
(This does not apply to F-350 4X4 or F-250 4X4 because no radius arms are used).

NOTE: THE SPECIFIED FASTENERS AND TORQUE REQUIREMENTS MUST BE USED. SEE THE DIAGRAM FOR A DESCRIPTION OF PARTS CONTAINED IN THE RIGHT SIDE RADIUS ARM BRACKET KIT (E8TZ-3L095-A). REPLACE ONE RIVET AT A TIME TO MAINTAIN BRACKET LOCATION.

a. Start with rivet number one (1). Drill an 1/8" hole through the middle of the rivet

b. Drill the same hole with an 11/32" drill.

c. Use an air chisel to remove the rivet head.

d. Drive the rivet out with a punch.

e. Line ream the rivet hole in the frame web to a 1/2" diameter.

f. Install a 1/2" Grade 8 bolt. The bolt head must be on the inboard side of the frame. Install a 1/2" hardened washer on the outside of the bracket. Install the nut and tighten to 105 lb.ft. (142 N-m).

g. Remove the number two (2) rivet using Steps a through d.

h. Line ream the number two (2) rivet hole on the frame flange to a 9/16" diameter.

i. Install a 9/16" Grade 8 bolt. The bolt head must be on the inboard side of the frame flange. Install a 9/16" hardened washer on the outboard side of the bracket. Install the nut and tighten to 140 lb.ft. (190 N-m).

j. Repeat steps h and i for the number three (3) rivet.

NOTE: MAKE SURE THE TORQUE SPECIFICATIONS ARE FOLLOWED.

CAUTION: THE FOLLOWING STEPS APPLY ONLY TO BRONCO VEHICLES BUILT AFTER FEBRUARY 1990. THE ATTACHMENT HARDWARE (NUTS AND BOLTS) USED IN THE SERVICE REPAIR AND PRODUCTION ARE DIFFERENT AND THE TORQUE SPECIFICATIONS ARE DIFFERENT. DO NOT APPLY THESE STEPS ON BRONCOS BUILT BEFORE FEBRUARY 1990.

k. Check the torque on the nuts securing the right hand radius arm pivot bracket.

l. Check and adjust, if required, the torque of the nuts securing the right hand radius arm pivot bracket to the frame flange. The correct torque is 75 lb.ft. (100N-m).

m. Check and adjust, if necessary, the torque of the nuts securing the right hand radius arm pivot bracket to the frame web (side rail). The correct torque is 110 lb.ft. (150N-m).

See also:
. . . . .