Technical Instructions
ATTACHMENT III-1OWNER NOTIFICATION PROGRAM B93
FLOOR PAN REINFORCEMENT 1989/90
BRONCO AND F-SERIES SUPERCAB WITH CAPTAIN CHAIR OPTION
TECHNICAL INSTRUCTIONS
This floor pan reinforcement program will strengthen the area and prevent future cracking.
A. Inspect floor pan for cracks near seat track attachments.
1. Remove both front seats. (See Shop Manual Section 41-01).
2. Inspect seat tracks for cracks. Replace all damaged tracks.
3. Remove or peel back carpet/mats. (See Shop Manual Section 45-26).
4. Inspect all seat track-to-floor pan attachment nuts. Weld any loose nuts to floor pan.
5. Inspect top side of floor pan for cracks:
If floor pan is not cracked, go to Step B-1 and reinforce both sides with small reinforcements.
If floor pan is cracked, go to Step B-10.
FIGURE 1:
B. Small Reinforcement Installation Procedure
1. Place small reinforcement on top of the floor pan sheet metal. (See Figure 1). Remove any floor pan deadener from under the reinforcement.
2. Attach the small reinforcement to the floor pan with 1 seat track nut and flat washer.
3. Use the holes in the reinforcement as a guide. Drill a 0.255 diameter (6.5 mm drill) hole through the reinforcement and the floor pan.
4. Install and set a pop rivet immediately after drilling hole. Repeat drilling/riveting for each hole.
5. Remove the seat track bolt and washer when all holes are completed.
6. Repeat procedure for other side of floor pan.
7. Reinstall carpets/mats.
8. Reinstall both seals.
9. Raise truck and spray Super Seal on bottom side of floor pan to cover all pop rivets. 10.
If driver's side is cracked, use large reinforcement (FOTZ-1811299-A). See Section C.
Use small right side reinforcement (See Step B-1) to strengthen passenger's side floor pan.
If passenger's side is cracked, use large reinforcement (FOTZ-1811298-B). See Section C.
Use small left side reinforcement (See Step B-1) to strengthen driver's side floor pan.
C. Large Reinforcement Installation Procedure - Floor Pan Cracked (Either Side)
1. Remove heat bonded deadener from floor pan and clean the floor pan surface with 3M General Purpose Adhesive Cleaner.
2. Apply 3M Joint and Seam Spaler on top of crack.
3. Clean bottom surface of reinforcement plate with 3M General Purpose Adhesive Cleaner.
ATTACHMENT TO:
OWNER NOTIFICATION PROGRAM B93
ATTACHMENT III-2
FIGURE 2:
C. Large Reinforcement Installation Procedure (Continued)
4. Apply 1/4"-3/8" (6.3-9.5 mm) bead of 3M Structural Adhesive to the bottom surface of reinforcement. (See Figure 2).
NOTE: A 3M AUTOMIX APPLICATOR GUN CAN BE PURCHASED FROM YOUR LOCAL 3M SUPPLIER. THE APPLICATOR GUN IS REQUIRED TO APPLY THE STRUCTURAL ADHESIVE.
ADHESIVE HARDENS WITHIN 30 MINUTES. COMPLETE INSTALLATION STEPS AS SOON AS POSSIBLE BEFORE ADHESIVE CURES.
5. Place large reinforcement on top of floor pan.
6. Attach the reinforcement to the floor pan with the four (4) seat track mounting bolts and flat washers.
FIGURE 3:
7. Using the numbered locations shown in Figure 3. Drill through the reinforcement and floor pan. Install and set a pop rivet after drilling each hole. Drill the remaining 27 holes in the reinforcement and floor pan. Install and set 27 pop rivets.
8. Remove the four (4) seat track bolts and washers.
9. Reinstall carpets/mats.
10. Reinstall both seats.
11. Raise truck and spray Super Seal on bottom side of floor pan to cover all pop rivets and all visible cracks.