Rear Axle Hub Seal - Lubricant Leaks
Article No. 91-6-7
03/18/91
^ AXLE - NEW HUB SEAL AND HUB SEAL REPLACER TOOL - VEHICLES WITH 10.25 INCH RING GEAR, FULL - FLOATING REAR AXLES
^ LEAKS - AXLE LUBE - 10.25 INCH RING GEAR, FULL - FLOATING REAR AXLES
LIGHT TRUCK: 1985-91 F-250, F-350
ISSUE: A new hub seal and a hub seal replacer tool are now available for service. The new hub seal is designed to improve sealing when properly installed using the new hub seal replacer tool.
ACTION: Install a new hub seal (FOTZ-1177-A) with the new hub seal replacer tool (T91T-1175-A). Refer to the following inspection list and service procedure for details.
NOTE: DO NOT USE THE OLD HUB SEAL REPLACER TOOL (T85T-1175-AH). IT IS NOT DESIGNED TO INSTALL THE NEW SEAL. THE NEW HUB SEAL REPLACER TOOL IS AVAILABLE IN THE 1991 DEALER ESSENTIAL SERVICE TOOL KIT AND IS THE ONLY TOOL APPROVED TO INSTALL THE NEW SEAL.
INSPECTION PRIOR TO SEAL INSTALLATION
Prior to seal installation, make sure that the following items are checked and servicing action taken where indicated.
^ Inspect the outer diameter of the hub seal to be sure that it is dry and free of oil and grease.
^ Check the hub bore to be sure it is free of grease, dirt and debris.
^ Remove any nicks or burrs from the hub bore.
^ Inspect the inner and outer bearing for damage and replace as required.
^ Pack each hub bearing cone and roller with a bearing packing tool using XG-1-C grease.
^ Make sure that no residual grease from freshly greased bearings gets into the hub bore.
^ Prior to installing the hub assembly, clean the spindle thoroughly and inspect the seal and bearing journals for nicks and/or scratches. Remove nicks or scratches using crocus cloth or similar material.
^ Wipe spindle clean and lightly oil with clean axle lube or engine oil.
Figure 1:
REMOVAL & INSTALLATION PROCEDURE
1. Install the hub in a soft jawed vice.
2. Remove the hub seal as shown in Figure 1.
CAUTION: CARE MUST BE TAKEN NOT TO DAMAGE THE HUB SEAL BORE WITH THE SEAL REMOVAL TOOL.
Figure 2:
3. Thoroughly clean and inspect the hub bore, Figure 2.
CAUTION: MAKE SURE THE HUB BORE IS FREE OF DIRT, GREASE, BURRS OR NICKS.
NOTE: HUB BEARINGS MUST BE PRELUBED WITH GREASE PRIOR TO INSTALLATION. USE XG-1-C GREASE OR EQUIVALENT.
4. Pack each bearing cone and roller assembly with a bearing packing tool.
Figure 3:
5. Install the seal in the hub with the Ford logo facing up, Figure 3.
CAUTION: HUB SEAL MUST BE FREE OF DIRT OR GREASE.
Figure 4:
6. Install the hub oil seal on the hub seal installer tool, T91T-1175-A, Figure 4.
Figure 5:
7. Insert the tool with the seal squarely into the hub, Figure 5.
Figure 6:
8. Hold the tool straight. Strike the handle until the hub seal is fully seated (until tool strikes hub), Figure 6.
CAUTION: INSTALL NEW SEAL IF SEAL IS MISALIGNED DURING OR AFTER INSTALLATION.
It is extremely important that the 1991 F-Series Shop Manual procedures be followed when installing the hub assembly.
CAUTION: THE SPECIFIED TORQUING AND BACKING OFF OF THE HUB NUT IS CRITICAL IN ORDER TO PERFORM THE REPAIR CORRECTLY.
NOTE: ALWAYS TURN THE HUB WHILE TIGHTENING THE HUB NUT. ONCE THE SPECIFIED TORQUE 55-65 LB.FT., (75-88 N-m) IS ACHIEVED, RATCHETING BACK ON THE HUB NUT VARIES DEPENDING ON WHETHER THE HUB BEARINGS ARE NEW OR USED. BACK OFF 5 CLICKS FOR NEW BEARING AND 8 CLICKS FOR USED BEARINGS.
Make sure hub nut wrench tool (T85T-4252-AH) is used as shown in the Shop Manual procedure. Consult The 1991 F-Series Light Truck Shop Manual, Section 05-02B, for service procedures and torque specifications.
PART NUMBER PART NAME CLASS
FOTZ-1177-A Hub Seal B
XG-1-C Grease (14 oz. cartridge, Pkg. V
60)
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 509000