F 250 2WD Pickup V8-351 5.8L VIN H 4-bbl HP (1985)
REQUIRED, A NEW COLLAPSIBLE SPACER AND PINION NUT MUST BE INSTALLED.
NOTE:
REFER TO DEALER MASTER PARTS CATALOG FOR CORRECT RING AND PINION GEARSET USAGE IF GEARSET REPLACEMENT
IS REQUIRED.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992 Models, Basic And Powertrain Warranty Coverage For All Other
Models
OPERATION
DESCRIPTION
TIME
940821A
Inspect And Install New Companion
0.8 Hr.
Flange, Pinion Seal And Pinion Nut
940821B
Inspect And Install New Ring And
2.6 Hrs.
Pinion Set With New Pinion Bearing,
Pinion Seal And Nut
DEALER CODING
BASIC PART NO.
CONDITION CODE
4851
38
OASIS CODES: 509000, 510000
Technical Service Bulletin # 94821
Date: 940420
Differential - Oil Leaks At Pinion Nut
Article No. 94-8-21
^
AXLE - FORD 10.25 - OIL LEAKS AT PINION NUT (PAST SPLINES)
^
NUTS - REAR AXLE PINION - LOOSE OR BACKING OFF
LIGHT TRUCK:
1985-92 F-250, F-350
ISSUE:
Rear axle pinion nuts may back off or axle lube may leak at the pinion nut (past splines) on vehicles with 10.25" ring gear axles. This condition can
occur at relatively low mileage under severe duty use, with the incident rate increasing in manual transmission applications. This concern may be due to a
loose fit between pinion gear and companion flange splines.
ACTION:
If, upon inspection, axle lube is leaking at the pinion nut (past splines), and there is companion flange spline-to-pinion spline play, indicating a loose
pinion nut and potentially worn splines, install a new companion flange, pinion seal and pinion nut. Refer to the following procedure for service details.
NOTE:
IF THE NEW COMPANION FLANGE IS A SLIP FIT, THIS INDICATES EXCESSIVE PINION SPLINE WEAR AND THE RING AND
PINION GEARSET MUST BE REPLACED. TO ENSURE PROPER FIT, THE NEW COMPANION FLANGE SHOULD NEVER ENGAGE
THE PINION SPLINES MORE THAN 50% DURING HAND INSTALLATION. IF THE NEW COMPANION FLANGE INSTALLS TOO
EASILY ON THE PINION SPLINES (MORE THAN 50%), INSTALL NEW (4209) GEARSET, FRONT AND REAR PINION BEARINGS,
PINION SEAL AND PINION NUT.
Perform the following procedure to replace the pinion seal, companion flange and pinion nut:
NOTE:
REFER TO THE APPROPRIATE MODEL YEAR LIGHT TRUCK SERVICE MANUAL FOR SERVICE PROCEDURES AND SPECIAL
SERVICE TOOL USAGE.