Rear Axle - Rear Antilock Sensor Fluid Leaks

Article No. ^ LEAK - AXLE LUBRICANT - AT THE REAR
87-7-25 ANTI-LOCK BRAKE SENSOR - 7.5"/8.8"/10.75" AXLES

^ AXLE -REAR - 7.5"/8.8"/10.75" -LUBRICANT LEAKS AT REAR ANTI-LOCK BRAKE SENSOR


LIGHT TRUCK: 1987 F-150/350, BRONCO, BRONCO II

Figure 18 - Article 87-7-25:

ISSUE: Lubricant leaks at the rear axle anti-lock brake system (RABS) speed sensor may be caused by a porous axle housing mounting surface which prevents a good seal. The sensor is located near the top of rear axle carrier between two protective fins, see Figure 18.


ACTION: To correct this, reseal the sensor using the following service procedure.

NOTE: 1983-86 Ranger and Bronco II vehicles serviced with a 1987 level service axle housing assembly should be sealed around the sensing hole plug prior to installation.


1. Remove sensor hold-down bolt. Remove sensor.

2. Clean axle mounting surface, using caution to prevent dirt from entering into axle housing.

3. Remove old O-ring from sensor and install new O-ring. Apply a light film of motor oil to O-ring.

NOTE: Do not let oil run down on sensor flange.

Figure 19 - Article 87-7-25:

4. Apply a continuous bead of silicone rubber sealant (D6AZ-19562-B or equivalent) to inboard base of sensor, Figure 19.

NOTE: Sensor must be installed within 15 minutes of application of silicone or new sealant must be applied.

5. Firmly grasp sensor at sides (do not install by applying force on connector) and push into axle housing, aligning mounting flange hole with threaded hole in axle housing.

6. Install hold-down bolt and tighten to 25-30 ft.lbs. (34-41 N-m).

PART NUMBER PART NAME CLASS

87018-S94 O-Ring - Package of 10 S
D6AZ-19562-B Silicone Rubber Sealant AG

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870725A
TIME: 0.4 Hr.
DLR. CODING: Basic Part No. 4010 - Code: 85