COUPLING 7N2558 - Caterpillar

Table 1
Tools Needed Quantity
9S-9082 Engine Turning Tool 1
Illustration 1 g00283387
Left rear view of engine
(1) Flywheel housing
(2) Engine speed/timing connector
(3) Engine speed/timing sensor
Disconnect engine speed/timing connector (2). Inspect the connector for the following damage: corrosion, bent pins and sockets, missing pins and sockets and faulty wires.
Remove engine speed/timing sensor (3) from flywheel housing (1).
Examine the plastic end of the sensor for signs of wear or for contaminants such as metal filings. Clean the sensor, if necessary. The plastic end of the engine speed/timing sensor should not show wear that is greater than 0.051 mm (0.0020 inch) from the face.
Use a screwdriver to carefully pry the plastic sensor end to the fully extended position. The fully extended position is approximately 4.75 mm (0.187 inch) beyond the metal housing of the sensor.
Grasp the plastic end of the sensor. Wiggle the sensor from one side to the other side in order to check for play. There should be no looseness.
Gently push in on the plastic end of the sensor. The plastic end of the sensor should be firm. The plastic end of the sensor should resist any retractable movement. If there is no resistance, replace the sensor.
If the sensor end is not fully extended, use a screwdriver to carefully pry the plastic end of the sensor to the fully extended position. Note: Damage to the sensor can result if the sensor slip head is installed in a slot on the timing ring. Make sure that a tooth of the timing ring is visible in the mounting hole of the sensor prior to installation.
Examine the O-ring seal at the base of the sensor threads. If the seal is missing or damaged, install a new O-ring seal.
Install the engine speed/timing sensor into the flywheel housing. Tighten the sensor to a torque of 40 5 N m (30 4 lb ft). The tip must rest against the timing reference ring.
Connect engine speed/timing connector (2). Note: Be sure that the lock ring for the engine speed/timing connector is properly snapped.Note: The electronic injection timing must be recalibrated after the reinstallation of the engine speed/timing sensor. Refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".