SEAL 1472354 - Caterpillar

Illustration 1 g00667337
Installation of the speed sensor
(1) Speed Sensor
(2) Locknut
(3) Magnetic Pickup
(4) Flywheel Gear
(5) Flywheel HousingPerform the following procedure to replace and/or adjust the speed sensor.
Turn the key start switch and the battery disconnect switch to the OFF position.
Loosen locknut (2) and remove speed sensor (1). Inspect the sensor for damage. Replace the sensor if magnetic pickup (3) is damage or has metal embedded into the tip.Note: Inspect the connector, see Testing and Adjusting, "Electrical Connector - Inspect".
Inspect the gear train for damage by looking through the speed sensor hole and flywheel housing cover. Rotate the gear train to inspect all the teeth. After inspection, ensure that a tooth is aligned with the speed sensor hole.Note: Use a 9S-9082 Engine Turning Tool and 1/2 inch drive ratchet wrench to turn the engine flywheel. Turn the flywheel in the direction of engine rotation, counterclockwise, as viewed from the flywheel end. A 178-8615 Socket may be used to turn the crankshaft if access to the flywheel housing cover is limited.Note: If damage can be seen to the gear teeth, remove the pump for further inspection of the flywheel. Refer to Disassembly and Assembly, "Pump Drive Group - Remove".
Measure distance between flywheel tooth and the sensor base on the flywheel housing. From the pickup end of the sensor, mark that distance on the sensor body. This measurement will help ensure that the sensor stops on the tooth and not because the sensor becomes stuck on the threads.
By hand, screw speed sensor (1) into the threaded opening in flywheel housing (5) until magnetic pickup (3) contacts a tooth on flywheel gear (4).
Turn speed sensor (1) approximately 3/4 of a rotation in the counterclockwise direction. This rotation sets the air gap between magnetic pickup (3) and flywheel gear (4). The air gap specification is 0.53 mm (0.021 inch) to 0.83 mm (0.033 inch).
Temporarily tighten locknut (2).Note: Do not allow speed sensor (1) to turn as locknut (2) is tightened.
Position the Engine Speed Dial at position 1 (LOW IDLE position). Refer to Testing and Adjusting, "Engine Performance - Test - Engine Speed" for the Low Idle rpm specification.
Turn the key start switch and the battery disconnect switch to the ON position and start the engine.
Calibrate the Engine Speed. Refer to Troubleshooting, "Calibration" in this manual.
Observe the "Performance" menu in the monitor and verify that the correct engine rpm is displayed. Refer to Testing and Adjusting, "Engine Performance - Test - Engine Speed" for the Low Idle rpm specification.
If the correct rpm is displayed, tighten locknut (2) to a torque of 25 N m (18.4 lb ft). Sensor adjustment is complete.Note: Do not allow speed sensor (1) to turn as locknut (2) is tightened.
If the correct rpm is not displayed, the sensor requires readjustment. Stop the Engine.
Loosen the locknut on the speed sensor. Turn the speed sensor clockwise 1/4 turn.Note: The air gap must not decrease below 0.53 mm (0.021 inch).
Repeat 2 through 12 until the correct rpm is displayed.Note: If diagnostic code 190-8