FRAME A. 3S7898 - Caterpillar

Be sure to extend the sliphead before installing the Engine Speed/Timing Sensor. Also check that the Timing Gear is in a position that will not allow the sliphead of the Engine Speed/Timing Sensor to protrude into one of the slots of the Timing Gear. This is done visually with a flashlight prior to the installation of the Engine Speed/Timing Sensor. Turn the crankshaft to rotate the Timing Gear, if necessary, to position the gear in a place that will not allow the sliphead to protrude into a slot. If the sensor sliphead does protrude into one of the slots, the sliphead will be broken off as the gear begins to rotate.
Remove the suspect Speed/Timing Sensor.
Inspect the plastic sliphead for damage.
Check the tension. Gently extend the sliphead 3.5 mm (0.14 inch). Return the sliphead to the original position.
Extend the sliphead.
Install the Engine Speed/Timing Sensor.Expected Result:The sliphead should take at least 22 N (5 lb) of force to push in the sliphead from the extended position.Results:
OK - The Engine Speed/Timing Sensor and the sliphead are undamaged. The tension on the sliphead is normal. Reinstall the sensor. Proceed to test step 6.
Not OK - The Engine Speed/Timing Sensor or the sliphead is damaged, or the sliphead has insufficient tension.Repair: Replace the Engine Speed/Timing Sensor. Calibrate the sensor. Refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".STOPTest Step 6. Check the Engine Speed on the ET.
Connect the ET at the service tool connector.
Turn the