Installation Of The 129-6628 Speed/Timing Sensor On 3406E Engines{1907} Caterpillar

Engines:

3406E (S/N: 5EK; 9NN; 6BR; 9WR; 4AS; 5DS; 6TS; 1LW)

Introduction

This Special Instruction provides instructions for the installation of the 129-6628 Speed/Timing Sensor on 3406E Engines.

Note: This Special Instruction should only be used for 3406E Engines. The 129-6628 Speed/Timing Sensor is used on other engine models. The 3406E is the only model that uses the 126-8481 Washer .

Do NOT perform any procedure that is outlined in this Special Instruction until the information is read and understood.

Instructions

Use the following procedure in order to install the engine speed/timing sensor:

1. Extend the sliphead before you install the engine speed/timing sensor.

2. Check the position of the speed/timing wheel.

   Before the sensor is installed, ensure that the speed/timing wheel is in the correct position. The sliphead should not be allowed to fill one of the slots of the speed/timing wheel. Visually inspect the area with a flashlight.

   If it is necessary, turn the crankshaft in order to rotate the speed/timing wheel so that the sliphead is not allowed to fill the slot.

   Note: If the sliphead fills one of the slots in the speed/timing wheel, the sliphead will be broken off as the speed/timing wheel begins to rotate.

3. Install the sensor in order to set the sliphead into position. Tighten the sensor to a torque of 40 ± 5 N·m (30 ± 4 lb ft).

4. Remove the sensor. Be careful not to bump the sliphead.

5. Place the 126-8481 Washer on the sensor.

6. Install the sensor and the washer. Be careful not to bump the sliphead. Tighten the sensor to a torque of 40 ± 5 N·m (30 ± 4 lb ft).

   Note: The washer will prevent the sliphead from contacting the gear.

7. Follow the proper procedure for Engine Timing in order to calibrate.