BUSHING 7T4134 - Caterpillar

Use this procedure if one of the diagnostic codes in Table 1 is active. Also use this procedure if any of the following conditions have occurred:
Replacement of the Electronic Control Module (ECM)
Servicing of the engine timing gears
Replacement of either of the speed/timing sensors
Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
22-13 Timing Sensor : Calibration Required     The engine speed/timing sensor has not been calibrated.     This will not keep the engine from running. The fuel injection timing may be out of adjustment.    
261-13 Engine Timing Calibration : Calibration Required     The engine speed/timing sensor needs to be calibrated.     This will not keep the engine from running. The fuel injection timing may be out of adjustment.    The engine speed/timing sensors provide information to the ECM by generating pulse signals as the timing reference ring rotates past the magnetic pickups on the sensors. A unique tooth on the timing reference ring passes by the engine speed/timing sensor. The engine speed/timing sensors provide a frequency that is directly proportional to engine speed (rpm). The engine speed/timing sensor produces a duty cycle output. This duty cycle provides the ECM with information on the crankshaft position.The secondary engine speed/timing sensor provides continuous operation of the engine if the primary engine speed/timing sensor fails. The loss of signals from both engine speed/timing sensors will prevent the ECM from actuating the injectors.Timing calibration is accomplished by installing a magnetic transducer into the side of the engine block and performing the "Timing Calibration" on Caterpillar Electronic Technician (ET). The transducer senses a special slot on the crankshaft counterweight. The transducer is connected to the ECM through a connector in the engine harness. The connector is located near the ECM on the engine harness.Check for active diagnostic codes and/or for logged diagnostic codes. Troubleshoot any diagnostic codes that are present before continuing with this procedure.
Illustration 1 g01410028
Installation of the TC probe (1) Notch (2) Crankshaft counterweight (3) Transducer adapter (4) O-ring (5) Timing calibration probe (6) Engine block (rear view) (A) Air gap 1 mm (0.0394 inch)
Table 2
Required Special Tools    
Part Number    Description    
6V-2197     Magnetic Transducer (Timing Calibration Probe)    
7X-1695     Cable (Timing Calibration)    
7X-1171     Transducer Adapter    
9S-9082     Engine Turning Tool    
Install the 7X-1171 Transducer Adapter ..
Remove the electrical power from the ECM.
Use the 9S-9082 Engine Turning Tool to put either the No. 1 piston or the No. 6 piston at top center. Refer to Systems Operation/Testing and Adjusting, "Finding Top Center Position for No. 1 Piston" for the correct procedure. After the top center position has been located, rotate the engine in the opposite direction of the correct engine rotation for 60 degrees.Note: Normal engine rotation is counterclockwise as the engine is viewed from the flywheel end.
Remove the timing calibration plug.
The plug for the 3176E engine and the 3196 engine is located in the No. 4 cylinder