3176C Engine for the R1600G and the R1700G Load Haul Dumps Timing - Calibrate Caterpillar

Timing - Calibrate

Use this procedure if the diagnostic code 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    
261-13 Engine Timing Calibration 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.    

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. To prevent any unnecessary down time, any problems with the speed/timing circuit should be repaired at the earliest possible convenience.

Timing calibration is accomplished by installing a magnetic transducer into the side of the engine block and performing the "Timing Calibration" on AVSpare 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 1g01410028

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    

  1. Install the 7X-1171 Transducer Adapter ..

    1. Turn the keyswitch to the OFF position.

    1. 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.

    1. Remove the timing calibration plug. The plug is located in the No. 4 cylinder on the right side of the cylinder block.

    1. Install the 7X-1171 Transducer Adapter into the hole for the plug.

  1. Install the 6V-2197 Timing Calibration Probe on the Engine.


      If the crankshaft is not in the correct position when the 6V-2197 Timing Calibration Probe is installed, the probe will be damaged when the engine is started.

    1. Put the 2D-6392 O-Ring Seal on the end of the timing calibration probe.

      Note: A small amount of clean engine oil will allow the seal to slide onto the sensor more easily.

    1. Push the probe through the adapter until the probe contacts the outermost portion of the crankshaft counterweight. Move the O-ring seal downward against the adapter.

    1. Withdraw the probe 1.0 mm (0.04 inch) and hand tighten the nut on the adapter sleeve in order to secure the probe in place.

    1. Connect the 6V-2197 Timing Calibration Probe to the 7X-1695 Cable .

  1. Start the Engine and Allow the Coolant to Reach Operating Temperature.

    1. Connect Cat ET to the service tool connector.

    1. Start the engine and run at low idle until the engine is at correct operating temperature.

    1. Check for active diagnostic codes. Use the procedures in this manual for troubleshooting. Repair any active diagnostic codes before you proceed. The engine must not have any diagnostic conditions that are present during the timing calibration except the following condition:

      • 261-13

  1. Connect the Cables for the Timing Calibration Probe.

    1. After the engine has warmed up, access the "Timing Calibration" screen on Cat ET. Access the following display screens in order:

      • "Service"

      • "Calibrations"

      • "Timing Calibration Screen"

    1. Connect the 7X-1695 Cable to the timing calibration probe connector that is located near the ECM.

    1. Ensure that all of the following connections are made correctly:

      • Timing calibration probe

      • Cables for Cat ET and for the communication adapter

  1. Calibrate the Speed/Timing Sensor.

    1. After the engine has reached the correct operating temperature, set the engine speed to 1000 ± 50 rpm. The engine speed must be steady within this rpm range in order to successfully perform a timing calibration. To calibrate the timing to the correct setting, select "Continue" on Cat ET. Wait until Cat ET indicates that the timing is "CALIBRATED".

      Note: If the display for Cat ET reads "CALIBRATION UNSUCCESSFUL", the timing has not been calibrated. Recheck the tool installation and tool operation and try again. If the crankshaft and camshaft gears have been reassembled incorrectly, the engine will not calibrate.

    1. Follow the instructions on the Cat ET screen.

      Note: If the Cat ET screen reads "Could Not Calibrate", the timing has not been set. Verify that the engine speed was stable during the testing (± 50 rpm). If the engine speed was unstable or the engine speed could not be controlled within ± 50 rpm because of mechanical factors or electrical factors, refer to the diagnostic procedure Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".

      If all of the problems have been corrected but the timing can not be calibrated, verify that the probe is not bent. Verify that the probe is installed correctly before restarting this procedure.

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