3176C and 3196 Engines for Caterpillar Built Machines Caterpillar

Use this procedure if any of the following conditions exist:

• The Electronic Control Module (ECM) has been replaced.

• Work has been performed on the front gear group.

• 261-13 Engine Timing Calibration required is active or logged.

The primary engine speed/timing sensor provides an engine speed signal (rpm) to the ECM. The signal is created as the crankshaft gear rotates past the pickup of the primary engine speed/timing sensor.

The secondary engine speed/timing sensor provides the timing signal to the ECM. The signal is created as the camshaft gear rotates past the pickup of the secondary engine speed/timing sensor. A unique pattern on the gear allows the ECM to determine the crankshaft position. This unique pattern on the gear allows the ECM to determine the top center position of the piston in the No. 1 cylinder.

Timing calibration is accomplished by installing a magnetic transducer into the side of the engine block. The magnetic transducer senses a special slot on the crankshaft counterweight. The magnetic transducer is connected to the ECM through a harness. The harness connector is located near the ECM.

Note: The timing calibration will not affect available engine power. Do not expect a change in power due to the performance of the timing calibration.

Illustration 1	g00803894
Installation of the TC probe

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

1. Turn the keyswitch to the OFF position.

2. Use the 9S-9082 Engine Turning Tool to put either the No. 1 piston or the No. 6 piston at top center. 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.

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

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

Results:

• OK - Proceed to Test Step 2.

Test Step 2. Install the 6V-2197 Timing Calibration Probe on the Engine

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NOTICE
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.

2. 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.

3. 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.

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

Results:

• OK - Proceed to Test Step 3.

Test Step 3. Start the Engine and Allow the Coolant to Reach Operating Temperature

1. Connect Cat ET to the service tool connector.

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

3. 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

Results:

• OK - Proceed to Test Step 4.

Test Step 4. 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"

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

3. Ensure that all of the following connections are made correctly:
   • Timing calibration probe

   • Cables for Cat ET and for the communication adapter

Results:

• OK - Proceed to Test Step 5.

Test Step 5. 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.

Expected Result:

The timing calibration procedure was completed successfully.

Results:

• OK - Proceed to Test Step 6.

• Not OK -

  Repair: Perform the following procedure:

  1. 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 Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".

  2. If all of the problems have been corrected but the timing can not be calibrated, check the cable of the 6V-2197 Transducer and check the 6V-2197 Transducer in order to verify that the transducer is not bent. If the 6V-2197 Transducer is not bent, restart this procedure.

  STOP

Test Step 6. Disconnect the 7X-1695 Cable Before Exiting the " Timing Calibration" Screen on Cat ET

1. Reduce the engine speed to low idle.

2. Disconnect the 7X-1695 Cable from the 6V-2197 Transducer .

3. Exit the "Timing Calibration" screen on Cat ET.

4. Turn the keyswitch to the OFF position. Remove the 6V-2197 Magnetic Transducer and remove the 7X-1171 Transducer Adapter from the timing calibration port. Reinstall the plug into the cylinder block.

Expected Result:

The timing probe was disconnected before exiting the "Timing Calibration" screen on Cat ET.

Results:

• OK - STOP

• Not OK - If the timing probe is still connected to the ECM after exiting the "Timing Calibration" screen on Cat ET, additional diagnostic codes may be generated.

  Repair: If additional diagnostic codes are generated, clear the diagnostic codes.

  STOP