3412E Petroleum Engine Caterpillar

Use this procedure if a 261-13 Engine Timing Calibration required is active.

Also use this procedure if any of the following conditions exist:

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

• The front gear group has been serviced.

• Either of the speed/timing sensors have been replaced.

The ECM has the ability to calibrate the mechanical differences between the Top Center (TC) of the No. 1 piston and the orientation of the camshaft. A magnetic transducer can be installed into the flywheel housing that will signal the orientation of the flywheel to the ECM. This signal identifies the TC of the No. 1 piston. The ECM also uses the signal that is detected from the speed/timing sensor. This signal identifies the actual orientation of the camshaft.

The signal from the transducer is generated as the flywheel's timing pin hole rotates past the tip of the transducer. The signal from the engine speed/timing sensor is generated by a timing reference ring that is on the back side of the fuel injection pump drive gear.

The two signals are used to calculate a timing offset that is stored in the ECM memory. This timing offset is applied to fuel injection timing for the engine.

Note: A timing calibration will not increase the available engine power.

Table 1 lists the special tools that are required in order to perform this procedure.

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The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.

Test Step 1. Check for Active Diagnostic Codes

1. Turn the keyswitch to the OFF position.

2. Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".

3. Turn the keyswitch to the ON position.

4. Check for any active diagnostic codes.

Expected Result:

No active diagnostic codes are present.

Results:

• OK - No active diagnostic codes are present. A timing calibration is not necessary.STOP

• Not OK - 261-13 Engine Timing Calibration required is the only active diagnostic code that is present. Proceed to Test Step 2.

• Not OK - There are active diagnostic codes. A 261-13 is not one of the active diagnostic codes.

  Repair: Troubleshoot the active diagnostic codes. Make the necessary repairs.

  STOP

• Not OK - A 261-13 and other active diagnostic codes are present.

  Repair: Make the necessary repairs in order to resolve the active diagnostic codes. The 261-13 Engine Timing Calibration required may remain active while the repairs are made.

  Repeat Test Step 1.

Test Step 2. Install the Transducer Adapter

1. Turn the keyswitch to the OFF position.

2. Remove the timing calibration plug from the flywheel housing.

3. Use a flashlight to examine the flywheel through the timing calibration port that is in the flywheel housing. Ensure that the timing pin hole that is machined into the flywheel is not aligned with the hole that is in the flywheel housing. If necessary, rotate the crankshaft in order to cause the misalignment of the two holes.

4. Install the 6V-3093 Transducer Adapter into the timing calibration port that is in the flywheel housing.

Results:

Continue to the next test step.

Test Step 3. Install the Transducer

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NOTICE
Do not install the timing calibration probe over the timing pin hole in the flywheel. Damage to the timing calibration probe will result if the probe is installed over the timing pin hole.

1. Apply clean engine oil to a 2D-6392 O-Ring Seal. Install the O-ring seal on the end of the 6V-2197 Transducer .

2. Insert the 6V-2197 Transducer through the transducer adapter. Insert the transducer until contact is made with the surface of the flywheel. Pull the transducer 1.0 mm (0.04 inch) away from the flywheel.

3. Tighten the nut on the transducer adapter.

4. Connect the 7X-1695 Cable As from the transducer to the P26 TC probe connector.

Results:

Continue to the next test step.

Test Step 4. Calibrate the Engine Speed/Timing

1. Start the engine. Run the engine until the engine has exited cold mode operation.

2. After the engine has warmed up, reduce the engine speed to low engine idle. Access the "Timing Calibration" screen on Cat ET. Access the following display screens in order:
   • "Service"

   • "Calibrations"

   • "Timing Calibration"

3. To calibrate the timing, select "Continue" on Cat ET. Wait until Cat ET indicates that the timing is calibrated.

   Note: Engine speed will be set to 600 rpm by the ECM during the calibration.

4. Press the "Continue" button on Cat ET. Wait until Cat ET indicates that the ECM has calculated the timing reference.

   Note: If Cat ET displays "Calibration Unsuccessful", the electronic injection timing has not been calibrated.

Expected Result:

The timing calibration was successful.

Results:

• OK - The timing calibration was successful.

  Repair: Perform the following procedure:

  1. Set the engine speed to low idle.

  Note: Disconnect the 7X-1695 Cable As before you exit the "Timing Calibration" screen. Otherwise, diagnostic codes may be activated.

  2. Disconnect the 7X-1695 Cable As .

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

  4. Turn the keyswitch to the OFF position.

  5. Remove the transducer and remove the adapter.

  6. Install the plug into the timing calibration port.

  7. Return the engine to service.

  STOP

• Not OK - The timing calibration was unsuccessful.

  Repair: The following conditions can cause the timing calibration to fail:

  • If the crankshaft and camshaft gears have been reassembled incorrectly, the timing will not calibrate.

  • Verify that the timing calibration probe is installed correctly.

  • Verify that the engine speed is correct and that the engine speed is stable. If the engine speed is unstable, refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".

  • There may be a problem with the transducer or with the cables. Obtain a new transducer and/or a new cable and repeat the timing calibration.

  STOP