SPACER 5K0987 - Caterpillar

System Operation Description:If any of the following conditions have occurred, calibrate the speed/timing sensors:
Replacement of the Electronic Control Module (ECM)
Servicing of the engine timing gears
Replacement of either of the speed/timing sensors
Active 261-13 Engine Timing Calibration requiredThere are two speed/timing sensors that provide information about the engine speed and the crankshaft position to the ECM. Each sensor generates a pulse signal as the timing ring rotates past the pickups of the sensors (slipheads). A secondary speed/timing sensor allows the engine to continue to operate if there is a failure of the primary speed/timing sensor. If both speed/timing sensors would fail, the ECM would discontinue power to the unit injectors.The ECM provides the engine speed/timing sensor with 12.5 1.0 VDC. A unique tooth on the timing reference gear generates a unique duty cycle. The signal provides the ECM with information on the engine position.
Illustration 1 g00816818
SchematicTest Step 1. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the data link connector.
Check for any active diagnostic codes.Expected Result:No active diagnostic codes are present.Results:
OK - No active diagnostic codes are present.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. 261-13 Engine Timing Calibration required is not one of the active diagnostic codes.Repair: Repair the active diagnostic codes.STOP
Not OK - A 261-13 Engine Timing Calibration required and other active diagnostic codes are present.Repair: Repair the active diagnostic codes. The 261-13 Engine Timing Calibration required may remain active. Repeat Test Step 1.Test Step 2. Calibration Procedure
Remove the timing calibration plug from the flywheel housing.
Examine the flywheel through the timing calibration hole. Ensure that the probe is not inserted into the timing pin hole. If necessary, turn the engine.
Install the 6V-3093 Transducer Adapter into the timing calibration port in the flywheel housing.
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.
Insert the 6V-2197 Magnetic Transducer through the 6V-3093 Transducer Adapter. Insert the transducer until contact is made with the surface of the flywheel. Move the transducer 1.0 mm (0.04 inch) away from the flywheel.
Tighten the nut on the 6V-3093 Transducer Adapter .
Connect the 7X-1695 Cable from the engine timing calibration probe to the connector P26.
Start the engine. Allow the engine to warm up enough to exit cold mode operation.
Select "Service" from the main menu on Cat ET. Select "Calibrations" from the drop-down menu. Select Timing Calibration.
Press the "Continue" button on Cat ET. Wait until Cat ET indicates that the ECM has calculated the timing reference.Note: Engine speed will be set to 800 rpm by the ECM during the calibration.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.STOP
Not OK - The timing did not calibrate. Proceed to Test Step 3.Test Step 3. Static Timing