5033878 JOHNSON SHIM, TAPPET (T:2.68mm)

Table 1
Required Special Tools    
Part Number    Description    
6V-2197     Magnetic Transducer    
7X-1695     Cable    
7X-1111     Grommet    
9S-9082     Engine Turning Tool    
170-3519     Harness    Test Step 1. Install the Transducer Adapter
Turn the key switch to the OFF position.
Remove the timing calibration plug from the left or the right front face of the flywheel housing.
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 Magnetic Transducer on the Engine
Put a 2D-6392 O-Ring Seal on the end of the magnetic transducer.Note: A small amount of clean engine oil will allow the seal to slide onto the transducer more easily.
Push the magnetic transducer through the adapter until the magnetic transducer comes in contact with the outermost portion of the flywheel timing calibration ring. Move the O-ring seal downward against the adapter.
Withdraw the magnetic transducer 1.0 mm (0.04 inch) and hand tighten the nut on the adapter sleeve in order to secure the magnetic transducer in place.
Check that the probe is properly installed and snug. The probe should not move when the engine is started.
Connect the 6V-2197 Magnetic Transducer to the 7X-1695 Cable .
Install the 170-3519 Harness. Refer to Special Instruction, REHS0399, "Installation Of The 170-3519 Timing Calibration Harness Assembly On The 3126B Truck Engine" for the installation procedure.Results:
OK - Proceed to Test Step 3.Test Step 3. Start the Engine and Allow the Coolant to Reach Operating Temperature
Start the engine and run at low idle until the engine has warmed up enough to exit Cold Mode operation. The Cat ET status screen will display "COLD MODE" in the upper corner when Cold Mode operation exists. The engine will adjust idle rpm from Cold Mode idle to the programmed Low Idle rpm when Cold Mode operation is complete.
Check for active diagnostic codes. Use the procedures in this manual to troubleshoot and repair any active diagnostic codes before attempting a calibration check. The engine must not have any diagnostic fault conditions that are present during the timing calibration except the following condition:
22-13 Engine Speed Signal Calibration Not Performed (42)
After the engine has warmed up, set the engine speed to 1100 rpm by using the cruise control switches or by using the accelerator pedal.Note: The engine rpm must be steady within the 1000 to 1200 rpm range in order to perform a timing calibration.Results:
OK - Proceed to Test Step 4.Test Step 4. Connect Cat ET
Connect Cat ET to the data link connector.
After the engine has exited Cold Mode operation, access the "Timing Calibration Screen" on Cat ET. Access the following display screens in order:
"Service"
"Calibrations"
"Timing Calibration"Note: To perform a timing calibration, the engine rpm must remain as steady as possible at approximately 1100 rpm. This can be performed by using the idle engine governor or a steady foot on the accelerator pedal. Any changes to engine rpm that are more than 100 rpm will slow down the procedure. These changes will also reduce the accuracy of the procedure.
Connect the 7X-1695 Cable for the 6V-2197 Magnetic Transducer to the 170-3519 Harness .
Ensure that all of the connections are made correctly.Results:
OK - Proceed to Test Step 5.Test Step 5. Calibrate the Speed/Timing Sensor
To calibrate the timing to the correct setting, select "space" on Cat ET. Wait until Cat ET indicates that the timing is "CALIBRATED".Note: If Cat ET displays "CALIBRATION UNSUCCESSFUL", the electronic injection timing has not been set. Recheck the tool installation and tool operation and try again to calibrate electronic injection timing. If the crankshaft and camshaft gears have been reassembled incorrectly, the engine will not calibrate. If the timing calibration has been successfully completed, do not exit the timing calibration screen on Cat ET until you have disconnected the 7X-1695 Cable for the 6V-2197 Magnetic Transducer from the 170-3519 Harness .Expected Result:The timing calibration procedure was completed successfully.Results:
OK - The timing calibration procedure was completed successfully. Proceed to Test Step 6.
Not OK - Repair: Perform the following procedure:
Verify that the engine rpm was stable during the testing ( 50 rpm). If the engine rpm was unstable or the engine rpm could not be controlled within 50 rpm because of mechanical factors or electrical factors, refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".
If all of the problems have been corrected but the timing can not be calibrated, check the cable of the 6V-2197 Magnetic Transducer and check the 6V-2197 Magnetic Transducer in order to verify that the Magnetic Transducer is not bent. Also check the installation of the 170-3519 Harness for proper connection. If the 6V-2197 Magnetic Transducer is not bent, restart this procedure.STOPTest Step 6. Disconnect the 6V-2197 Magnetic Transducer Before Exiting the "Monitor/Calibrate Timing" Screen on Cat ET
Disconnect the timing probe from the 170-3519 Harness .
Exit the timing calibration screen on Cat ET.Note: Exiting the timing calibration screen on Cat ET will drop the engine rpm to the programmed low idle if the cruise control switches were used to maintain engine rpm during calibration. This is normal.Expected Result:The magnetic transducer was disconnected before exiting the timing calibration screen on Cat ET.Results:
OK - STOP
Not OK - If the magnetic transducer is still installed after exiting the timing calibration screen on Cat ET, vehicle speed diagnostic codes may be generated.Repair: If vehicle speed diagnostic codes are generated, the vehicle speed diagnostic codes should be cleared.STOP