18SP575 Turbocharger Speed Sensor for the Series EGR Engine

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1 18SP575 Turbocharger Speed Sensor for the Series EGR Engine Introduction Detroit Diesel Corporation has released an Exhaust Gas Recirculation (EGR) system on the Series engine. The Variable Nozzle Turbocharger (VNT) uses a speed sensor. See Figure 1. The turbocharger speed sensor screws through the wall of the center housing, passes through the drain cavity and protrudes into an opening in a bearing spacer which stops the bearing spacer from rotating. A machined flat on the rotor shaft triggers an electrical impulse to the ECM for every turbocharger shaft revolution. Figure 1 Turbocharger Speed Sensor Removal of the Speed Sensor For Series 60 engines equipped with EGR systems, remove the turbocharger speed sensor from the turbocharger as follows: NOTE: Servicing of the speed sensor is limited to its replacement. 18SP575 Page 1 of 6

2 NOTE: If the turbocharger speed sensor is difficult to access, removal of the turbocharger may be required. Refer to section of the S60 Service Manual, 6SE Clean the center housing area around the base of the speed sensor. See Figure Turbocharger Speed Sensor 2. Center Housing Figure 2 Location of Speed Sensor 2. Disconnect the sensor wire from the main harness. 3. Place turbocharger speed sensor socket J on speed sensor while threading the lead wire through the slot in the side of the socket. See Figure 3. 18SP575 Page 2 of 6

3 1. Sensor Lead Wire 2. Turbocharger Speed Sensor Bracket Figure 3 Removal of Turbocharger Speed Sensor NOTICE: Ensure the turbocharger shaft is secured and not rotated when the turbocharger speed sensor is removed from the bearing spacer. Turning the shaft without the sensor in place can rotate the bearing spacer. If the bearing spacer hole is not properly positioned to line up with the speed sensor (see Figure 4), the sensor and turbocharger bearings will be damaged during sensor installation. 18SP575 Page 3 of 6

4 1. Bearing Spacer 3. Turbocharger Speed Sensor 2. Spacer Hole Figure 4 Turbocharger Speed Sensor Position 4. Loosen and remove the sensor while avoiding excessive pulling, bending or twisting of the sensor lead wire. Installation of the Speed Sensor Install the turbocharger speed sensor in the center housing as follows: 1. Place the turbocharger speed sensor socket J over the head of the turbocharger speed sensor with the lead wire through the slot on the side of the socket. 2. If the turbo shaft has not been rotated since the speed sensor removal, the bearing spacer hole will be in proper alignment for speed sensor replacement Go to step 3. If the turbo shaft has been rotated, then inspect the threaded hole for the speed sensor and ensure the hole in the bearing spacer is aligned and the rotor shaft is visible. If not, rotate the bearing spacer until the bearing spacer hole is lined up before proceeding to the next step. 3. Manually insert the turbocharger speed sensor into the threaded hole of the center housing wall. Turn the sensor until the sealing lip on the underside of the sensor seats against the flat on the center housing and the sensor is finger tight. 18SP575 Page 4 of 6

5 4. Turn the turbocharger rotor to ensure it spins freely with minimal resistance. If binding occurs, repeat speed sensor installation. NOTICE: Ensure the turbocharger rotor turns freely. If the shaft binds, the speed sensor is not aligned with the bearing spacer and damage will occur to the shaft and speed sensor. 5. Tighten the speed sensor to N m ( lb in.) torque. 6. Again, turn the turbocharger rotor to ensure it spins freely. If binding occurs, it is not aligned properly. Refer to step 3. 18SP575 Page 5 of 6

6 Copyright 2003 Detroit Diesel Corporation. Detroit Diesel, DDC, Series 60, and the spinning arrows design are registered trademarks of Detroit Diesel Corporation. All other trademarks are the property of their respective owners. 18SP As technical advances continue, specifications will change. All rights reserved. Printed in U.S.A. 18SP575 Page 6 of 6