Mack® Truck Pinnacle Series (CXU Series) Operator's Manual 21394648 - PDF DOWNLOAD

262 MAINTENANCE AND LUBRICATION TURBOCHARGER The engine turbocharger operates at very high speed, temperatures and pressure. Turbo bearing lubrication is critical, particularly for a newly installed turbo or one which has not been operated for a period of time and all oil has drained from the bearing and shaft surfaces. To avoid turbocharger bearing failure, the following instructions are recommended: • Start the engine at least every 30 days to ensure turbo bearing lubrication.

Operate engine at low idle for at least three minutes before increasing RPM or driving the vehicle.

• If the engine has not been run for more than 30 days, turbo pre-lube procedure is necessary: 1. Pour clean engine oil into the oil inlet port at the top of the turbocharger until overflowing.

2. Spin the compressor wheel by hand several revolutions while wiggling the shaft back and forth. This ensures that oil is distributed over all bearing surfaces.

3. Install the inlet air duct to the turbocharger, and install the turbocharger drain tube (use a new gasket part No. 590GB2150). Make sure that all clamps are tightened and positioned properly to ensure no leaks in the intake piping.

4. Disconnect the connector from the VTG control valve.

5. Again, pour clean engine oil into the turbocharger oil inlet port until overflowing, and then reconnect the oil supply line.

6. Start the engine and allow it to run at an idle for at least five minutes.

Note: Disconnecting the connector from the VTG control valve prevents the turbocharger from reaching excessive speeds when the engine is first started.

7. After the engine has run for at least five minutes, shut the engine off and reconnect the VTG control valve connector.

8. Use the V-MAC® service tool to clear the fault code.