Turbocharger - Mack Granite GU Series Operator's Handbook Manual

MAINTENANCE AND LUBRICATION 267

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. Remove turbo air intake duct and oil line connection at turbo.
2. Fill oil inlet fitting to overflow with clean engine oil.
3. Using fingers at compressor wheel, carefully spin and wiggle the turbo
shaft to distribute the oil over all bearing surfaces.
4. Reconnect air intake duct and again fill turbo oil port to overflow, connect oil
line and start engine.
5. Operate engine at low idle for at least three minutes before increasing
RPM or driving the vehicle.