Mack ASET AC - Pre-Lubricating a Turbocharger after Sitting Idle for an Extended Period of Time

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Page 514

APPENDIX

9. Again, pour clean engine oil into the

turbocharger oil inlet port until overflowing,

and then install the oil supply line.

10. Start the engine and let it run at an idle.

Typically, it should take approximately eight

seconds or less for sufficient oil pressure to

build. Allow the engine to idle for

approximately five minutes before

increasing engine speed or driving the

vehicle.

For ASET™ AC engines, disconnect the

connector from the VTG control valve prior to

starting the engine. This will prevent the

turbocharger from reaching excessive speeds

when the engine is first started. Run the engine

for five minutes, and then shut the engine off.

Reconnect the VTG control valve connector and

use the V-MAC

service tool to clear the fault

code.

Pre-Lubricating a Turbocharger

After Sitting Idle for an Extended

Period of Time

Turbochargers operate at very high speeds,

temperatures and pressures, making lubrication

of the turbocharger bearings extremely important,

particularly for a turbocharger that has just been

installed, and also for a turbocharger that has not

been operated for a period of time.

When the engine is first started after a new

turbocharger has been installed, or after the

engine has been sitting without being started for

a period of time (approximately 30 days or more),

the bearings are basically dry, and damage to the

bearings due to lack of lubrication can occur

during the first couple minutes of operation.

Except in extreme cases, the turbocharger can

continue to operate for several thousand miles,

but will eventually fail due to the damage caused

at the initial start-up.

Before starting the engine on a vehicle that has

been sitting for an extended period of time

(approximately 30 days), pre-lubricate the

turbocharger as follows:

1. Disconnect the oil supply line and the inlet

air duct from the turbocharger.

2. Pour clean engine oil into the oil inlet port

located at the top of the turbocharger until

overflowing.

3. Spin the compressor wheel by hand several

revolutions and wiggle the shaft back and

forth. This will ensure that oil is distributed

over all bearing surfaces.

4. Reconnect the air inlet duct to the

turbocharger.

5. Again, pour clean engine oil into the

turbocharger oil inlet port until overflowing.

6. Reconnect the oil supply line and start the

engine. Allow the engine to idle