Kenworth T410, Driver'S Handbook Manual

Page: 129 / 418

CAT: 8612 November 2019 Page 103
OPERATING INSTRUCTIONS
ENGINE WARM-UP
The purpose of engine warm-up is to allow an oil film to be established
between pistons and liners, shafts and bearings while your engine gradually
reaches operating temperature.
After the engine starts, the electronics will check the coolant temperature
and other engine temperature indicators. If needed, the ECM will take
necessary action(s) to warm the engine up. This is called cold mode.
Depending on the engine type, this may include changing the idle speed
of the engine. It may also reduce the amount of power available.
The engine must have adequate oil pressure within 15 seconds after
starting. If the warning light indicating low oil pressure has not gone out,
the ECM low oil pressure warning activates; or if there is no oil pressure
indicated on a gauge within 15 seconds, shut off the engine immediately
to avoid engine damage. Confirm the correct oil level in the engine sump.
Once the engine has warmed sufficiently to exit cold mode, the engine
should be operated at low rpm and low load until normal operating
temperature is reached. Operating the engine in this way will warm it faster
than if the engine is operated at high rpm and low load.
Slow oil flow to the turbocharger reduces oil available for bearings. Watch
engine oil temperature or pressure gauges for a warming trend before
increasing engine idle rpm.
Check alternator output. The voltmeter must read between 13.8 and 14.2
volts.
Warm-Up Procedure
After you start the engine, idle the engine at approximately 600 rpm while
you check the following vital engine systems:
• oil pressure
• air pressure
• alternator output
Before placing engine under load, continue warm-up with the engine at
900 to 1,000rpm for 3 to 5 minutes.
When a cold engine is started, increase the engine speed (rpm) slowly to
be sure adequate lubrication is available to the bearings and to allow the
oil pressure to stabilise. In extremely cold temperatures, you may have
to increase idle speed.