Owners manual

QSB4.5 and QSB6.7 Engine Shutdown
Section 1 - Operating Instructions Page 1-17
Engine Shutdown
General Information
Allow the engine to idle 3 to 5 minutes before shutting it
off after a full-load operation. This allows adequate cool
down of pistons, cylinders, bearings, and turbocharger
components.
NOTE: For engines equipped with an electronic control
module (ECM) ensure the keyswitch is turned off for a
minimum of 70 seconds prior to disconnecting the
continuous (unswitched) battery power supply. If the
unswitched battery power supply is disconnected in less
than 70 seconds after the keyswitch is turned off active
fault codes and incorrect ECM information can occur.
Turn the ignition switch to the OFF position. If the engine
does not shut down, refer to Troubleshooting Symptom
(Section TS) in appropriate Operation and Maintenance
manual.
CAUTION
Failure to follow the correct shutdown procedure may
result in damage to the turbocharger and shorten the
turbocharger life.