3. Start the engine and idle at low
RPM for 2 min.
4. Top-off surge tank to full cold line
while idling.
5. Run engine at higher idle until
engine fan turns on and allow
thermostat to open.
6. Reduce idle to low RPM and top-off
surge tank full cold line.
7. Run Engine at higher idle for 10
min.
8. Reduce idle to Low RPM and top-
off surge tank to full cold line.
9. **Allow engine to cool and top-off
surge tank full cold line if
necessary.
10. Replace the Fill Cap
11. **If Low Coolant Alarm is
consitently triggering, allow engine
to cool to outside air temperature ,
then top off surge tank to full cold
line.
NOTE
If the coolant frequently needs top-
ping-up or there are any signs of cool-
ant leakage, consult a PACCAR Serv-
ice dealer.
Drive Belts
ENGINE MAINTENANCE - Maintenance Procedures
86 Y53-1166-1M1 (10/2020)
2
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