MQ Power WHISPERWATT DCA25SSIU4FC8 Operation Manual page 44

DRAINING THE ENGINE COOLANT
WARNING
DO NOT remove the pressure cap from the
radiator when the engine is hot! Wait until
the coolant temperature is below 120°F
(50°C) before removing the pressure cap.
Heated coolant spray or steam can cause
severe scalding and personal injury.
1. Remove the radiator pressure cap (Figure 71) only
when the coolant temperature is below 120°F (50°C).
CORRECT
180
140
220
°F
100 260
WATER TEMP
PRESSURE
CAP
Figure 71. Radiator Pressure Cap Removal
2. Open the cabinet door and remove the coolant drain
bolt and O-ring (Figure 72), then allow the coolant to
drain into a suitable container.
2 5
Figure 72. Draining Engine Coolant
3. After the coolant has completely drained, reinstall the
coolant drain bolt and O-ring.
4. Reinstall the radiator pressure cap and tighten securely.
PAGE 44 — DCA25SSIU4FC8 60 HZ GENERATOR • OPERATION MANUAL — REV. #0 (08/23/22)
180
140
220
°F
100 260
WATER TEMP
COOLANT
DRAIN BOLT
AND O-RING
5. Flush out the radiator and replace the coolant. Refer
to Cleaning the Coolant Passages and Filling the
Coolant System in the Isuzu engine owner's manual.
RADIATOR CLEANING
The radiator (Figure 73) should be spray-cleaned with a
high-pressure washer when excessive amounts of dirt
and debris have accumulated on the cooling fins or tube.
When using a high-pressure washer, stand at least 5 feet
(1.5 meters) away from the radiator to prevent damage to
the fins and tube.
NOTICE
It may be necessary to remove additional generator
components in order to access the radiator for cleaning.
Figure 73. Radiator Cleaning
MAINTENANCE