Advance acoustic 56514925, Service Manual

Page: 106 / 260

Engine System, Gasoline/LPG 106 Service Manual – Advance 7765 / Nilfisk CR1500
Engine Coolant
Checking Engine Coolant
Caution! Do not remove the radiator cap when the engine is hot.
To check the engine coolant level, open the engine cover and observe the coolant level in the coolant overflow
tank. If the level is low, add a 50/50 mix of water and the recommended type antifreeze. Clean the radiator
and oil cooler exteriors every 150 hours by washing with low-pressure water or using compressed air.
Service Note: The oil cooler tips out for easy cleaning.
Replacing Engine Coolant
One possible cause of engine overheating is trapped air in the cooling system. It’s recommended that you use
a Cooling System Tool when changing the engine coolant. The Cooling System Tool pulls a vacuum on the
cooling system prior to filling to prevent air from being trapped in the cooling system.
Note that there are several types of Cooling System Tools. The following instructions describe how to use a
typical type of tool. Refer to the operating instructions included with your particular tool if different than the
example shown here.
1. Connect a
Compressed Air Supply Line
to the fitting on the Cooling System
Tool.
2. Connect the
Coolant Supply Line
to the
Cooling System Tool. Make sure the
Coolant Valve
is closed.
3. Insert and hold the Cooling System
Tool onto the radiator filler neck, then
press the
Air Switch
. The compressed
air travelling through the
Venturi Tube
Assembly
will pull a vacuum on the
cooling system to remove air from the
system.
4. Once the vacuum reading on the
Gauge
reaches approximately 25 on
the green scale, release the
Air Switch
.
Note that this also a good opportunity
to check for cooling system leaks,
Compressed Air
Supply Line
Air
Switch
Gauge
Coolant
Valve
(closed)
Coolant
Supply
Line
Venturi
Tube
Assembly
Removing the Air from the Cooling System with Cooling System Tool