POWER SYSTEM
TB20J Plus Maintenance Manual 83
© Feb. 2023
the upper mark and lower mark.
4. If necessary, fill with correct coolant according to the
Oil Requirements , and do not overfill the tank.
Empty the Cooling System
Fig 38
1. After the engine and radiator have cooled suffi-
ciently (to the temperature below 50°C/122°F),
carefully remove the radiator cap.
2. Place an appropriate container under the discharge
outlet.
3. Remove the drain plug at the bottom of the radiator.
4. Drain the engine coolant.
5. Install the drain plug.
Fill with Coolant
1. After the engine and radiator have cooled suffi-
ciently (to the temperature below 50°C/122°F),
carefully remove the pressure cap on the radiator.
2. Fill with correct coolant to the maximum mark level
according to the Oil Requirements .
3. Reinstall the pressure cap.
4. Run the engine to operating temperature.
5. Turn off the engine.
6. Check the coolant level in the cooled engine.
Intake System
Check the Intake Pipe
Visually inspect the intake pipe daily for signs of wear,
damaged pipelines or loose clamps that could damage
the engine. If necessary, replace the damaged pipe and
tighten the loose clamp to ensure that the air system
does not leak.
Check the clamp and hose of the intake pipe for corro-
sion, which may allow the corrosive and dirt to enter the
air intake system. If necessary, disassemble and clean
the system.
Check the Resistance of Air Filter
Mechanical resistance indicator
Fig 39
Note: Do not remove the felt washer of the indicator.
The felt washer is used to absorb moisture.
The mechanical resistance indicator indicates if the re-
sistance for air to go through the dry air filter is too high.
The indicator can be mounted on the air filter outlet or
the dashboard. As dirt accumulates in the filter element,
the red mark (1) in the window will gradually rise. After
replacing the filter element, press the reset button (2) to
reset the indicator.
Vacuum indicator
Fig 40
The resistance or vacuum indicator should be installed
as close as possible to the turbocharger inlet to obtain
actual resistance. When the air resistance is too high,
the vacuum switch will activate the alarm indicator on
the dashboard.
Mechanical indicator for industrial gas
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