Cummins N14 STC, Celect, Celect Plus – Service Manual 008-049   Radiator Shutter Assembly

Check the shutterstats and the thermatic fan annually for cooling system temperature actuated systems.

Dual control systems are required for automatic radiator shutters and thermatic fans. Shutters must open and fans turned “ON” whenever the intake manifold air temperature rises above its sensor set point or whenever the engine coolant outlet temperature rises above its sensor set point. Either condition high coolant temperature or high intake manifold temperature must activate the shutters and/or fan.

If winterfronts or radiator covers are used, a minimum fixed opening of 3048 sq. mm [120 sq. in] (i.e., 254 x 305 mm [10 x 12 in], 127 x 610 mm [5 x 24 in], etc.) is required at all times.

Shutterstat and thermatic fan controls must operate in the same temperature range as the thermostat with which they are used.

Install a master temperature gauge which is known to be accurate into the thermostat housing. A thermocouple can be used.

Restrict the radiator air flow.

Operate the engine at maximum power.

When the coolant temperature reaches the temperature stamped on the control, check the shutters to see if they are open.

The shutters must be fully open.

Return the engine to idle, and remove the radiator air restriction.

When the coolant temperature drops to approximately 6°C [10°F] below the temperature stamped on the control, the shutters will be fully closed.

If the shutters do not operate correctly, refer to the OEM service manual.

Begin the intake air temperature actuation test with the engine cold (any stabilized coolant temperature at 60°C [140°F] or below).

Install the engine onto the engine or chassis dynamometer.

• Refer to Procedure 014-002 in Section 14.
• Refer to Procedure 014-005 in Section 14.

Install a Fluke™ digital thermometer, Part Number 3822666, and attach thermocouple wire kit, Part Number 3822988, into the intake manifold.

Run the engine at low idle until oil pressure reaches 69 kPa [10 psi] minimum.

Immediately load the engine to full power so that air temperature rises more quickly than the coolant temperature.

Observe air sensing shutterstat switch actuating shutters when the intake air reaches temperatures of 66°C to 99°C [150°F to 210°F].

If the air sensing shutterstat switch does not actuate the shutters when the intake air temperature reaches 99°C [210°F], the shutterstat sensor is damaged.

Air sensing shutterstat switch will not actuate the shutters until the intake manifold air temperature rises to 66°C to 99°C [150°F to 210°F] even though the sensing switch is labeled 66°C [150°F].

Return the engine to idle speed. The shutters will typically close when the intake manifold air temperature cools to 49°C to 66°C [120°F to 150°F].

If the shutters do not operate correctly, refer to the OEM service manual.