Check coolant thermostat

AR20.10-G-2455NA

26.1.11

ENGINES 902.912 in MODEL 405.210 /230
for USA/Canada only

ENGINES 906.936 in MODEL 405.210 /230
for USA/Canada only

ENGINES 906.967 in MODEL 405.210 /230 with CODE (M03) Increased engine output,
for USA/Canada only

W20.10-1001-01

1 Coolant thermostat

1/1 Main valve

	Checking
 Danger!	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
1	Remove coolant thermostat (1)	Engine 906	AR20.10-G-2460NA
		Engine 902	AR20.10-G-2460NE
2	Suspend coolant thermostat (1) from a wire in a vessel filled with water
3	Heat water with a suitable source of heat, stir the water, so that the temperature of water is the same throughout	 Never use a welding torch or a soldering torch to heat the coolant thermostat (1); otherwise the coolant thermostat (1) will be damaged.
4	Measure temperature of water	 The heating-up rate should be not more than 1 to 2°C / minute from about 8°C below start of opening of the coolant thermostat (1). Pay attention to standard or tropical version of coolant thermostat (1).	*BE20.10-N-1001-02J
5	Heater water to the full opening temperature of the main valve (1/1), measure stroke	 Main valve (1/1) must be fully opened after 6 to 8 minutes. If the specifications are not achieved: 	*BE20.10-N-1002-02J
		replace coolant thermostat (1).
6	Install coolant thermostat (1)	Engine 906	AR20.10-G-2460NA
		Engine 902	AR20.10-G-2460NE

Check values for coolant thermostat

Number	Designation			Engine 902.912	Engine 906.936/967


BE20.10-N-1001-02J	Coolant thermostat start of opening		°C	83 (2)	83 (2)
BE20.10-N-1002-02J	Coolant thermostat main valve	Full opening	°C	95	95
		Stroke	mm	8	8