Testing coolant thermostat - AR20.10-P-2455AV

ENGINE 112 

ENGINE 112.945 in MODELS 463.209 /232 /233 /244 /245 /250 

ENGINE 113.962 in MODELS 463.206 /240 /241 /247 /248 /249 /254 

ENGINE 113.982 in MODELS 463.243 /246 

ENGINE 113 (except 113.995) in MODELS 129, 163, 202, 203, 208, 209, 210, 211, 215, 220, 230 

Fig 1: Coolant Thermostat Test

	Remove/install
	Risk of injury  to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
1	Remove coolant thermostat (1)	Installation:  Install new sealing ring. The coolant thermostat (1) must not be removed from housing. Otherwise it will be destroyed. The housing is supplied together with a coolant thermostat (1) for repair purposes.
		Engine 112 in models 170, 203, 211.080/280 /082/282/261/265, Engine 113 in models 211.083/283/270, 215.373/375
		Engine 112 in models 211.061/065, 220, 129, 209.361/461, 163, 202, 208, 209.365/465, 210, Engine 112.945 in models 463.245/233/209 /250/244/232, Engine 113 in models 209, 210, 129, 208, 211.070, 220, 230.475, 163, 202, Engine 113.962 in models 463.254/206/248 /240/247/241/249, Engine 113.982 in models 463.246/243	AR20.10-P-2460B
		Engine 113.990 in models 211.076/276, Engine 113.991 in models 215.374, 220.074, Engine 113.992 in model 230.474	AR20.10-P-2460RVK
		Engine 112.973 in model 230.467	AR20.10-P-2460R
	Checking
2	Heat coolant thermostat (1)	Suspend coolant thermostat (1) from a wire in a vessel filled with water and heat water. For heating up under no circumstance use a welding torch or a soldering torch, otherwise sudden heat penetration modifies the metal structure!
3	Measure temperature of water	The heating-up rate should be not more than 1°C to 2°C/minute from about 8°C below start of opening of coolant thermostat (1).
			*WH58.30-Z-1002-08A
4	Warm up water to full opening temperature of valve (2) and then measure hub of valve (2)	If the check values are not achieved, replace coolant thermostat (1). Check values for engine 113.969:
		Start of opening Minimum stroke Check values engine 112, 113 except 113.969:
		Start of opening	*BE20.10-P-1001-02A
		Minimum stroke	*BE20.10-P-1002-02A
5	Install in the reverse order
6	Inspect cooling system for leaks
		Engine 112.946 in model 209.764
		Engine 112 (except 112.961/946/953/947 /960/916/955/912), Engine 113 (except 113.992/987/968/991 /990/963)	AR20.00-P-1010HA
		Engine 113.963/990/991/992	AR20.00-P-1010RVK
		Engine 112.912/916/947/953/955/960/961, Engine 112.946 except in model 209.764, Engine 113.968/987	AR20.00-P-1010P