Check Engine Cooling System Cap - Ar20.30-D-4301TSR

Engine 642 in model 907 

Engine 651 in model 907 

	Risk of injury  to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	Check
1	Remove the cap (1) from the coolant expansion reservoir.	Turn the cap (1) one half-turn counterclockwise, release the overpressure and then unscrew the cap (1).
2	Check the cap (1) for corrosion.	If corrosion is present, ↓ change the cap (1).
3	Attach the adapter (2) to the hose of the pressure pump (3).	Adapter	Fig 2
		Pressure pump	Fig 1
4	Fit the cap (1) on the adapter (2).	Adapter	Fig 2
5	Slowly apply test pressure to the cap (1) and establish opening pressure.	Build up the test pressure by max. 0.4 bar per second until the opening pressure is reached. The test pressure must decrease once the opening pressure has been reached. When the valve is open, an escape of air with only a small flow volume is discernible. The overpressure valve closes max. 0.35 bar after the opening pressure has been reached. Cap overpressure valve opens If specified values are not reached, ↓ change the cap (1).	*BE20.00-N-1002-02TS
6	Remove hose of pressure pump (3) from adapter (2)	Adapter	Fig 2
		Pressure pump	Fig 1
7	Remove the cap (1) from the adapter (2).	Adapter	Fig 2
8	Fit the cap (1) on the coolant expansion reservoir.

ENGINE COOLING SYSTEM

Number	Designation		Engine 642 in model 907
BE20.00-N-1002-02TS	Cap overpressure valve opens	bar	1,4

ENGINE COOLING SYSTEM

Number	Designation		Engine 651 in model 907
BE20.00-N-1002-02TS	Cap overpressure valve opens	bar	1,4

Fig 1: Pressure Pump (124 589 24 21 00)

Fig 2: Adapter (210 589 03 63 00)