Test compression pressure

AR01.00-T-1200B

1.2.08

ENGINE 402.970, 441.980, 446.938

T01.00-0002-11

 	Remove/install
1	Open engine compartment flap
2	Set valve clearance
			AP05.30-T-0560B
3	Warm up engine to normal operating temperature	 Coolant temperature must be at least 80 °C.
Danger!	Risk of explosion caused by ignition of flammable products, risk of poisoning caused by inhaling fuel vapors or swallowing fuel as well as risk of injury to skin and eyes exposed to fuel.	No fire, sparks, open flames or smoking. Pour fuels only into suitable and appropriately marked containers. Wear protective clothing when handling fuel.	AS47.00-Z-0001-01A
4	Remove injector with nozzle holder		AR07.03-T-6840B
5	Connect compression recorder		AR01.10-T-0010-01B
			*BA07.03-N-1002-01A
			*000589642100
			*403589040700
		Use the puller for the injector of the first cylinder.	*442589000700
			*001589782100
			*403589002100
	Checking
6	Test compression pressure	Do the test with the injection pump fully switched off.  Turn the engine at cranking speed until the pointer rises no further.
			*BE01.00-N-1001-01C
			*BE01.00-N-1002-01C
7	Install in the reverse order

Test and adjustment values for compression pressure

Number	Designation		Engine 402.970	Engine 441.980	Engine 446.938


BE01.00-N-1001-01C	Wear limit or limit value	bar	20	20	20
BE01.00-N-1002-01C	Permissible difference between individual cylinders	bar	4	4	4

Injectors, injection valves, lines

Number	Designation		Engine 402.970	Engine 441.980	Engine 446.938


BA07.03-N-1002-01A	Thrust bolt, injection nozzle to cylinder head	Nm	70	70	70

403 589 04 07 00

Compression tester

Pronged wrench insert

Torque wrench

Connector

000 589 64 21 00

001 589 78 21 00

403 589 00 21 00

Puller

442 589 00 07 00