Check compression pressure · ar0100p1201mrt · Mercedes-Benz WIS

AR01.00-P-1201MRT

Check compression pressure

04.06.2018

Engine

256.9 in model 222

 Warning	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
 Warning	Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove
1	Warm up engine to normal operating temperature.	 Only check compression pressure on an engine that is at operating temperature.
2	Remove spark plugs.
			AP15.10-P-1580E
3	Crank engine.		AR01.10-P-0110MRT
		 This process serves to remove combustion residue from the cylinders.
4	Screw adapter into spark plug threaded bore of the cylinder to be checked.	 Adapter	*256589019100
5	Connect compression recorder to the thread adapter.	 Compression tester	*001589762100
	Check
6	Crank engine.		AR01.10-P-0110MRT
		 Aid of helper required.
7	Carry out test procedure on further cylinders in the same way.
8	Compare measurement values with permissible values.	Installation tolerance or new value of compression pressure	*BE01.00-P-1001-01B
		Compression pressure, permissible difference between the cylinders	*BE01.00-P-1002-01B
		Wear limit or limit value of compression pressure	*BE01.00-P-1003-01B
		If the minimum compression pressure is not reached or if the permissible difference between the individual cylinders is exceeded,
		
		Check cylinder leakage.
			AR01.00-P-1300MRT
	Install
9	Disconnect compression recorder from adapter.	 Compression tester	*001589762100
10	Unscrew adapter.	 Adapter	*256589019100
11	Install spark plugs.
			AP15.10-P-1580E

Compression pressure

Number	Designation		Engine 256
BE01.00-P-1001-01B	Installation tolerance or new value of compression pressure	bar	10...15

Compression pressure

Number	Designation		Engine 256
BE01.00-P-1002-01B	Compression pressure, permissible difference between the cylinders	bar	3

Compression pressure

Number	Designation		Engine 256
BE01.00-P-1003-01B	Wear limit or limit value of compression pressure	bar	8,5

256 589 01 91 00

Adapter

001 589 76 21 00

Compression tester

Referenced documents

ah0000p500001a Notes on avoiding damage through contamination and foreign objects
ap1510p1580e Replace spark plugs
ar0100p1300mrt Check cylinders for leaks
ar0110p0110mrt Crank engine with starter
as0000z000201a Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.
as0000z000501a Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.