Testing compression pressure - AR01.00-P-1200GZS (ML63 AMG)

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ENGINE 156 in MODEL 164, 251

Fig 1: Testing Compression Pressure (Engine 156)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
1	Bring engine to operating temperature (approx. 80°C)	Test compression pressure only when engine is at normal operating temperature.
2	Turn key in ignition switch to position "0".	On vehicles with code 889, Keyless Go: Press keyless go start/stop button repeatedly until ignition is switched off Remove keyless go transmitter card or transmitter key from vehicle and store outside of transmission range (min. 2 m)
3	Open engine hood and raise to vertical position	Model 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT
4	Remove partition wall between wheelhouses	Model 251	AR62.30-P-2400RT
5	Remove air filter housing		AR09.10-P-1150GZS
6	Remove ignition coils		AR15.12-P-2003GZS
7	Remove spark plugs		AR15.12-P-1010GZS
8	Connect electrical supply lines for compression recorder (01)	The engine is not cranked by turning the key in ignition switch but by actuating compression recorder contact switch. Crank engine for about 5 seconds to remove combustion residue from cylinders.	AR01.10-P-0010-01GZ
		Compression recorder	Figure
		Electrical connection set	Figure
	Checking
9	Press compression recorder (01) on tapped bore of spark plug of first cylinder	The sealing cone of compression recorder (01) must tightly seal tapped bore of spark plug.
10	Crank engine with contact switch of compression recorder (01) until increase in pressure is no longer indicated on compression recorder
11	Carry out the testing procedure in the cylinder order on the remaining cylinders in the same way
12	Compare measurements obtained with specified pressures	Compression installation tolerance or new value	*BE01.00-P-1001-01B
		Compression pressure permissible difference between individual cylinders	*BE01.00-P-1002-01B
		Compression pressure wear limit or limit value If pressure indicated is less than the minimum compression pressure or if permissible difference between individual cylinders is exceeded:↓	*BE01.00-P-1003-01B
		Inspect cylinders for leaks	AR01.00-P-1300GZS
13	Install in the reverse order

COMPRESSION PRESSURE

Number	Designation		Engine 156
BE01.00-P-1001-01B	Compression installation tolerance or new value	bar	12 - 16
BE01.00-P-1002-01B	Compression pressure permissible difference between individual cylinders	bar	≤2.0
BE01.00-P-1003-01B	Compression pressure wear limit or limit value	bar	10

Fig 2: Identifying Compression Recorder (001 589 76 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Electrical Connection Kit (220 589 00 99 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.