Inspect cylinders for leaks - AR01.00-P-1300GZS (ML63 AMG)

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 156 in MODEL 164, 251

Fig 1: Inspecting Cylinders For Leaks (Engine 156)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	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
	Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by 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
1	Bring engine to operating temperature (approx. 80°C)	Only check cylinder for leaks when engine is at normal operating temperature.
2	Remove key from the ignition lock	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	Unscrew cap (1) for coolant expansion reservoir (2)
5	Remove the oil filler cap (3)
6	Remove partition wall between wheelhouses	Model 251	AR62.30-P-2400RT
7	Remove air filter housing		AR09.10-P-1150GZS
8	Remove ignition coils		AR15.12-P-2003GZS
9	Remove spark plugs		AR15.12-P-1010GZS
10	Position piston of cylinder to be checked at top dead center using top dead center selector	Crank engine at crankshaft center bolt in direction of rotation of engine.
		Socket	Figure
		Cylinder leakage testing unit	*WH58.30-Z-1015-05A
11	Connect cylinder leakage testing unit (04)		AR01.00-P-1300-01VA
		Cylinder leakage testing unit	*WH58.30-Z-1015-05A
	Checking
12	Pressurize cylinder with compressed air and read off the pressure loss on cylinder leakage testing unit (04)	Cylinder leaktightness permissible loss total indication	*BE01.00-P-1001-02Z
		Cylinder leaktightness permissible losses at valves and cylinder head gasket	*BE01.00-P-1002-02Z
		Cylinder leaktightness permissible losses at pistons and piston rings If the crankshaft rotates:↓	*BE01.00-P-1003-02Z
		Install retaining lock for crankshaft	AR03.30-P-5000GZS
13	Check the other cylinders in the firing order of the engine		AR01.00-P-1300-03SLR
14	Install in the reverse order

CYLINDER LEAKAGE

Number	Designation		All engines
BE01.00-P-1001-02Z	Cylinder leaktightness permissible loss total indication	%	≤25
BE01.00-P-1002-02Z	Cylinder leaktightness permissible losses at valves and cylinder head gasket	%	≤10
BE01.00-P-1003-02Z	Cylinder leaktightness permissible losses at pistons and piston rings	%	≤20

Fig 2: Identifying Wrench Socket (001 589 65 09 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1015-05A	Cylinder leakage testing unit