Inspect cylinders for leaks - AR01.00-P-1300GZA (ML350, ML550, GL450, GL550)

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 272, 273 in MODEL 164, 251

Fig 1: Inspecting Cylinders For Leaks (Engine 272, 273)

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
1	Bring engine to operating temperature (approx. 80°C)	Only check cylinder for leaks when the engine is at normal operating temperature.
2	Remove key from the ignition lock	Vehicles with Keyless Go, code 889: Press Keyless Go start/stop button repeatedly until ignition is switched off. Remove the Keyless Go transmitter card or transmitter key from vehicle and store beyond reach of the transmitter (at least 2 m).
	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
3	Unscrew cap (1) from coolant expansion reservoir (2)
4	Remove the oil filler cap (3)
5	Remove air filter housing		AR09.10-P-1150GZA
6	Remove ignition coils		AR15.12-P-2003GZA
7	Remove spark plugs		*BA15.10-P-1001-01C
8	Position piston of cylinder to be checked at top dead center with the top dead center selector	Crank engine at crankshaft center bolt in direction of rotation of engine.
		Cylinder leakage tester, see GOTIS http://gotis.aftersales.daimlerchrysler.com	Figure
9	Connect cylinder leakage testing unit (04)		AR01.00-P-1300-01VA
	Checking
10	Pressurize cylinder with compressed air and read off 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-5000GZA
11	Check other cylinders in firing order of the engine	Firing order	AR01.00-P-1300-03HA
12	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

SPARK PLUGS

Number	Designation		Engine 272	Engine 273
BA15.10-P-1001-01C	Spark plug on cylinder head	Nm	23	23

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

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.