Check cylinders for leaks - AR01.00-P-1300CD

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ENGINES 651 in MODELS 166, 172, 204, 207, 212, 218, 221

Fig 1: Checking Cylinders For Leaks

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	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
	Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure	Keep all ignition sources out of hazard area. Do not carry out any work on system when it is pressurized.	AS07.16-Z-0001-01A
1	Bring engine to operating temperature (approx. 80°C)	Only check compression pressure when engine is at normal operating temperature.
2	Switch off ignition	On vehicles with code (889) Keyless Go, press Start-Stop button repeatedly until the ignition is switched off.
3	Open engine hood	MODEL 166.0	AR88.40-P-1000GQ
		Model 172.4	AR88.40-P-1000V
		Model 204.3, 207, 212 Model 218, 221	AR88.40-P-1000EW
4	Remove cylinder head cover trim	Model 204 Model 166, 172, 212, 218, 221	AR01.20-P-5014-02CD
5	Remove fuel filter	Place to the side with lines still connected.
		Model 204	AP47.20-P-0780CWD
		Model 166, 172, 207, 212, 218	AP47.20-P-0780EWD
		Model 221	AP47.20-P-0780SXI
6	Remove ceramic glow plugs		AR15.20-P-4111CD
7.1	Position piston of the cylinder to be tested with a counter holder at top dead center (TDC)	Except code (B03) ECO start-stop function Rotate engine on vibration damper of the crankshaft. Do not turn engine against the direction of rotation of engine.
7.1		Counterholder	Figure
7.2	Position piston of the cylinder to be tested using a suitable tool at top dead center (TDC)	With code (B03) ECO start/stop function Rotate engine on vibration damper of the crankshaft. Do not turn engine against the direction of rotation of engine.
8	Connect cylinder leakage tester (1)	Calibrate cylinder leakage tester (1).	AR01.00-P-1300-01HB
		Intermediate piece	Figure
		Screw-in fitting Cylinder leakage tester (pressure loss)	Figure
	Checking
9	Charge cylinder with compressed air and read off pressure loss on cylinder leakage tester (1)	Cylinder leakage: permissible loss total indication	*BE01.00-P-1001-02Z
		Cylinder leakage: permissible losses at valves and cylinder head gasket	*BE01.00-P-1002-02Z
		Cylinder leakage: permissible losses at pistons and piston rings If the crankshaft turns, counterhold engine on the crankshaft vibration damper using an assistant.	*BE01.00-P-1003-02Z
		Counterholder	Figure
10	Conduct test for other cylinders in the firing order of the engine	Observe ignition sequence.	AR01.00-P-1300-03T
11	Install in the reverse order

CYLINDER LEAKAGE

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

Fig 2: Identifying Intermediate Piece (611 589 02 63 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Screw-In Fitting (642 589 00 63 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Counterholder (651 589 00 40 00)

Courtesy of MERCEDES-BENZ USA