Testing compression pressure - AR01.00-P-1200B

ENGINE 112 

Air filter positioned at vehicle side. 

ENGINE 113 

Air filter positioned at vehicle side. 

Fig 1: Identifying Compression Recorder Assembly

	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 running engine	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	AS00.00-Z-0005-01A
1	Bring engine to operating temperature (approx. 80°C)	Only test compression when engine is at operating temperature.
2	Remove engine trim panel
3	Remove air filter housing
4	Remove resonance pipe with resonance body	All except model 163 with engine 113.942/981. Disconnect plug connection for hot film mass air flow sensor (HFM-SFI) for this step and unbolt resonance pipe at cylinder head cover. The resonance pipe is attached to the rear of the intake manifold with a plastic bracket. Do not damage plastic plate.	AR07.07-P-1454A
5	Remove spark plugs	Remove only one spark plug at each cylinder: ↓
		Models 210, 208, 202 with engine 112 Model 210 with engine 113	AP15.10-P-1580A
		Model 163 with engines 112, 113	AP15.10-P-1580GH
6	Crank engine with starter.	Do not crank engine at steering lock but use contact switch of the compression recorder. Crank engine several times with the starter in order to eliminate combustion residues in the cylinder.	AR01.10-P-0110V
	Checking
7	Insert compression tester into spark plug bore		Fig 2
8	Open throttle valve
9	Crank engine with starter	Do not crank engine at steering lock but use contact switch of the compression recorder. To check the compression pressure, crank the engine by at least 8 revolutions.	AR01.10-P-0110V
10	Carry out test procedure at the remaining cylinders in the same way
11	Compare measurements obtained with the specified pressures		*BE01.00-P-1001-01D  *BE01.00-P-1002-01D  *BE01.00-P-1003-01D
		If necessary, if the pressure is below the minimum compression pressure or if permissible difference between individual cylinders is exceeded:↓
		Inspect cylinders for leaks	AR01.00-P-1300HV
12	Install in the reverse order

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