Compression pressure test - AR01.00-P-1200HW

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 601 in MODEL 124, 201, 202

ENGINE 602 in MODEL 124, 201

ENGINE 603 in MODEL 124, 126, 140

Fig 1: Identifying Test For Compression Pressure - Engine 601 In Model 124, 201, 202

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing, installing
1	Warm engine up to operating temperature	Test compression pressure only when engine is at normal operating temperature
2	Remove injection nozzles (1)	Naturally aspirated engine	ra07016010230x
		Turbo engine	ra07016026810x
3.1	Remove windscreen washer fluid reservoir	Model 202
4	Connect vacuum pump (05) to stop unit and pressurize with approx. 400 mbar.	This prevents fuel being injected.	Fig 2
5	Crank engine several times with ignition/starter switch for cleaning. The transmission must be shifted into neutral for this step.
6	Screw compression recorder (01) with appropriate connector (03) and flexible connection piece (02) into the prechamber of the cylinder to be tested	Use connector on engines with oblique injection	Fig 5
			Fig 3
			Fig 4
7	Test compression pressure. Crank engine at least 9 revolutions with ignition/starter switch with transmission in neutral and vacuum pump connected.	Test compression pressure of the remaining cylinders in the same way	BE01.00-P-1001-01A BE01.00-P-1002-01A
8	Compare measurements obtained with the specified pressures.	If the pressure is below the minimum compression pressure at one or several cylinders, determine cause, inspect cylinders for leaks if necessary.	*BE01.00-P-1003-01A
		Inspecting cylinders for leaks	ra01006010015x

COMPRESSION PRESSURE

Number	Designation		Engine 601, 602 except 602.98, 603 with compression recorder 001 589 47 21 00	Engine 601, 602 except 602.98, 603 with compression recorder 001 589 78 21 00
BE01.00-P-1001-01A	Compression pressure installation tolerance or value when new	bar	26...32	29...35
BE01.00-P-1002-01A	Compression pressure wear limit or limit value	bar	≈ 18	≈ 18
BE01.00-P-1003-01A	Compression pressure permissible difference between individual cylinders	bar	≤3	≤3

Fig 2: Identifying Hand Vacuum Pump (001 589 73 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Adapter Line (124 589 36 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: Identifying Compression Recorder (001 589 76 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 5: Identifying Connector (602 589 00 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.