Inspecting cylinders with a light probe - AR01.00-P-0200CMG

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ENGINE 156 in MODEL 204, 212

Fig 1: Inspecting Cylinders With Light Probe

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death caused by contact with parts conducting high voltages.	Do not touch parts which conduct high voltages. Persons who wear electronic implants (e.g. heart pacemakers) should never perform any work on the ignition system	AS15.10-Z-0001-01A
	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
1	Remove spark plugs		AR15.12-P-1010CMG
2	Rotate engine at crankshaft center bolt in the engine's direction of rotation until piston of cylinder to be inspected is at bottom dead center		Fig 2
3	Connect cylinder inspection lamp (1) and insert the flexible endoscope (2) of the cylinder inspection lamp into the cylinder to be inspected through the threaded bore of the spark plug
	Checking
4	Check cylinder wall, piston crown and valves	If there is "scoring" (wear to the cylinder), the cylinder wall has become rough and the honing marks are no longer visible. In case of doubt, remove cylinder head.
	General information on inspecting cylinder walls		AH01.00-P-0300-01AMG
5	Check other cylinders in the same way
6	Install in the reverse order

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

Courtesy of MERCEDES-BENZ USA