Check Basic Position Of Camshafts - AR05.20-P-6010MRA

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Engine 274.9 in model 205

Engine 274.9 in model 253

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove both Hall sensors on camshafts		AR15.10-P-2000MRA
2	Remove engine air intake duct upstream of air filter
3	Rotate engine at crankshaft center bolt in direction of engine rotation to top dead center (ignition TDC) on cylinder 1	The TDC marking on belt pulley/vibration damper must be aligned with positioning edge on timing case cover. Socket wrench bit	Fig 1
	Check
4	Check basic position of camshafts	The basic position of the camshafts is checked by a visual inspection over the Hall sensor openings on cylinder head cover (3). To check the exhaust camshaft adjustment the edge (1a) of the partial segment of the segment disc (1) must be visible in the middle in the Hall sensor opening (picture). To check the intake camshaft adjustment the bearing slot (2a) of the segment disc (2) must stand in the middle in the Hall sensor opening (picture). If the basic position is not correct ↓ Set basic position of camshafts.	AR05.20-P-6020MRA
5	Install in the reverse order

Fig 1: Identifying Socket Wrench Bit (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA