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

Engine 256.9 in model 213, 238, 257, 290

Courtesy of MERCEDES-BENZ USA

	Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil	Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers.	AS18.00-Z-0001-01A
Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove/install
1	Remove Hall sensor of the exhaust camshaft.		AR15.12-P-2147MSA
2	Remove Hall sensor of the intake camshaft.		AR15.12-P-2146MSA
3	Turn engine in the direction of engine rotation to cylinder 1 ignition TDC and install retaining lock of the crankshaft.	If the marking (M) is not visible, the piston of cylinder 1 is not at ignition TDC.	AR03.30-P-5001MSA
4	Remove engine air intake duct downstream of air filter.		AR09.10-P-8130MSA
5	Remove front noise insulation.
6	Remove wide open throttle bleed line from oil separator.		AR01.20-P-9750MSA
7	Remove rear noise insulation.
8	Remove screws (60a).	When loosening and tightening the screws (60a), do not damage the fuel high-pressure line. Leaks can occur otherwise. Screw, service cover to camshaft housing	*BA05.20-P-1003-04MRT
9	Loosen screw (60b).	When loosening and tightening the screw (60b), do not damage the fuel high-pressure line. Leaks can occur otherwise.
		Screw, service cover to camshaft housing	*BA05.20-P-1003-04MRT
		Box wrench bit	Fig 3
		Engine mount wrench set	Fig 2
10	Remove service covers (61).	Ensure seal is correctly installed. The seals will otherwise be damaged. Replace seals.
	Check
11	Install locating tool in the service openings to check the basic position of the camshafts.	The locating tool must be inserted in the service openings in a disassembled manner.
		Locating tool If locating tool can not be inserted: ↓ Set basic position of the camshafts.	Fig 1
			AR05.20-P-6020MSA
12	Install in the reverse order.