Remove/install primary drive timing chain - AR05.10-P-7612ELB

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ENGINE 157, 278 in MODEL 212, 218

ENGINE 278 in MODEL 207

Fig 1: Primary Drive Timing Chain Remove/Install Components (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Primary Drive Timing Chain Remove/Install Components (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Primary Drive Timing Chain Remove/Install Components (3 Of 3)

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove cylinder head covers	Right cylinder head cover	AR01.20-P-5012ELB
		Left cylinder head cover	AR01.20-P-5013ELB
		Before assembly of the cylinder head covers the timing of the engine must be checked and corrected if necessary.
2	Remove timing case cover	The timing of the engine must be checked and corrected if necessary before assembly of the timing case cover.	AR01.40-P-8000ELB
3.1	Remove camshafts	For missing color codings on the segmented discs (1AL, 1AR, 1EL, 1ER).
	ENGINE 278 in MODEL 207		AR05.20-P-6992FH
		ENGINE 157, 278 in MODEL 212, 218	AR05.20-P-6992EL
3.2	Remove the right exhaust camshafts adjuster (8AR) and left intake camshafts adjuster (8EL)	For color codings present on the segmented discs (1AL, 1AR, 1EL, 1ER).
	ENGINE 278 in MODEL 207		AR05.20-P-7201FH
		ENGINE 157, 278 in MODEL 212, 218	AR05.20-P-7201EL
4	Mark segmented discs (1AL, 1AR, 1EL, 1ER) for camshafts relative to the cylinder head contact surface (01) in color (see arrows in picture)	For missing color codings on the segmented discs (1AL, 1AR, 1EL, 1ER).	AR05.20-P-6292-04MM
		Template	Figure
5	Remove oil pump	ENGINE 278 in MODEL 207	AR18.10-P-6020FH
		ENGINE 157, 278 in MODEL 212, 218	AR18.10-P-6020EL
6	Remove chain tensioner for primary chain drive timing chain (6)	Replace chain tensioner for primary chain drive timing chain (6).
		Screw/bolt, chain tensioner to cylinder crankcase/cylinder head	*BA05.10-P-1001-01R
7.1	Remove both cylinder heads	For replacing the primary chain drive timing chain (6) and secondary chains (05L, 05R) with slide and tensioning rails. Left cylinder head	AR01.30-P-5770ELB
		Right cylinder head	AR01.30-P-5780ELB
7.2	Disconnect left secondary chain (05L) and right secondary chain (05R)	For replacing the left and right secondary chain (05L, 05R) without slide and tensioning rails.
	ENGINE 278 in MODEL 207		AR05.10-P-7601FH
		ENGINE 157, 278 in MODEL 212, 218 For a timing chain stretch the left and right secondary chain (05L, 05R) and the primary chain drive timing chain (6) should be replaced.	AR05.10-P-7601EL
8	Remove right secondary chain (05R) from intermediate gear (7)
9	Remove screw/bolt for intermediate gear (7) on cylinder crankcase	The screw/bolt must be replaced after every disassembly.
		Screw/bolt, journal for intermediate gear to cylinder crankcase	*BA05.10-P-1004-01R
10	Remove the intermediate gear (7) together with the crankshaft gear, primary chain drive timing chain (6) and left secondary chain (05L)	The primary chain drive timing chain (6) must be mounted in such a way that the primary chain marking (3) and the punch mark (4M) on the intermediate gear (7) and crankshaft gear match. Engine damage will occur otherwise. A new primary chain drive timing chain (6) and secondary chain (05L, 05R) are delivered optionally with color codings or copper links. Replace intermediate gear (7) with journal. The intermediate gear must be mounted together with the primary chain drive timing chain (6) and the left secondary chain (05L).
11	Install in the reverse order
	Check
12	Check basic position of camshafts	ENGINE 278 in MODEL 207	AR05.20-P-6010FHA
		ENGINE 157, 278 in MODEL 212, 218	AR05.20-P-6010EL
		The timings of the engine must be checked and corrected if necessary before assembly of the cylinder head covers and the timing case cover.
	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
13	Perform an engine test run; in doing so check engine for proper operation and leaktightness

TIMING CHAIN, CHAIN TENSIONER

Number	Designation		ENGINE 157	ENGINE 278
BA05.10-P-1001-01R	Screw/bolt, chain tensioner to cylinder crankcase/cylinder head	Nm	9	9

TIMING CHAIN, CHAIN TENSIONER

Number	Designation			ENGINE 157	ENGINE 278
BA05.10-P-1004-01R	Screw/bolt, journal for intermediate gear to cylinder crankcase	M10	Nm	55	55

Fig 4: Identifying Template (278 589 00 23 00)

Courtesy of MERCEDES-BENZ USA