Remove/install camshafts - AR05.20-P-6992MM

ENGINE 157, 278 in MODEL 216, 221 

ENGINE 276 in MODEL 221 

Fig 1: Identifying Camshafts Remove/Install Components

Courtesy of MERCEDES-BENZ USA

Shown on engine 278 

	Remove/Install
1	Remove respective chain tensioner	ENGINE 157, 278 in MODEL 216, 221	AR05.10-P-7800MMB
		ENGINE 276 in MODEL 221	AR05.10-P-7800MMA
2	Remove cylinder head cover	Engine 157, 278 - left cylinder head cover	AR01.20-P-5013MMB
		Engine 157, 278 - right cylinder head cover	AR01.20-P-5012MMB
		Engine 276 - left cylinder head cover	AR01.20-P-5013MMA
		Engine 276 - right cylinder head cover	AR01.20-P-5012MMA
3	Remove auxiliary bearing cap (3) and mount hold-down tool	Screw/bolt, auxiliary bearing cap to cylinder head	*BA05.20-P-1010-02A
		Tie-down set	Fig 2
4	Rotate engine at crankshaft center bolt in direction of engine rotation to top dead center (TDC) on cylinder 1 (ignition TDC)
5	Remove the hold-down tool	Tie-down set	Fig 2
6.1	Remove intake and exhaust camshaft (1A, 1E) on right cylinder head (01)	When removing the camshafts on RH cylinder head The exhaust camshaft (1A) on the right cylinder head (01) must be removed first. Markings on the camshafts (1A, 1E) must be aligned with the cylinder head flat surface. Oil compensating elements and camshaft bearing points.
6.2	Take out intake and exhaust camshaft (2A, 2E) at right cylinder head (01)	When removing the camshafts on LH cylinder head The intake camshaft (2E) must first be removed on the left cylinder head (01). Markings on the camshafts (2A, 2E) must be aligned with the cylinder head flat surface. Oil compensating elements and camshaft bearing points.
7	Remove camshaft positioner	When replacing the camshaft	AR05.20-P-7201MMB
8	Mark pulse wheel for camshafts	For missing color codings on the pulse wheels
			AR05.20-P-6292-04MM
		Template	Fig 3
	Check
9	Check basic position of the camshafts (1A, 1E, 2A, 2E)		AR05.20-P-6010MM
10	Install in the reverse order

Fig 2: Identifying Tie-Down Set (276 589 01 40 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Template (278 589 00 23 00)

Courtesy of MERCEDES-BENZ USA