Remove/Install Camshafts - AR05.20-P-6992MRA

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Engine 274.9 in model 205

Engine 274.9 in model 253

MODIFICATION NOTES

12.08.2019	Note AH00.00-P-0500-01MNE added.	Operation step 1
12.08.2019	Note AH05.20-P-1000-09SZ added.	Operation steps 3 and 4

Fig 1: Intake/Exhaust Camshafts Components Location - Engine 274.9 In Model 253

Courtesy of MERCEDES-BENZ USA

	Risk of injury caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
	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
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove/install
1	Remove camshaft positioners.		AR05.20-P-7201MRA
	Notes on application of flange sealants to seal major assemblies		AH00.00-P-0500-01MNE
2	Remove hold-down tools of the intake camshaft (2) and exhaust camshaft (1).	Bolt for camshaft hold-down tool	*BA05.20-P-1001-02K
3	Remove intake camshaft (2). General information on checking camshafts and bearing points of camshafts		AH05.20-P-1000-09SZ
	Specified engine oils (service) - Overview	: Wet compensating elements and camshaft bearing points with engine oil. Insert intake camshaft (2) so that the cams at cylinder 1 point upward at an angle. The cams of the intake camshaft (2) and exhaust camshaft (1) must point to each other. Otherwise the intake camshaft (2) or exhaust camshaft (1) will be damaged.	BB00.40-P-0223-02A
4	Remove exhaust camshaft (1). General information on checking camshafts and bearing points of camshafts		AH05.20-P-1000-09SZ
	Specified engine oils (service) - Overview	: Wet compensating elements, vacuum pump drive and camshaft bearing points with engine oil. Insert exhaust camshaft (1) so that the cams at cylinder 1 point upward at an angle. The cams of the intake camshaft (2) and exhaust camshaft (1) must point to each other. Otherwise the intake camshaft (2) or exhaust camshaft (1) will be damaged.	BB00.40-P-0223-02A
5	Check diameters of the camshaft bearing journals for wear.	Diameter of camshaft fitted bearing journal If the wear limit is reached, ↓ Replace intake camshaft (2) or exhaust camshaft (1).	*BE05.20-P-1002-03E
6	Install in the reverse order.

CHECK VALUES FOR CAMSHAFT BEARING

Number	Designation			Engine 274 except code A14 (Camtronic)	Engine 274 with code A14 (Camtronic)
BE05.20-P-1002-03E	Diameter of camshaft fitted bearing journal	Standard size	mm	31, 947...31, 963	31, 947...31, 963

CAMSHAFT, CAMSHAFT ADJUSTMENT

Number	Designation		Engine 274
BA05.20-P-1001-02K	Bolt for camshaft hold-down tool	Nm	28