M272 (272.985) in W211,W219 — MERCEDES-BENZ

🧭 Before you start

Fits: platform codes 350, CGI, -T, |

• Opens: fuel
• Timing position: the crankshaft or camshaft is set and locked during this job
• Renewed: component note, chain tensioner note

Don't miss

• Do not disconnect the hoses
• When removing/fitting the covers, do not damage the fitted sleeves
• When loosening, always use the tool to counterhold
• Always renew the component
• The bead thickness must be 1.0 ± 0.2 mm

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Timing chain separating tool:
2. Before disconnecting the battery cable, check the audio system security code
3. When loosening, always use the tool to counterhold
4. Connect the old chain to the new one
5. Use a timing chain assembly link

6. Remove the cloth
7. All vehicles:
8. Remove the transmitter key from the control unit
9. Timing chain layout
10. Vehicles with keyless entry system:
11. Remove the keyless start card from the vehicle and keep it outside the transmitter range
12. Stud bolt:
13. Deactivate the backup battery for the emergency call system
14. All vehicles:
15. Disconnect the battery earth cable
16. Remove the engine upper cover
17. Remove the air inlet tube(s)
18. Loosen the clamp(s)
19. Remove the air filter housing
20. Disconnect the hose
21. Remove the ignition coils
22. Remove the ignition leads
23. Turn the rivet tool until resistance is felt
24. Remove the bolts
25. Move aside
26. Note: Do not disconnect the hoses
27. Disconnect the connectors
28. Turn the crankshaft to 55° BTDC for cylinder 1
29. Remove the Hall sensors
30. Remove the cylinder head front cover
31. Use a pry bar at the points shown
32. Note: When removing/fitting the covers, do not damage the fitted sleeves
33. Left-hand bank:
34. Disconnect the oil breather pipe
35. Remove the centrifuge cover
36. Remove the centrifuge
37. Note: Left-hand thread
38. Turn the crankshaft to 40° ATDC for cylinder 1
39. Check the position of the camshafts
40. Remove the ancillary drive belt
41. Remove the engine lower covers
42. Remove the alternator
43. Remove the chain tensioner
44. Right cylinder head:
45. Lock the camshaft backlash adjuster
46. Note: Use a punch
47. Punch diameter:
48. Loosen the camshaft gearwheel (exhaust)
49. Note: Do not remove
50. From the rear of the cylinder head
51. Torx:
52. Remove the camshaft pulse wheel
53. Check the dowel pin(s) for damage
54. Remove the exhaust camshaft timing adjuster
55. While counterholding the exhaust camshaft
56. Disconnect the right-hand connector from the control unit (viewed from the rear of the engine)
57. Note: Do not disconnect
58. Disconnect the control unit with the wiring and place it on the engine
59. Remove the control unit bracket
60. Disconnect the earth cable from the cylinder head
61. Disconnect the fuel line
62. Note: Clean off the area first
63. Use the special tools
64. Remove the fuel rail together with the injectors
65. Remove the fuel lines from the high-pressure fuel pump
66. Note: The fuel lines must be renewed
67. Remove the high-pressure pump
68. Plug the fuel line connections on the fuel pump
69. From the rear of the cylinder head
70. Disconnect the fuel distributor bracket from the cylinder head cover
71. Remove the cylinder head cover
72. Remove the chain tensioner rail(s)
73. Pull it upwards
74. Remove the camshaft pulse wheel
75. Check the dowel pin(s) for damage
76. Remove the timing chain from the camshaft gearwheel
77. Remove the inlet camshaft timing adjuster
78. Remove the camshaft bearing caps
79. Remove the exhaust camshaft
80. Remove the inlet camshaft
81. Fit the special tool
82. Use the special tools to remove the timing chain pins
83. Note: Cover the timing chain housing with a clean cloth
84. Fit the tool as shown
85. Separate the timing chain
86. Note: Do not drop any timing chain pins into the crankcase
87. Pull the removed timing chain pins out of the chain separating tool

Installation and checks

88. Remove the special tools
89. Note: While storing, protect from damage
90. Turn the crankshaft to 40° ATDC for cylinder 1
91. Refit the inlet camshaft
92. Refit the camshaft bearing caps
93. Refit the inlet camshaft timing adjuster
94. Lubricate the contact surfaces before assembling
95. Align the locating pins shown
96. Note: Always renew the component
97. Fit the camshaft pulse wheel
98. Note: Always renew the component
99. Note: Finger-tight only
100. Lubricate the contact surfaces before assembling
101. Align the locating pins shown
102. Refit the chain tensioner rail(s)
103. Refit the chain tensioner rail bolt
104. Note: Apply sealant to the bolts
105. Fit the exhaust camshaft
106. Refit the camshaft bearing caps
107. Refit the exhaust camshaft timing adjuster
108. Check the position of the camshafts
109. Fit the camshaft pulse wheel
110. Note: Always renew the component
111. Refit the nuts
112. Tighten the nuts by hand
113. To both camshafts
114. Lubricate the contact surfaces before assembling
115. Refit the cylinder head cover
116. Clean off the old sealant
117. Apply sealant as indicated
118. Within 10 minutes
119. Note: The bead thickness must be 1.0 ± 0.2 mm
120. Tightening sequence:
121. Tighten the camshaft gearwheel
122. When tightening, always use the tool to counterhold
123. Note: The chain tensioner must be removed before the camshafts can be tightened
124. Remove the punch used to lock the camshaft backlash adjuster
125. Remove the camshaft cap seal
126. Right-hand bank
127. Renew the chain tensioner
128. Note: Always renew the component
129. Apply a torque of 70 Nm to the crankshaft centre bolt
130. Note: In an anti-clockwise direction
131. While counterholding the exhaust camshaft
132. Left-hand bank:
133. This will unlock the new tensioner
134. Turn the crankshaft 90° in the direction of rotation
135. Note: This will tension the new hydraulic tensioner
136. Refit the cylinder head front cover
137. Note: When removing/fitting the covers, do not damage the fitted sleeves
138. Note: The bead thickness must be 1.0 ± 0.5 mm
139. Apply sealant as indicated
140. Reconnect the fuel distributor bracket to the cylinder head cover
141. Note: Do not tighten the fuel lines until all the attached components are securely fitted
142. Refit the centrifuge
143. Note: Left-hand thread
144. Refit the centrifuge cover
145. Refit the oil breather pipe
146. Refit the fuel lines to the high-pressure fuel pump
147. Note: The fuel lines must be renewed
148. Note: Finger-tight only
149. Refit the high-pressure pump
150. Renew the seals

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