Timing chain replacement: Mercedes-Benz 272.9 W219 (272.943, 272.964)

🧭 Before you start

Fits: platform codes 280, |, 300, 350

• Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

• Always renew the timing chain
• The crankshaft pulley mark will be 305°
• The pulse wheel markings must be centered in the sensor location holes
• The chain tensioner must be removed before the inlet camshaft adjuster can be tightened
• Do not drop any timing chain pins into the crankcase

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Always renew the timing chain
2. Always use new gaskets
3. Renew the chain tensioner
4. Ignition coil
5. Turn the engine until the chain connecting link shows

6. Cylinder head cover
7. Remove the battery cover
8. Hall sensor
9. Use the special tool alignment pins
10. Until the special tool alignment pins can be removed
11. Timing chain assembly tools:
12. Remove the air filter housing
13. Timing chain separating tool:
14. Turn the crankshaft to 55° BTDC for cylinder 1
15. Note: The crankshaft pulley mark will be 305°
16. Disconnect the hoses
17. Remove the air shut-off valve
18. The pulse wheel markings must be centered in the sensor location holes
19. Correct if necessary
20. Turn the crankshaft to 40° ATDC for cylinder 1
21. Remove the Hall sensors
22. Use a pry bar at the points shown
23. Disconnect the oil breather pipe
24. Remove the centrifuge
25. Note: Use a punch
26. Remove the tensioner bolt(s)
27. Remove the control unit bracket
28. Disconnect the earth cable from the cylinder head
29. Remove the cylinder head cover
30. Remove the exhaust camshaft timing adjuster
31. While counterholding the exhaust camshaft
32. Remove the camshaft bearing caps
33. Remove the chain tensioner
34. Check the position of the camshafts
35. Remove the inlet camshaft timing adjuster
36. Remove the inlet camshaft
37. Note: Cover the timing chain housing with a clean cloth
38. Fit the special tool
39. Use the special tools to remove the timing chain pins
40. Separate the timing chain
41. Note: Do not drop any timing chain pins into the crankcase
42. Pull the removed timing chain pins out of the chain separating tool

Installation and checks

43. Use a timing chain assembly link
44. Remove the special tool
45. Connect the ends of the new chain
46. Turn the rivet tool until resistance is felt
47. Timing chain assembly tool:
48. Tighten the special tool
49. Timing chain assembly tool:
50. Remove the special tools
51. Refit the inlet camshaft
52. Refit the inlet camshaft timing adjuster
53. Lubricate the contact surfaces before assembling
54. Fit the camshaft pulse wheel
55. Note: Finger-tight only
56. Lubricate the contact surfaces before assembling
57. Refit the chain tensioner rail(s)
58. Refit the chain tensioner rail bolt
59. Turn the crankshaft to 40° ATDC for cylinder 1
60. Tighten the inlet camshaft gearwheel
61. Note: The chain tensioner must be removed before the inlet camshaft adjuster can be tightened
62. Type 1:
63. Fit the chain tensioner
64. With the detent spring
65. Refit the tensioner bolt
66. With the detent spring
67. Refit as shown
68. So the detent spring locks into the first notch
69. Tighten the tensioner body
70. Renew the seal
71. In the reverse order of installation
72. This will unlock the new tensioner
73. Note: Check the colour coding for the inlet camshaft timing chain
74. Note: This will tension the new hydraulic tensioner
75. Type 1:
76. Remove the counterhold tool
77. Turn the crankshaft to 40° ATDC for cylinder 1
78. Type 2:
79. Refit the camshaft bearing caps
80. Refit the exhaust camshaft timing adjuster
81. Fit the camshaft pulse wheel
82. Check the dowel pin(s) for damage
83. Clean off the old sealant
84. Tightening sequence:
85. Tighten the camshaft gearwheel
86. When tightening, always use the tool to counterhold
87. Remove the punch used to lock the camshaft backlash adjuster
88. Refit the centrifuge
89. Note: Left-hand thread
90. Refit the centrifuge cover
91. Refit the oil breather pipe
92. Refit the cylinder head front cover
93. Note: When removing/fitting the covers, do not damage the fitted sleeves
94. Apply sealant as indicated
95. Note: The bead thickness must be 1.0 ± 0.5 mm
96. Within 10 minutes
97. Turn the crankshaft to 55° BTDC for cylinder 1
98. Note: The crankshaft pulley mark will be 305°
99. Check the position of the camshafts
100. To both camshafts
101. To both sides
102. The pulse wheel markings must be centered in the sensor location holes
103. Correct if necessary
104. Refit the control unit and bracket
105. Refit the cable guide
106. Refit the alternator
107. Right cylinder head:
108. Refit the Hall sensor(s)
109. Refit the air shut-off valve
110. Refit the air pump switch-over valve
111. Check that all the wiring and hoses are reconnected
112. Refit the right-hand air duct
113. Refit the spark plugs
114. Refit and connect the ignition coils
115. Refit the air filter housing(s)
116. Lubricate the mounting rubbers
117. Check for correct fitting
118. Refit the air inlet tube(s)
119. Reconnect the battery earth cable
120. Refit the battery cover
121. Check for any fault codes
122. Delete all the fault codes
123. If required;
124. Reactivate the backup battery for the emergency call system

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