Timing chain replacement: Mercedes-Benz eng. 113 (113.940, 113.941, 113.942, 113.943, …)

🧭 Before you start

Fits: platform codes 43, AMG, -T, |, 430, 4MATIC, -L, CABRIOLET, 500, 55, EVO, KOMPRESSOR

• Opens: coolant, fuel
• Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

• Always renew the timing chain
• Mark the timing chain and camshaft gearwheels to each other with paint
• The paint on the camshaft gearwheel and chain must be aligned
• Do not turn the engine anti-clockwise

🔧 Engine codes this applies to

📐 43 workshop diagrams for 113.940

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

Preparation and removal

1. Always renew the timing chain
2. Disconnect the battery earth cable
3. Connect the old chain to the new one
4. Turn the engine until the chain connecting link shows
5. Chain tensioner

6. Locating bush
7. Disconnect the mass airflow meter
8. Mark the timing chain and camshaft gearwheels to each other with paint
9. Remove the air ducts, left and right
10. Remove the crankcase breather hose from the air filter housing
11. Remove the air filter
12. Remove the ignition coils
13. Disconnect the spark plug cables
14. Remove the spark plugs
15. Vehicles with automatic transmission
16. Remove the automatic transmission dipstick tube
17. Vehicles with non-flexible fuel line:
18. Disconnect the fuel lines from the fuel rail
19. Disconnect the vacuum hose from the valve cover
20. Disconnect the crankcase breather hose from the valve cover
21. Stage 1:
22. Right cylinder head:
23. Disconnect the vacuum hose from the valve cover
24. Note: Do not turn the engine anti-clockwise
25. Remove the cooling fan
26. If necessary
27. Drain the coolant
28. Remove the camshaft gearwheels
29. Remove the cooling fan shroud
30. Turn the camshafts until the locking tools fit
31. Remove the combination valve
32. All vehicles:
33. Position the crankshaft to 40° after TDC
34. Right cylinder head:
35. Use the special tools
36. Remove the drive belt
37. Stage 1:
38. Stage 2:
39. Remove the drive belt idler pulley
40. Remove the bolts in the reverse order to that shown
41. Separate the timing chain
42. Use the special tools to remove the timing chain pins
43. Remove the special tools

Installation and checks

44. Fit the timing chain onto the camshaft gearwheel
45. The paint on the camshaft gearwheel and chain must be aligned
46. Fit the timing chain and camshaft gearwheel together
47. Fit the timing chain and camshaft gearwheel together
48. Remove the camshaft locking tools
49. Remove the camshaft locking tools
50. Remove the locating bush from the camshaft
51. Refit the camshaft bearing bridge
52. Renew the bolt(s)
53. Tighten the bolts
54. Fit the locating bush onto the camshaft
55. Secure the chain
56. Refit the Hall sensor(s)
57. Renew the seal
58. Fit the chain tensioner
59. Fit the idler pulley
60. Fit the drive belt
61. Refit the radiator fan and shroud
62. If necessary
63. Fit the coolant hoses
64. Refill the cooling system
65. Vehicles with air pump:
66. Renew the gasket
67. Refit the combination valve
68. All vehicles:
69. Right cylinder head:
70. Refit the cylinder head cover
71. Renew the gasket
72. Tighten the bolts
73. Check the gasket position
74. Reconnect the vacuum hose
75. Left cylinder head:
76. Refit the cylinder head cover
77. Renew the gasket
78. Tighten the bolts
79. Check the gasket position
80. Reconnect the crankcase breather hose
81. Reconnect the vacuum hose
82. Vehicles with automatic transmission
83. Refit the automatic transmission dipstick tube
84. Vehicles with non-flexible fuel line:
85. Reconnect the fuel line
86. All vehicles:
87. Refit the spark plugs
88. Refit the spark plug cables
89. Refit the ignition coil(s)
90. Vehicles with air filter fitted on the body
91. Refit the air filter housing
92. Refit the resonance duct
93. Reconnect the mass airflow meter
94. Refit the resonator
95. Vehicles with air filter fitted on the engine
96. Refit the air filter
97. Refit the left and right suction fan ducts
98. Refit the crankcase breather hose
99. All vehicles:
100. Refit the engine upper cover(s)
101. Reconnect the battery earth cable

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