Timing Chains Overview
Timing Chains Overview
=> [ Identifying the timing chain ]
1 Control Housing
• Oil the contact surface of the seals before installing.
• Removing and installing, refer to => [ Sealing Flange, Transmission Side ] Service and Repair, removing and installing the camshafts. Refer to => [ Camshaft ] Service and Repair.
• Overview, refer to => [ Control Housing Overview ] Control Housing Overview.
• Check the control housing strainer for contaminants before installing. Refer to => [ Control Housing Overview ] Control Housing Overview.
2 Seal
• Always replace.
3 Oil Pump
• Removing and installing, refer to => [ Oil Pump ] Oil Pump.
4 Bolt
• 8 Nm
• Install using liquid locking fluid (D 000 600 A2).
5 Chain Tensioner
• 50 Nm
• For the camshaft timing chain - item 10 -.
• Only rotate the engine with the chain tensioner installed.
6 Seal
• Replace if damaged or leaking.
7 Tensioning Rail
• For the camshaft timing chain - item 10 -.
8 Pin
• 10 Nm
• For the tensioning rail - item 7 -
9 Chain Sprocket
• For the timing chains.
• Installing, refer to => [ Camshaft Adjuster ] Camshaft Adjuster.
10 Camshaft Timing Chain
• Mark the direction of rotation before removing (installed position). Refer to => [ Identifying the timing chain ].
• Installing, refer to => [ Camshaft Timing Chain ] Camshaft Timing Chain.
11 Bolt
• 60 Nm + an additional 90° (1/4) turn.
• Always replace.
12 Exhaust Camshaft Adjuster
• Identification: 32A
• Installing, refer to => [ Camshaft Timing Chain ] Camshaft Timing Chain.
13 Bolt
• 60 Nm + an additional 90° (1/4) turn.
• Always replace.
• The sensor wheel contact surface on the bolt head must be dry when installing.
• To remove and install, counter hold the camshaft using a 27 mm open end wrench. Refer to => [ Camshaft ] Service and Repair.
14 Intake Camshaft Adjuster
• Identification: 24E
• Installing, refer to => [ Camshaft Timing Chain ] Camshaft Timing Chain.
15 Bolt
• 10 Nm
16 Chain Tensioner with Tensioning Rail
• For the oil pump timing chain - item 19 -.
• Only rotate the engine with the chain tensioner installed.
17 Drive Sprocket
• Integral part of the crankshaft.
• The ground down tooth, aligned with the main bearing cap joint = the Top Dead Center (TDC) position for cylinder 1.
• Removing and installing, => [ Oil Pump Drive Chain ] Oil Pump Drive Chain.
18 Pin
• 10 Nm
• For the guide rail - item 23 -.
19 Oil Pump Timing Chain
• Mark the direction of rotation before removing (installed position). Refer to => [ Identifying the timing chain ].
• Removing and installing, refer to => [ Oil Pump Drive Chain ] Oil Pump Drive Chain.
20 Pin
• 10 Nm
• For the guide rail - item 22 -.
21 Bolt
• 23 Nm
22 Guide Rail
• For the camshaft timing chain - item 10 -.
23 Guide Rail
• For the oil pump timing chain - item 19 -
• Remove and install together with the oil pump timing chain. Refer to => [ Oil Pump Drive Chain ] Oil Pump Drive Chain.
24 High Pressure Pump Sprocket
• With a needle bearing.
• Coat the needle bearing with oil before installing.
Identifying the timing chain
- Mark the timing chain(s) before removing (for example, with a paint arrow pointing in the direction of rotation).
• Do not mark the chain using a center punch or similar means!