Engine Code CNNA
Chain Drive Overview
1 Control Housing
• Oil the contact surface of the seals before installing.
• Removing and installing, refer to => [ Camshafts ] Service and Repair.
• Assembly overview, refer to => [ Control Housing Overview ] Control Housing Overview.
• Check the control housing strainer for contamination before installation. 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.
10 Timing Chain
• For the camshafts.
• Mark the direction of rotation before removing (installed position).
• Removing and 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
• Removing and installing, refer to => [ Camshaft Adjuster with Timing Chain, Installing ] Camshaft Adjuster with Timing Chain, Installing.
13 Bolt
• 60 Nm + an additional 90° (1/4) turn.
• Always replace.
• The contact surface of the sensor wheel at the bolt head must be dry when installing.
• When removing and installing, counter hold the camshaft using a 27 mm open end wrench. Refer to => [ Camshafts ] Service and Repair.
14 Intake Camshaft Adjuster
• Identification: 24E
• Removing and installing, refer to => [ Camshaft Adjuster with Timing Chain, Installing ] Camshaft Adjuster with Timing Chain, Installing.
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 milled tooth aligned with the crankshaft main bearing cap joint = Top Dead Center (TDC) for cylinder 1, install the oil pump timing chain. Refer to => [ Camshaft and Oil Pump Timing Chains ] Camshaft and Oil Pump Timing Chains.
18 Pin without Collar
• 10 Nm
• For the guide rail - item 23 -.
19 Timing Chain
• For the oil pump.
• Mark the direction of rotation before removing (installed position).
• Installing, refer to => [ Oil Pump ] Oil Pump.
20 Pin
• 10 Nm
• For the guide rail.
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 -.
• Together with the camshaft timing chain, removing and installing. Install the oil pump timing chain. Refer to => [ Oil Pump ] Oil Pump.
24 Drive Sprocket
• For the high pressure pump.
• With needle bearings.
• Oil the needle bearing before installing.
Identifying the Timing Chains
- Mark the timing chains 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!