Timing Chains and Adjusters Assembly Overview
Timing Chains and Adjusters Assembly Overview
• Engine is to be secured to the engine and transmission holder (VAS 6095) when performing assembly work.
• If large quantities of metal particles or abraded material are detected during engine repairs, it may be an indication of a damaged crankshaft or rod bearings. To prevent further damage, perform the following steps after the repair:
• Carefully clean oil passages
• Replace the oil check valve (if equipped)
• Replace oil injection jets
• Replace oil cooler
• Oil filter, removing and installing
1 Control housing
• Oil contact surface of sealing rings before installing.
• Removing and installing, refer to --> [ Camshafts ] Camshafts.
• Assembly overview, refer to --> [ Control Housing Assembly Overview ] Service and Repair.
• Check control housing strainer for contamination before installation, refer to --> [ Control Housing Assembly Overview ] Service and Repair.
2 8 Nm
• Insert the control housing bolts with locking compound (D 000 600 A2).
3 Camshaft timing chain
• Mark direction of rotation before removing (installation position), refer to --> [ Identifying the Timing Chain ]
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
4 Exhaust camshaft adjuster
• Identification: 32A
• Camshaft adjustor with timing chain for camshaft drive, Installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
5 Seal
• Replace.
6 Oil pump
• Removing and installing, refer to --> [ Oil Pump ] Oil Pump.
7 8 Nm
• Insert using locking fluid (D 000 600 A2).
8 Tensioning rail
• For camshaft timing chain --> [ (Item 3) Camshaft timing chain ].
9 Chain tensioner, 40 Nm
• For camshaft timing chain --> [ (Item 3) Camshaft timing chain ].
• Only rotate engine with chain tensioner installed.
10 Seal
• Replace if damaged or leaking.
11 Pivot pin, 10 Nm
• For tensioning rail --> [ (Item 8) Tensioning rail ].
12 Chain sprocket
• For timing chain --> [ (Item 17) Timing chain ].
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
13 Chain sprocket
• For camshaft timing chain --> [ (Item 3) Camshaft timing chain ].
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
14 60 Nm + 1/4 turn (90°)
• Only use bolts with strength category 10.9.
• Replace.
15 Chain tensioner with tensioning rail
• For timing chain --> [ (Item 17) Timing chain ].
• Before installation, release the locking device in the chain tensioner with a small screwdriver and press the tensioning plate against the chain tensioner.
• Only rotate engine with chain tensioner installed.
16 Drive gear
• Integral part of crankshaft.
• Ground down tooth aligned with main bearing joint = Top Dead Center (TDC) cylinder 1. Install oil pump drive timing chain. Refer to --> [ Oil Pump Drive Timing Chain, Installing ] Oil Pump Drive Timing Chain, Installing.
17 Timing chain
• Mark direction of rotation before removing (installation position), refer to --> [ Identifying the Timing Chain ]
• Install the oil pump drive timing chain. Refer to --> [ Oil Pump Drive Timing Chain, Installing ] Oil Pump Drive Timing Chain, Installing.
18 Guide rail
• For timing chain --> [ (Item 17) Timing chain ].
• Together with the timing chain, removing and installing. Install the oil pump drive timing chain. Refer to --> [ Oil Pump Drive Timing Chain, Installing ] Oil Pump Drive Timing Chain, Installing.
19 Locating pin without collar, 10 Nm
• For guide rail--> [ (Item 18) Guide rail ].
20 10 Nm
21 23 Nm
22 60 Nm + 1/4 turn (90°)
• Replace.
• Contact surface of sensor wheel at bolt head must be dry when installing.
• To remove and install, counter hold at crankshaft using an open end 27 mm wrench. Refer to --> [ Camshafts ] Camshafts.
23 Guide rail
• For camshaft timing chain --> [ (Item 3) Camshaft timing chain ].
24 Drive pinion for high pressure pump
• With needle bearing lying inside.
• Oil needle bearing before installing.
25 Intake camshaft adjuster
• Identification: 24E
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
26 Camshaft adjustment valve 1 (exhaust) (N318)
• For exhaust camshaft.
• Before disconnecting, mark allocation of connector to component.
27 Camshaft adjustment valve 1 (N205)
28 Guide rail
• For camshaft timing chain --> [ (Item 3) Camshaft timing chain ].
• Clipped in at control housing.
Identifying the Timing Chain
- Mark the timing chains before removing (e.g. with paint, arrow pointing in direction of rotation).
• Do not mark chain using a center punch or similar means!