Camshaft Timing Chains, Assembly Overview
Camshaft Timing Chains, Assembly Overview
1 Control housing
• Removing and installing => [ Camshafts ] Service and Repair.
• Disassembling and assembling => [ Disassembling and Assembling Control Housing ] Valvetrain Assembly Overview
• Check screen for dirt => [ Control Housing Screen, Cleaning ] Valvetrain Assembly Overview
• Lightly lubricate contact surfaces of oil seals before installing
2 Bolt
• Replace
• 8 Nm
3 Camshaft timing chain
• Before removing, mark direction of rotation with paint => [ Identify Timing Chain Direction of Rotation ]
• Remove from camshafts => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
• Removing and installing => [ Camshaft Timing Chain ] Camshaft Timing Chain.
4 Camshaft adjuster, exhaust side
• Identification: "32A"
• Removing and installing => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
5 O-ring
• Replace
6 Oil pump
• Removing and installing => [ Oil Pump ] Oil Pump.
7 Bolt
• Tightening specifications => [ Oil Pump, Assembly Overview ] Oil Pump, Assembly Overview.
8 Timing chain tensioning rail
• Remove to remove and install timing chain upper and lower covers
9 Camshaft timing chain tensioner
• Removing and installing => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
• Only rotate engine with chain tensioner installed
• 40 Nm
10 Seal
• Replace if damaged or leaking
11 Mounting pin
• Without collar
• For tensioning rail - 8 -
• 18 Nm
12 Timing mechanism drive chain sprocket
• Removing and installing => [ Timing Mechanism Drive Chain ] Timing Mechanism Drive Chain.
13 Camshaft timing chain sprocket
• Removing and installing => [ Timing Mechanism Drive Chain ] Timing Mechanism Drive Chain.
14 Bolt
• Use counter hold (T10069) on vibration damper to loosen and tighten
• Replace
• 60 Nm + 1/4 additional turn (90°).
15 Chain tensioner with tensioning rail
• For drive chain
• Before installation release locking device in chain tensioner with a small screwdriver and press tensioning plate against chain tensioner
• Only rotate engine with chain tensioner installed
16 Drive sprocket
• Integral part of crankshaft
• Ground down tooth faces in "TDC" position toward bearing joint
17 Drive chain for timing mechanism
• Before removing, mark direction of rotation with paint => [ Identify Timing Chain Direction of Rotation ]
• Removing and installing => [ Timing Mechanism Drive Chain ] Timing Mechanism Drive Chain.
18 Timing mechanism drive chain guide rail
19 Mounting pin
• Without collar
• For guide rail - 18 -
• 10 Nm
20 Mounting pin
• With collar
• For guide rail - 23 -
• 10 Nm
21 Bolt
• 23 Nm
22 Bolt
• To loosen and tighten, counter hold with open end wrench at camshaft wrench surface => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
• Replace
• Contact surface of sensor wheel at screw head must be dry when installing
• 60 Nm + 1/4 additional turn (90°).
23 Camshaft timing chain guide rail
• Removing and installing => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
24 High pressure pump drive chain sprocket
• Different versions
• On the version for vehicles without mechanical vacuum pump, lightly lubricate needle bearing side before installing
25 Camshaft adjuster, intake side
• Identification: "24E"
• Removing and installing => [ Camshaft Timing Chain, Removing from Camshafts ] Camshaft Timing Chain, Removing From Camshafts.
26 Camshaft adjustment valve 1 (exhaust) (N318)
• For exhaust camshaft
• Mark electrical connector before disconnecting
27 Camshaft adjustment valve 1 (N205)
• For intake camshaft
• Mark electrical connector before disconnecting
28 Camshaft timing chain guide rail
• Clipped in at control housing
Identify Timing Chain Direction of Rotation
- Mark timing chain running direction with arrows using paint - arrows - for reinstallation.
Risk of damaging timing chain.
• Do not mark chain with punch, notch or something similar.