Timing Case Guide Rail

PRECEDING WORK
Both front covers removed.

OVERVIEW





Intake manifold gaskets (1):
Remove, install.
Guard plate 120 589 06 31 00:
Attach to intake ports.
Crankshaft:
Turn to 30° after ignition TDC on cylinder 1 (step 3).
Timing chain:
Mark in relation to camshaft sprockets (step 4).
Chain tensioner (2):
Remove, install.
Right exhaust camshaft sprocket (3):
Unscrew, (step 6).
Guide rail (4):
Remove (step 7).
Profile gasket with cover (13):
Remove, replace (step 8).
Guide rail bridge (15):
Unscrew, remove (step 9).
Sealing surfaces:
Clean.
Contact surface of guide rail bridge (15):
Coat with sealant 002 989 00 20 10 (step 10).
Guide rail bridge (15):
Install (step 11).
Fitted bolts (16):
Install with washers downward, tighten (21 Nm) (stop 11).
Bolts (17):
Install, tighten (21 Nm) (step 11).
Timing chain:
Position on marks on camshaft sprockets (step 12).
Guide rail (4):
Install (step 13).
Flight exhaust camshaft sprocket (3):
Install with timing chain positioned on mark, tighten (16 Nm) (step 14).
Profile gasket:
Install together with cover (13) without sealant (step 15).

REMOVAL, INSTALLATION
1 Remove intake manifold gaskets.
2 Attach guard plate 120 589 06 31 00 to intake ports.





3 Turn crankshaft to 30° after ignition TDC on cylinder 1 in engine direction of rotation (arrow).

Note
In the position 30° before TDC the camshafts can be turned without the valves coming into contact with the piston crowns.





4 Marking timing chain relative to camshaft sprockets (arrows).
5 Remove chain tensioner.





6 Unscrew right exhaust camshaft sprocket (3), remove.
7 Pull guide rail (4) off of bearing bolt (4a).





8 Pull off profile gasket (arrows) together with cover (13).





9 Unscrew guide rail bridge (15) at rear, remove.
10 Clean sealing surfaces and contact surfaces on guide rail bridge (15) and coat with sealant 002 989 00 20 10.





11 Install guide rail bridge (15), screw in fitted bolts (16) with ground washers at bottom and bolts (17) at top. Tighten fitted bolts (16) first, tightening torque 21 Nm.
12 Position timing chain on paint marks on camshaft sprockets.

Note
Turn camshafts with wrench 104 589 01 01 00.

13 Slide guide rail (4) onto bearing bolt (4a).





14 Install right exhaust camshaft sprocket (3) with timing chain positioned on paint mark (arrows) and pay attention to tightening torque.





15 Install profile gasket (arrows) with cover (13) on guide rail bridge (15).

Note
Install profile rubber gasket (arrows) without sealant.

16 Install in opposite order.

TIGHTENING TORQUES IN NM






SPECIAL TOOLS