Removing and Installing Right Cylinder Head
Removing And Installing Right Cylinder Head (N62)
Special Tools Required:
^ 00 9 120
(Cylinder Bank 1 to 4)
Note: To remove the exhaust manifolds, the engine must be secured in the installation position with the special tool and then the front axle bracket lowered.
Remove right exhaust manifold.
After removing exhaust manifolds:
Reinstall front axle bracket provisionally and remove special tool for securing engine in installation position.
Open drain plug for coolant on right side of engine block.
Drain and dispose of coolant.
Installation:
Replace sealing ring.
Drain Plug for Coolant in Engine Block
M14 x 1.5 25 Nm
Top up coolant. Vent cooling system and check for leaks.
Remove ignition coils on cylinder bank 1 to 4.
Remove servomotor for right eccentric shaft.
Remove right cylinder head cover.
Remove intake air manifold. Service and Repair
Remove right timing case cover. Removal and Replacement
Disconnect plug connections and lay engine wiring harness to one side.
Remove spark plugs on cylinder bank 1 to 4.
Remove vent hose on cylinder head.
Note: Illustration with engine removed.
Detach hose (1) on check valve (4). Loosen screws (2).
Caution: A spacer bushing is secured with screw (3) behind tube (5).
Release screw (3) and remove check valve (4), tube (5) and spacer bushing.
Unclip cables (6 and 7).
Installation:
Replace sealing ring on tube (5) and coat with antiseize agent.
Removal
Removal of cylinder head is described separately from installation.
Remove inlet and exhaust adjustment unit on right side.
Slacken off chain tensioning piston (1) by approximately one turn.
Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).
Pretension torsion spring (2) with a cable strap (1), feed out from roller (3) and carefully relieve tension.
Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.
Note: Spring mount (1) has a locating pin opposite screw.
Release screw.
Feed spring mount (1) upwards out of locating pin.
Note: Illustration with engine removed.
Remove eccentric shaft sensor (2).
Detach guide rail from cylinder head.
Release screws between cylinder head and timing case cover.
Slacken off cylinder head bolts by one turn in sequence 10 ...1
Rotate eccentric shaft at dihedral head as shown in illustration and hold in this position.
Remove cylinder head bolt (7).
Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.
Remove remaining cylinder head bolts.
Lift off cylinder head.
Lift off cylinder head gasket.
Remove chain tensioning piston (1).
Place chain tensioning piston (1) on a level surface and compress slowly and carefully.
Repeat this procedure twice.
Installation
Installation of cylinder head is described separately from removal.
Clean sealing faces of cylinder head and engine block, if necessary, remove gasket debris using a wooden scraper. Make sure no gasket debris drops into the oil and coolant ducts.
Threaded bores in engine block must be free of dirt and oil (risk of cracking).
Replace sealing ring.
Install chain tensioning piston (1) and initially tighten screw connection without play.
Coat joint between engine block and timing case cover with Drei Bond 1209.
Check dowel sleeves (1 ) for damage and correct installation position.
Install new cylinder head seal.
Put the cylinder head on.
Note: Cylinder head bolt (7) cannot be inserted yet.
Do not wash off bolt coating. Insert new cylinder head bolts and initially tighten so that they are free of play.
Rotate eccentric shaft at dihedral head as shown in illustration and hold in this position.
Insert cylinder head bolt (7).
Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.
Note: Use special tool 00 9 120 as a torsion angle bracket.
Tighten down the cylinder-head bolts in order 1 ... 10.
Cylinder head bolts
M10
Jointing torque 30 Nm
Torque Angle 80°
Torque Angle 80°
Insert and tighten down screws between cylinder head and timing case cover.
Insert and tighten down guide rail screw.
Note: Spring mount (1) has a locating pin opposite screw.
Attach spring to spring mount (1).
Insert locating pin of spring mount (1) into locating bore in cylinder head.
Install screw and tighten down.
Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).
Pretension torsion spring (2) with a cable strap (1) and carefully fit on roller (3).
Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.
Note: Illustration with engine removed.
Install eccentric shaft sensor (2).
Tighten down chain tensioning piston (1).
Cylinder for chain tensioner plunger
M22 x 1.5 65 Nm
Install inlet and exhaust adjustment unit on right side.
Assemble engine.