Removing and Installing Left Cylinder Head (N62 Up To 09/03)
11 12 105 - Removing and installing left cylinder head (N62 to 09/03)
(cylinder bank 5 to 8)
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 left 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 left side of engine block.
Drain and dispose of coolant.
Installation Note:
Replace sealing ring.
Tightening torque of drain plug 11 11 5AZ 11 11 Engine Block.
Top up coolant. Vent cooling system and check for leaks Venting Cooling System and Checking for Water Leaks.
Remove ignition coils on cylinder bank 5 to 8.
Remove servomotor for left eccentric shaft Removing and Installing/Replacing Servomotor for Left Eccentric Shaft (N62/N62TU).
Remove left cylinder head cover [1][2]Removing and Installing/Sealing Left Cylinder Head Cover.
Remove intake air manifold Service and Repair.
Remove left timing case cover Removing and Installing Top Left Timing Case Cover (N62/N62TU).
Unfasten plug connection.
Place engine wiring harness to one side.
Remove spark plugs on cylinder bank 5 to 8.
Remove vent hose on cylinder head.
Note:
Illustration with engine removed.
Detach hose (1) on check valve (2).
E65 only:
Release screws (3).
Remove tube (4) with check valve (2).
Note:
Do not remove guide tube (5) for oil dipstick.
Installation:
Replace sealing ring on tube (4) and coat with antiseize agent.
Removal:
Removal of cylinder head is described separately from installation.
Remove inlet and exhaust adjustment unit on left side Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Left Side (N62/N62TU).
Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).
Pretension torsion spring (1) with a cable strap (2), 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.
Note:
At narrow points, use a socket with 3/8" drive and a short extension.
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.
Installation:
Installation of cylinder head is described separately from removal.
Clean sealing faces of cylinder head and engine block, if necessary using wooden scraper to remove gasket debris. 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).
Coat joint between engine block and timing case cover with Drei Bond 1209 (refer to BMW Parts Service).
Check dowel sleeves (1) for damage and correct installation position.
Fit new cylinder-head seal.
Put the cylinder head on.
Note:
Cylinder head bolt (7) cannot be inserted yet.
Do not wash off screw 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:
At narrow points, use a socket with 3/8" drive and a short extension.
Tighten down the cylinder-head bolts in order 1 ... 10.
Tightening torque 11 12 8AZ 7AZ - 8AZ.
Insert and tighten down screws between cylinder head and timing case cover.
Insert and tighten down guide rail screw.
Replacement:
Release screw (1).
Note:
Illustration shows (cyl. 1-4).
Grip at dihedron and release screw (1).
Convert lever (2) with roller.
Important!
Levers (2) with rollers of cylinders 1 to 4 and 5 to 8 are different and must not be mixed up.
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 (1) with a cable strap (2) 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).
Install inlet and exhaust adjustment unit on left side Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Left Side (N62/N62TU).
Assemble engine.