Replacing Left Camshaft

(intake or exhaust side as applicable) Cylinder bank 5-8
Remove both cylinder head covers.
Remove all spark plugs.

Remove piston for chain tensioner.
Unscrew and remove splash guard.







Remove all oil lines to left and right cylinder head.

Removal
Removal of camshaft is described separately from installation. Assembly sequence for removal and installation is different.







Crank engine at central bolt in direction of rotation until the first cylinder is in TDC position.







Unfasten the accessible three screws on exhaust and intake camshafts on cylinder bank 1-4 approx. 1/2 a turn.







Crank engine once engine wise up to TDC position of first cylinder.







NOTE: When camshaft screw connection is unfastened, brace camshaft on hex head.

CAUTION! Do not damage the cylinder head.
Machine open-end wrench accordingly if necessary.







Unfasten the remaining three screws on the exhaust and intake camshafts on cylinder bank 1-4 approx. 1/2 a turn.

Remove top left timing case cover.







Remove sprocket on left intake camshaft (cylinder bank 5-8).
Secure chain to prevent it from dropping.







Rotate engine into 45° before TDC setting.


NOTE MARKINGS!
Crank engine at central bolt against direction of rotation until gap in increment gear fits in special tool 11 3 440.







Unfasten sprocket wheel screw connection.







To relieve load on chain, compress chain tensioner.







Lock chain tensioner with special tool 11 3 420.







Lift off both sprockets complete with chain.







Move camshafts on cylinder bank 5-8 into installation position.
Rotate exhaust and intake camshafts with special tool 11 3 430.







Recesses in camshafts point approx.30.. .40° downwards from plane of cylinder head.







Check installation position with special tool 11 2 430.


NOTE: Cylinder designation 5-8 on special tool 11 2 430 point upwards.







Uniformly untighten bearing covers on camshafts for cylinder bank 5-8 in 1/2 turn stages from outside to inside.
Remove bearing covers and place to one side in orderly fashion.
Lift out camshafts.

Installation
Installation of camshaft is described separately from removal. Assembly sequence differs between removal and installation.







Camshaft designation:
(3) Hex head on intake camshaft 5-8 between cylinders 7 and 8.
(4) Hex head on exhaust camshaft 5-8 between cylinders 5 and 6.







Install camshafts.
Recesses in camshafts point downwards at angle of approx. 30 - 40° from plane of cylinder head.







Check installation position with special tool 11 2 430.


NOTE: Cylinder designation 5-8 on special tool 11 2 430 point upwards.







CAUTION! Do not confuse camshaft bearing covers of cylinders 1 4 and 5-8.


NOTE: Exhaust camshaft bearing covers are legibly marked with A1 - A5 from intake side.







NOTE: Intake camshaft bearing covers are legibly marked wit E1 - E5 from intake side.







Fit bearing covers.
Tighten bearing covers of camshaft cylinder bank 5-8 1/2 turn stages evenly from outside to inside.
Tightening torque:
M6 screw = 10 Nm
M7 screw = 15 Nm
M8 screw = 20 Nm






Secure special tool 11 3 430 to camshaft.







Rotate camshafts until marker bores face upwards.
(3) Intake camshaft 5-8
(4) Exhaust camshaft 5-8







Fit special tool 11 2 446 /442 to camshafts on cylinder bank 5-8.







Fit special tool 11 2 445 /441 to camshafts on cylinder bank 14.







Align all camshafts with open-end wrench in such a way that special tools 11 2 445 /4411446 /442 fit on cylinder heads without gaps.


CAUTION! Do not damage the cylinder head.
Machine open-end wrench accordingly if necessary.







Fit special tool 11 2 443 to special tool 11 2 446 /442 and secure with special tool 11 2 444 using the spark plug thread.







Fit special tool 11 2 443 to special tool 11 2 445 /441 and secure with special tool 11 2 444 using the spark plug thread.







Fit secondary sprockets and chain to camshafts on cylinder bank 5-8. Align long bores centrally. Remove special tool 11 3 420 from chain tensioner.







Install screws in exhaust camshaft on cylinder bank 5- and fit flush.







Rotate engine from 45° before TDC position engine- wise until in TDC position.
Hold crankshaft in TDC position with special tool 11 2 300.


CAUTION! Remove special tool 11 2 300 before switching on the engine.







Fit sprocket and chain to intake camshaft on cylinder bank 5-8 in such a way that arrow on cylinder axis face upwards and long bores are centrally aligned. Insert screws and fit flush.







Install special tool 11 3 390 in right timing case cover.







Tighten tensioning rail by turning the adjusting screw 0 the special tool 11 3 390 with special tool 00 9 250 to 1.3 Nm.


NOTE: If installation tolerance is unfavorable, attach special tool 00 9 250 from underside.

Tighten sprockets in following order:
All screws on left exhaust camshaft, three screws on right exhaust camshaft, all screws on left intake camshaft, three screws on right intake camshaft.







Remove special tools 11 2 444/443/441/445.







Remove special tools 11 2 444/443/442/446.







Remove special tool 11 2 300.
Turn over engine once.
Tighten down remaining three screws on exhaust and intake camshafts on cylinder bank 1-4 firmly.







Loosen special tool 11 3 390 and remove.
Assemble engine.