Timing Chain: Adjustments

Remove both cylinder head covers.
Remove all spark plugs.
Remove fan coupling with fan wheel.

Unscrew and remove splash guard.







Remove all oil lines to left and right cylinder head.







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







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







Unfasten the accessible three screws in the exhaust and intake camshafts on cylinder bank 5-8 approx. 1/2 a turn.







Turn over engine once.


CAUTION! Do not turn the engine back.

Secure crankshaft with special tool 11 2 300 in TDC position of first cylinder.
Remove special tool 11 2 300 before switching on the engine.







NOTE: Camshaft position on cylinder bank 1-4.







Fit special tool 11 2 445 /441 to camshafts on cylinder bank 1-4.







NOTE: In TDC position of first cylinder, marker bores of camshafts point upwards.
(1) Exhaust camshaft 1-4
(2) Intake camshaft 1-4







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







NOTE: In TDC position of first cylinder, marker bores of camshafts point upwards.
(3) Intake camshaft 5-8
(4) Exhaust camshaft 5-8







NOTE: When unfastening screw connection on camshaft, 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.







Loosen the remaining three screws in the exhaust and intake camshafts on cylinder bank 5-8 approx. 1/2 a turn.







Align all camshafts with open-end wrench in such a way that special tools 11 2 441/442 fit on cylinder head without clearance.







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 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.

Remove piston for chain tensioner.







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 sprocket wheels in following sequence.
The three accessible screws on left exhaust camshaft (5-8), right exhaust camshaft (1-4), left intake camshaft (5-8), right intake camshaft (1-4).







Remove special tool 11 2 300.
Remove special tools from camshafts.
Turn over engine once.







Tighten down the remaining three screws in exhaust and intake camshafts in cylinder bank 1-4 firmly.







Tighten down the remaining three screws in the exhaust and intake camshafts in cylinder bank 5-8 firmly. Tightening torque, refer to







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