19
Cylinder head
Valve clearance, adjustment
(12A–03)
Special tools: 885024, 885025, 885037
If when checking valve clearance, operation 12A-
02, it appears that the adjustment is necessary car-
ry on as follows:
1
Turn the crankshaft until the adjustment hole in the
camshaft front bearing journal is at “12 o’clock”.
Install the adjustment drift 885037 through the rear
plate or through the flywheel cover using the fly-
wheel adjustment hole.
2
Remove the cap of the timing cover, operation
15A-01.
3
Remove the mounting screws for the camshaft pul-
ley and the mounting screw for the pulley hub.
4
Install two screws (M6 x 50) to hold the fuel injec-
tion pump pulley.
5
Remove the timing belt, the camshaft pulley and the
pulley hub see section 15.
6
Remove the seawater pump, operation 20A-06 and
the mounting bracket for the pump, operation 20A-
08.
7
Remove the camshaft mountings and remove the
camshaft (12A.07/A). Remove the stuffing boxes
from the camshaft.
Install the camshaft mountings 885024 (A1) to hold
the camshaft and mount the mountings with the rel-
evant mounting screws for the cover. It is vital to
move the rear camshaft stuffing box on the cam-
shaft to secure sufficient clearance between the
rear mounting and the stuffing box. Ensure that the
sprung pads are correctly installed on the camshaft
bearing journals and tighten the mounting screws
for the mountings evenly.
4
Turn the crankshaft until the tips of cams 1 and 3
are both near their highest point. Use a feeler gauge
with a bent blade to measure the valve clearance
for valves 1 and 3. Make a note of the clearance.
5
Repeat point 4 for valves 2 and 5, 6 and 8 and 4 and
7.
6
Adjustment is only necessary if play lies outside the
0.20-0.40mm for the inlets valve or 0.30-0.50 for the
exhaust valves. If adjustment is necessary see op-
eration 12A-03.
7
When the clearance is correct remove the mount-
ings for the camshaft bearing journals and install
the camshaft cover, operation 12A-01.
8
Connect the battery.
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