6.8.4 Checking, adjusting the valve clearance
NOTICE!
We recommend to have this work carried out by
trained personnel or our after sales service.
Check and adjust only when the engine is cold.
Adjusting values intake valves: 0.0031 in
± 0.0079 in (0.08 ± 0.02 mm)
Adjusting values exhaust valves 0.0039 in
± 0.0079 in (0.10 ± 0.02 mm)
Unscrew the cylinder head cover fastening screws (1)
Fig. 93 and take off both cylinder head covers (2).
Pull off spark plug socket (3).
Fig. 94 clockwise until the marks (2,
3) are in line.
Cylinder 1 in top dead centre position in compres-
sion stroke. Both valves closed. If not, crank the
engine for 360°)
A feeler gauge of appropriate thickness
with little resistance between rocker arm and valve.
If the gap is too narrow or too wide for the feeler gauge, the
valve must be adjusted.
After the adjustment tighten the nut with 5.5 lbf·ft (7.5 Nm).
Fig. 93
Fig. 94
Fig. 95
Maintenance – Every 250 operating hours
BW 900-50
76
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