6.1.3.4.2 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)
1.
Unscrew the cylinder head cover fastening screws (1)
Fig. 174 and take off both cylinder head covers (2).
2.
Pull off spark plug socket (3).
1.
Fig. 175 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°)
1.
A feeler gauge of appropriate thickness
with little resistance between rocker arm and valve.
2.
If the gap is too narrow or too wide for the feeler gauge, the
valve must be adjusted.
3.
After the adjustment tighten the nut with 5.5 lbf·ft (7.5 Nm).
Fig. 174
Fig. 175
Fig. 176
Machine assemblies – Engine
BW 900-50
162
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