Checking, adjusting the valve clearance
BOMAG
57
008 921 86
6.8
6.8
Checking, adjusting the valve
clearance
!
Caution
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)
Fig. 15
l
Unscrew the cylinder head cover fastening screws
(1) (Fig. 15) and take off both cylinder head covers
(2).
l
Pull off spark plug socket (3).
Fig. 16
l
Turn the flywheel (1) (Fig. 16) clockwise until the
marks (2, 3) are in line.
i
Note
Cylinder 1 in top dead centre position in compression
stroke. Both valves closed. If not, crank the engine for
360°)
Fig. 17
l
A feeler gauge of appropriate thickness (Fig. 17)
must fit with little resistance between rocker arm
and valve.
l
If the gap is too narrow or too wide for the feeler
gauge, the valve must be adjusted.
l
After the adjustment tighten the nut with 5.5 lbf·ft
(7.5 Nm).
Fig. 18
l
Turn the flywheel clockwise further (Fig. 18), until
the marks (2, 3) are in line.
l
Check and , if necessary, adjust the valve clearance
of the 2nd cylinder.
l
After checking and adjusting reassemble the cylin-
der head covers with new gaskets.
l
Tighten the cylinder head screws.
i
Note
After a short test run check the engine for leaks.
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