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Maintenance every year
6.17 Check, adjust 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
(approx. 20 °C (68 °F)).
Fig. 59
Loosen the screws (1) (Fig. 59) and take off
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the valve cover (2) with gasket (3).
Fig. 60
Set the piston to top dead centre position of
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the compression stroke.
For this purpose align the alignment mark (1)
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(Fig. 60) on the starter disc to the top bore (2).
BP 20/50, BP 25/50
Check the valve clearance
Valve clearance:
Intake valve = 0.15 mm (0.006 in)
Exhaust valve = 0.20 mm (0.008 in)
Fig. 61
Check the valve clearance with a feeler gauge
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on both valves (Fig. 61).
Adjust the valve clearance
Fig. 62
Hold hexagon nut (4) (Fig. 62) on the rocker le-
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ver and loosen counter nut (3).
Adjust hexagon nut on the rocker arm so that
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the feeler gauge fits between rocker arm (2)
and valve shaft (1) with noticeable resistance
after retightening counter nut.
Install the valve cover with a new gasket and
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tighten the screws evenly.
BOMAG
Maintenance every year
53
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