Maintenance every year
BOMAG
49
BP 20/50, BP 25/50
Maintenance every year
5.17 Checking, adjusting the
valve clearance
i
Note
Check and adjust only when the engine is cold.
Fig. 56
l
Loosen the screws (1) and take off the valve
cover (2) (Fig. 56) with gasket (3).
Fig. 57
l
Set the piston to top dead centre position of
the compression stroke.
l
For this purpose align triangle mark (1) (Fig.
57) on the starter disc to the top bore (2).
Check the valve clearance
Fig. 58
l
Check the valve clearance with a feeler gauge
on both valves (1) (Fig. 58).
i
Note
Exhaust valve clearance: 0.20 mm
Intake valve clearance: 0.15 mm
Adjust the valve clearance
Fig. 59
l
Hold hexagon nut (4) (Fig. 59) on the rocker le-
ver and loosen counter nut (3).
l
Adjust hexagon nut (4) on the rocker arm so
that the feeler gauge fits between rocker arm
and valve shaft (1) with noticeable resistance
after retightening counter nut (3).
l
Install the valve cover with a new gasket and
tighten the screws evenly.
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