Rocker Arms / Pushrods - Stihl BR 500 Service Manual

Observe rocker arms while rotating
the fanwheel. If the valves are
operated by the rocker arms in this
position (valve overlap), rotate the
crankshaft another turn until the
valves are idle (ignition TDC). Turn
the crankshaft back and forth a little
to check again that the valves are
not operated in this position.
3
1
2
: Insert feeler gauge
4180 893 6400 (1) between
rocker arm and valve stem.
The feeler gauge must slip through
with a certain resistance.
Inlet valve (2) = 0.10 ± 0.02 mm
Exhaust valve (3) = 0.10 ± 0.02 mm
BR 500, BR 550, BR 600
Adjusting valves
Valve clearance is adjusted with the
locknuts (arrows).
To increase valve clearance:
Loosen the nut.
To reduce valve clearance:
Tighten the nut.
– Turn engine over several times,
check valve clearance again and
adjust if necessary.
Assemble all parts in the reverse
sequence.
– Thoroughly clean the sealing
faces on the cylinder and cover.
Fit a new gasket.
7.3

Rocker Arms / Pushrods

– Remove the inner fan housing,
b 11.2
– Take out the locking screw
4282 890 2700.
– Remove the valve cover, b 7.2
– Set the piston to ignition TDC,
b 7.2
1
: Remove the locknut (1).
: Remove the sleeve (1).
1
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