Safety Manual

MS 251, MS 251 C
English
46
N Wash the filter in STIHL special
cleaner (special accessory) or a
clean, non-flammable solution (e.g.
warm soapy water). Rinse the filter
from the inside outwards under a jet
of water – do not use a pressure
washer.
N Dry the filter components – do not
expose to high temperatures.
NOTICE
High temperatures and oil can damage
the air filter. Filter efficiency can
deteriorate as a result.
– Allow air filter to dry without using
any external source of heat.
– Do not impregnate the filter with oil.
N Install the air filter.
Cleaning the air filter (HD2 filter)
N Knock out the filter.
N Spray outside of filter with STIHL
special cleaner or soapy water.
N Rinse outside of filter under warm
running water.
NOTICE
High temperatures and oil can damage
the air filter. Filter efficiency can
deteriorate as a result.
– Allow air filter to dry without using
any external source of heat.
– Do not impregnate the filter with oil.
N Allow air filter to dry.
N Install the air filter.
Installing the air filter
N Place the air filter in position.
N Push the air filter in the direction of
the filter housing and turn it
clockwise at the same time until it
engages – the "STIHL" name must
be horizontal.
N Install the shroud – see "Shroud".
Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
2710BA001 KN
2.
1.
Engine Management