Cooling System; Centrifugal Cleaning "Air Injection; Winter Use - Husqvarna 51 Operator's Manual

Cooling system

To obtain the lowest possible running temperature the saw is
equipped with a cooling system.
The cooling system consists of:
1. Air intake on the starter
unit.
2. Air guide plate.
3. Fan blades on the
flywheel.
4. Cooling fins on the
cylinder.
5. Cylinder cowling
(supplies cold air over
the cylinder).
Clean the cooling system with a brush once a week, more often
in demanding conditions. A dirty or blocked cooling system
results in the saw overheating which causes damage to
piston and cylinder.

Centrifugal cleaning "Air Injection"

Centrifugal cleaning means
the following:
All air to the carburetor is
carried through the starter.
Dirt and dust is centrifuged
away by the cooling fan.
IMPORTANT! In order to
keep the function of the
centrifugal cleaning, a
continous maintenance and
care must be made.
• Clean the air intake to the
starter, the fan wings of the
flywheel, the space around
the flywheel, inlet pipe and
carburetor space.
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MAINTENANCE
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Winter use

During winter time, powder snow and cold weather can cause
running problems, such as:
• Too low engine temperature.
• Icing on the air filter and carburetor.
Therefore some special measures are required:
• Partly reduce the air inlet of the starter and by doing that
increase the engine temperature.
• Preheat the intake air to the carburetor by removing the
special plug between the cylinder and the carburetor space.
Temperature 0°C or colder:
Twist the cover flap so that
preheated air from the
cylinder can enter the
carburetor chamber to prevent
icing of the filter. Fit the rubber
seal to the fuel pipe by the
main air intake.
Temperature -5°C or colder:
If the saw is to be used in cold
weather or powder snow
conditions a special cover flap
can be fitted to the right side
of the cylinder. This restricts
the flow of cold air and
reduces the amount of snow
that is sucked in.
NOTE! If the special winterising kit has been fitted or any
measures have been taken to increase the temperature these
changes must be reversed before the saw is used in normal
temperature conditions. Otherwise there is a risk that the saw
will overheat, resulting in severe damage to the engine.
IMPORTANT! Any maintenance other than that described in
this manual must be carried out by your servicing dealer.