Dismantling - Husqvarna 226R Workshop Manual

6
The cylinder and the piston are two of the components exposed to most strain in the engine. They must withstand, for
example, high speeds, large temperature swings and high pressure. Moreover, they must be resistant to wear. Despite
these tough working conditions, major piston and cylinder failure is relatively uncommon. The reasons for this include
new coatings in the cylinder bore, new types of oil and grease and refi ned manufacturing techniques.
When servicing these components, cleanliness is of the utmost importance. It is therefore recommended that the
cylinder and the area around it be thoroughly cleaned before being dismantled from the crankcase.
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Cylinder and piston

Dismantling

Dismantle the following components to make the cylinder accessible:
Cylinder cover, muffl er with heat protective plate against the cylinder, spark plug and
ignition module.
Dismantle the air fi lter, carburettor and distance piece.
Then loosen the 2 bolts holding the cylinder.
502 50 19-01
502 50 18-01
Remove the circlips from the gudgeon pin.
Dismantle the piston.
505 38 17-05
Carefully remove the cylinder
straight up by rocking it backwards
and forwards. Make sure that no
dirt enters the crankcase.
Use a rag to cover the crankcase
opening under the piston.
Use a pointed tool to remove the gudgeon
pin circlips.
Keep your thumb over the circlip to pre-
vent it from fl ying out.
Push the gudgeon pin from the piston
using punch 505 38 17-05.
If the pin is too tight, dismantling is facili-
tated by carefully heating the piston using
a hot air gun.
NOTE!
Do not lose the spacers that are on
each side of the little-end.