Dismantling - Husqvarna 241R 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.
40
Cylinder and piston

Dismantling

Dismantle the following components to make the cylinder accessible:
Starter, cylinder cover, muffl er grille, muffl er with heat guard plate, decompression valve
and spark plug.
Dismantle the air fi lter, carburettor and heat guard/distance piece (see chapter "Fuel
system").
Then loosen the 4 bolts holding the cylinder.
502 50 18-01
Remove the circlips from the gudgeon pin.
Dismantle the piston.
502 52 42-01
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.
Using long-nose pliers remove the
gudgeon pin circlips.
Keep your thumb over the circlip to
prevent it from fl ying out.
Push the gudgeon pin from the piston
using punch 502 52 42-01.
If the pin is too tight, carefully warm the
piston.