Dismantling The Cylinder And Piston - Husqvarna 525BX Workshop Manual

7.20 Dismantling the cylinder and pis-
ton
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 refined manufacturing techniques.
When servicing these components, cleanliness is of the utmost importance.
Before dismantling or other actions are performed on the cylinder block and valve mechanism it is
recommended that a compression test is made to easily determine whether any faults exist, for example,
leaking valves, leaking valve guides, damaged piston rings or a damaged piston.
Dismantle the following parts:
All covers and starter
Muffler with gasket
Spark plug
Airfilter and filter housing
Carburattor and remove the insulator.
Fly wheel and ignition module
Fan and screws holds the engine to the volute
case. Heating plate on the top of the cylinder.
Remove the 4 bolts holding the cylinder against
the crankcase.
Torque 6 ~ 8 Nm
Repair instructions
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