Dismantling The Piston And Cylinder - Husqvarna TrioBrake 550XPG Workshop Manual

Repair Instructions

7.22 Dismantling the piston and cylinder

1
Dismantle:
• The cylinder cover
• The carburettor (see "Dismantling the
carburettor")
• The muffler
• The vibration element
• The spark plug cap
• The intake system
2
Unscrew the cylinder's four screws
and carefully lift away the cylinder and the gasket.
See figure 60.
NOTE!
Take care to prevent any dirt and foreign
particles from entering the crankcase.
3
Cover over the crankcase opening.
4
Remove the circlips for the gudgeon pin and press
out the gudgeon pin. The lift off the piston. See
figure 61.
5
Remove the gudgeon pin bearing (the needle
bearing) using a pliers. See figure 61. Replace with
a new bearing.
Cleaning and inspection of the cylinder
Clean all components, scrape off all gasket re-
mains and soot from the following areas:
• The piston crown
• The top of the cylinder bore (inside)
• The cylinder exhaust port
• The base of the cylinder and/or crankcase
60
- English
Fig 60
Fig 61