Piston And Cylinder - Husqvarna 570 Workshop Manual

Piston and Cylinder

Dismantling
1. Dismantle the following parts:
• Cylinder cover.
• Spark plug.
• Carburettor. See page 32.
• Muffler. See page 15.
2. Unscrew the anti-vibration spring (C) from the
cylinder. See fig. 1.
3. Unscrew the cylinderʼs four bolts (A). See fig. 1.
4. Carefully lift up the cylinder.
NOTE!
Exercise care so that dirt and foreign partic-
les do not get into the crankcase.
5. Cover the crankcase opening immediately with a
sheet of paper or a cloth. See fig. 2.
6. Remove one of the pistonʼs circlips, press out the
gudgeon pin, and remove the piston. See fig. 2.
7. Remove the needle bearing from the connecting
rodʼs little-end.
8. Unscrew the decompression valve (B). See fig. 1.
9. Disconnect impuls hose (A) and unscrew the intake
manifold. See fig. 3 and fig. 4.
Cleaning and inspection
Clean all parts, scrape off all the remains of any gasket
material and scrape off carbon deposits from the following
surfaces:
1. The piston crown.
2. Top of the cylinder bore (inside).
3. The cylinder exhaust port.
4. The decompression valve.
PISTON and CYLINDER
A
Fig. 1
Fig. 2
A
Fig. 3
Bx3
Fig. 4
B
C
English – 43