Husqvarna 322HD60 Workshop Manual page 36

• Examine the piston pin.
a) If it is blue, it must be replaced.
b) The piston pin must be stable or the piston and
the piston pin must be replaced.
c) If the needle bearing has discoloration or
damages, replace it.
• Examine the snap rings. If they have cracks or
discoloration, replace them.
7.13.4 To examine the piston
• Make sure that the piston pin bearing is not
damaged.
• Make sure that the piston pin does not have
damages on the surface against the bearing.
• Make sure that the piston ring can move freely in the
groove.
• Put the piston ring in the cylinder and measure the
space with an air gap tool. The space must not be
more than 1 mm.
36 - Repair instructions
• Examine the surface of the piston.
A
Score marks on the pis-
ton (A).
Carbon buildup (B).
Piston ring damage.
• Clean and examine the piston ring groove. It must
not be more than 1.6 mm.
B
The carburetor is incor-
rectly adjusted. Too high
engine speed
Too low octane fuel.
Incorrect oil mixture in
the fuel.
The carburetor is incor-
rectly adjusted.
Incorrect oil mixture in
the fuel.
Too high engine speed.
Piston ring worn out.
Too large piston ring
groove.
1369 - 001 - 13.02.2020