Cleaning And Inspection; Analysis And Actions - Husqvarna 525BX Workshop Manual

7.21 Cleaning and inspection

After dismantling, clean the individual components:
1. Scrape carbon deposits from the top of the
piston.
2. Scrape carbon deposits from the cylinder's
combustion chamber.
3. Scrape carbon deposits from the cylinder's
exhaust port.
NOTE!
Scrape carefully off soot deposits using a not
too sharp tool so as not to damage the soft
aluminium parts.
4. Wash all the components.
5. Inspect the different components for
damage and wear.
Check the piston and cylinder for seizure damage
and wear.
Also see the "Analysis and actions" section.
Check the piston ring for wear and possible break-
age.
Also see the "Analysis and measures" section.
Check the piston pin.
– If it has blued, it must be replaced.
– If it (piston pin) is worn out as shown, both
the piston and the piston pin must be replaced.
Check the needle bearing. If it is discoloured or
damaged, it must be replaced.
Check the circlips. If they exhibit cracks or are
discoloured (caused by overheating), they must be
replaced.

7.22 Analysis and actions

Experience tells us that piston or cylinder failure
due to manufacturing errors are extremely rare.
The reason is usually due to other factors, which is
evident from the following.
Note the reasons for the breakdown, repair the
damage and take the actions required to prevent
the same thing happening again.
Repair instructions
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