Crankshaft And Crankcase - Husqvarna 525HE3 Workshop Manual

6.12.2 To examine the piston
• Make sure that the piston ring can move freely in the
groove.
• Examine the surface of the piston for damage and
wear.
• Examine the piston pin.
a) Make sure that the piston pin bearing is not
damaged.
b) Make sure that the piston pin does not have
discolorations.
c) Make sure that the piston pin does not have
damages on the surface against the bearing.
d) If the piston moves too easily, replace the piston
and the piston pin.
e) Make sure that the needle bearing does not
have discolorations or damages.
• Examine the snap rings. If the snap rings have
cracks or discoloration, replace them.
• Measure the piston ring groove (A). Replace the
piston if the groove is larger than 1.1 mm.
• Measure the piston ring play (B). Replace the piston
ring if the piston ring play is larger than 0.1 mm.
30 - Repair instructions
• 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.
6.12.3 To examine the cylinder
• Make sure that the surface layer of the cylinder is
not worn, especially in the top end of the cylinder.
• Make sure that the cylinder does not have score
marks.
B
A

6.13 Crankshaft and crankcase

6.13.1 To disassemble the crankcase
1. Remove the air filter cover, the cylinder cover, and
the muffler cover. Refer to
air filter cover, the muffler cover and the cylinder
cover on page 14 .
2. Remove the shaft. Refer to
the shaft on page 23 .
3. Remove the starter unit. Refer to
install the starter unit on page 14 .
4. Remove the starter pawl assembly. Refer to
replace the starter pawl assembly on page 16 .
To remove and install the
To remove and install
To remove and
To
1371 - 001 - 02.07.2020