Husqvarna 131RB Workshop Manual page 58

8.13.5.3 To measure the piston ring groove and piston
ring play
1. Clean and measure the the piston ring groove (A).
The groove must not be larger than 1.6 mm.
Replace the piston if the groove is larger than 1.6
mm.
2. Clean the piston ring groove and measure the piston
ring play (B). The piston ring play must not be larger
than. 0.15 mm. Replace the piston ring if the piston
ring play is larger than 0.15 mm.
8.13.6 To assemble the cylinder and piston
1. Lubricate the needle bearing of the wrist pin with
some drops of engine oil.
2. Point the arrow on the top of the piston in the
direction of the exhaust port. Push the wrist pin and
attach the piston rings.
Note: Put a cloth in the crankcase opening to make
sure that the piston rings do not fall into the
crankcase. Make sure that the piston rings are
correctly attached in the grooves.
58 - Repair instructions
3. Make sure that the pulse channel in the cylinder is
open. Put a new cylinder base gasket on the
crankcase. Lubricate the piston and the large end
bearing with some drops of engine oil. Use the
piston ring compressor and carefully move the
cylinder into position.
B
A
4. Tighten the 4 screws diagonally.
5. Assemble the distance piece and heat shield on the
cylinder.
6. Assemble remaining parts in the opposite sequence
as set out for disassembling. Refer to
to the cylinder and piston on page 51
CAUTION: Do not turn the cylinder. The
piston rings break easily.
627 - 002 - 23.04.2018
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