Wear Tolerances; Assembly - Husqvarna 122 HD60 Workshop Manual

Wear tolerances

Cylinder bore
When the surface coating is
worn and aluminium appears.
Cylinder and piston
Piston ring gap
Max. 1.0 mm with the piston
ring inserted in the lower part of
the cylinder.

Assembly

Lubricate the gudgeon pin's needle
bearing with a few drops of engine oil.
NOTE!
Place a rag in the crankcase opening to prevent the retaining rings from falling
into the crankcase.
Check that the retaining rings are correctly fi tted into the grooves by turning
them with fl at nosed pliers.
Check that the pulse channel in the
cylinder is open.
Assemble the cylinder with the help of
assembly set 502 50 70-01.
502 50 70-01
Piston ring groove
Max. 1.6 mm. Clean the
groove before checking the
measurement.
Assembly
Lubricate the gudgeon pin's needle
bearing with a few drops of engine oil.
Stick the spacer washers (A) in place with
a little grease on each side of the needle
bearing in the gudgeon pin.
Direct the arrow on the top of the piston
towards the exhaust port.
Press in the gudgeon pin and fi t the
circlips.
Check that the pulse channel in the
cylinder is open.
Place a new cylinder base gasket on the
cylinder or the crankcase. Lubricate the
piston and the crank bearing with a few
drops of engine oil.
Assemble the cylinder with the help of the
piston ring compressor in the assembly
set 502 50 70-01.
502 71 27-01
Piston ring play
Max. 0.15 mm. Clean the
groove before checking the
measurement.
NOTE!
Do not turn the cylinder, as the
piston ring can easily break.
Tighten the 2 screws
diagonally crosswise.
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