Service Tips; Wear Tolerances - Jonsered 2036 Workshop Manual

7

Service tips

Defect:
Broken cooling fins, damaged threads or broken screw at
exhaust port.
Seizure marks in the cylinder bore (especially at the exhaust
port).
The surface lining in the cylinder bore is worn (primarily at
the head of the cylinder).
The piston displays seizure scratches.
The piston ring is stucked in its groove.

Wear tolerances

Cylinder bore
The surface finish in worn away
revealing the aluminium.
92
Cylinder and piston
Piston ring gap
Max. 1.0 mm with the piston ring
pushed into the lower part of the
cylinder.
Procedure:
In severe cases - replace the cylinder.
Repair the thread with Heli-Coil.
Rub the damaged part with fine emery cloth to remove
adhered aluminium.
With deeper seizure scratches the cylinder and piston should
be replaced.
Replace cylinder and piston.
Rub the damaged part carefully with a fine file or emery cloth.
Before the piston is fitted the cylinder should be rubbed as
above. With deeper scratches the piston and where necessary
also the cylinder should be replaced.
Carefully loosen the piston ring and clean the groove very
carefully before replacing. Check the wear on the piston ring
by placing it in the lower part of the cylinder.
Piston ring groove
Max. 1.6 mm. Clean the groove
carefully before checking the mea-
surement.
Piston ring play
Max. 0.15 mm. Clean the groove
carefully before checking the mea-
surement.