55
5
505 38 17-05
Cylinder and piston
Assembly
All models
Fit the piston on the connecting rod.
Make sure that the arrow on the piston top
is turned to the exhaust port.
Assembly
All models
Before fitting the piston and cylinder see
the section ”Cleaning, inspection” and
”Analysis and procedures”.
Lubricate the piston bolt’s needle bearing
with a few drops of engine oil.
Align the arrow on the piston top with the
exhaust port.
Press in the piston bolt by means of the
mandrel 505 38 17-05 and fit the circlips
by means of a pair of flat pliers. Check
that they sit correctly in their grooves by
turning them with the pliers.
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 assembly. Check the wear on the piston ring
by placing it in the lower part of the cylinder.
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
Piston ring gap
The surface finish is worn away
revealing the aluminium.
Max. 1.0 mm (0.04") with the piston
ring pushed into the lower part of
the cylinder.
Max. 0.15 mm (0.006"). Clean the
groove carefully before checking
the mea-surement.
Max. 1.6 mm (0.06"). Clean the
groove carefully before checking the
mea-surement.
Piston ring groove
Piston ring play
Содержание K 650/700 Active
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