Pistons - Demounting And Mounting - JAWA 350 Workshop Manual

WORKSHOP MANUAL
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using the torque spanner at the force
of 17,6 Nm. If the engine is
mounted in the frame, first remove
seat and tank, separate the exhaust
elbows and disconnect the coils,
cables and cable shoes.
1.2. Pistons – demounting and mounting
Since the piston is mounted in the
cageless needle bearing, use special tools for
demounting the piston.
There is a danger that some needles
may fall into the engine internals. This may
result into heavy damage of engine and would
be necessary to dismantle the engine and find
strayed needles. The following procedure is
reccomendable:
Take off the cylinders ( see sect. 1.1),
plug the crankcase holes, remove piston rings
and using suitable plies remove piston pin
locks.
Fit the auxiliary insert S-88 into the
piston opening and the press-out pin in the
auxiliary insert. Push the pin as far as the pin
support surface. Detach the piston from the
piston rod top end and lock the auxilary insert
S-88 (held between the needles in the piston
rod end). And the two original take-up rings to
avoid their falling down.
Prior to proceeding to mounting the
pistons, make sure that all needle rollers (28
units per rod) and the take-up rings are fitted
in the connecting rod top ends. The auxiliary
inserts S-88 must be mounted inside the
rollers. When fitting a piston on the connecting
rod top end, make sure that take-up rings and
rollers do not fall into the engine housing
internals
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