22
WORKSHOP MANUAL
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III.
CRANK MECHANISM DISMANTLING AND REASSEMBLY
3.1.
Crank mechanism dismantling
Using the nr.12 tubular spanner,
unscrew the nuts holding together the two part
face plate and separate two halves of the plate.
Never use a chiesel or a screwdriver for this
operation. Apply a set square on to the
flywheels and make index lines with the scriber
to mark their mutual position. Preferably in 90 °
from the axis of the crankpins. For pressing the
flywheel apart and for their subsequent pressing
together, you will need a press with a pressure
of about 8-10 tons and a special two part
supporting jig (S-205 pressing jig).
When replacing connecting rods (replace always
the complete rod along with its pins) press out
first the end flywheel, také off the connecting
rod and press the mid bearing pin out of the
nearest mid flywheel. Press the connecting rod
out of the latter flywheel. If replacing the mid
pin, labyrinth bearings or mid ring, dismount the
crank completely to pieces.
3.2.
Mounting the crank mechanism
a)
Press connecting rod pins in the inner flywheels,
whereby the faces of the pins must get in line with the
flywheel outer surface. The pins must face in the precise
perpendicular position the flywheel surface. For this job
use a set square or the guide, which is includet in set of
special tools for work on the crank mechanism.
b)
Fit the connecting rod with bearing and distance washer on the left inner flywheel pin.
Attach the outer flywheel, adjust it with the set square and press it in. After having finished
the pressing job, check the gauge lines the crank mechanism was marked with before it was
dismantled (must be in line). Use a copper mallet for the readjustment