41
DATE
22.12.2003
COMPILER TECO/ATI
REG. CODE
1-5302-467
MODEL N°
50707
DATE OF ISSUE
06-95
REVISION 05
ENDORSED
VIII
69 70
71
72
DISASSEMBLY/REASSEMBLY
Automatic decompression
With the engine at a standstill and up to a rate of about 300 RPM,
spring 1, acting on weights 2 and 3 via lever 4 and pin 5, keeps the
exhaust valve open during the compression phase also.
Once the engine exceeds the 300 RPM rate, weights 1 and 2 keep
pin 5 in the hold position owing to the action of the centrifugal force.
In this position, cam 6 can regularly control the exhaust valve thanks
to a ridge on the pin itself.
Since there is then no compression in the cylinder, the engine will
easily start when the self-winder is used.
Camshaft end play
Perform this check before fitting cylinder head and tappets including
the injection tappets.
Temporarily fit camshaft 1 complete with washer; tighten gear cover
2 to 25 Nm.
Check end play by moving the camshaft back and forth using a
suitable tool; the end play value is 0.10÷0.25 mm and is not
adjustable.
Dynamic balancer (on request)
The dynamic balancer is supported by two identical ball bearings
housed in the crankcase and in the gear cover on the timing side
respectively.
1 is the reference point for timing with the cranksaft gear (see
below).
Dimensions (mm):
A = 14.983-14.994
B = 14.99-15.00
C = 34.89-35.00
D = 34.958-34.983 (bearing housing diameter on crankcase and
gear cover on timing side).
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