
62
ASSEMBLY
betamotor.com
A
B
Apply a few taps to the upper spring caps with a
double rubber hammer to help the split collets to
settle.
Fit the two roller bearings (10, 11) for the water
pump shaft into their housings in the head. The
smaller-diameter bearing (10) should be driven
fully home in its housing. The other bearing (11)
does not have a stop, therefore you must ensure
that it is located flush with the inner surface of the
timing case.
Fit the first oilseal (12) with the open side facing to-
wards the head to ensure an oiltight seal, and the
second (13) with the open side facing outwards so
as to avoid water leaks from the pump into the tim-
ing case. This last oilseal must be fitted in its hous-
ing to a depth of 1 mm. Remember to apply grease
to the outer surfaces of the oilseal.
4.17 VALVEGEAR
4.17.1 Pre-assembly of camshaft
Check the wear on the contact surfaces of the cams
with the rockers and, if you detect excessive wear or
damage, replace the camshaft (1).
Measure the maximum length of the cams (A) and
the diameter of the base circle (B).
Standard length of cam 33.258±0.030mm
diameter of cam base circle 28±0.015mm
Fit the camshaft sprocket (2) onto the camshaft (1)
with the flat face towards the cams, securing it with
the M6x10 screws and tightening to 10 Nm after
applying medium-strength thread lock.
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