Volvo Penta Aquamatic 250C Workshop Manual page 21

If the pattern is too high up on the tooth, the gear on
the propeller shaft should be moved outwards, and if
the pattern is too low, the gear should be moved in-
wards.
NOTE: If several shims are placed under the drive
shaft ball bearing in the gear housing, the drive will be
moved upwards. If several shims are placed in the
propeller bearing housing under the propeller bearing,
the propeller shaft gear will be moved into the hous-
ing.
Fitting the axial bearing
Release the nut on the vertical shaft. Determine the
thickness of the shims (42), which are to be between
the ball bearing (10) and the axial bearing (18) as fol-
lows:
1. Measure the distance from the inner ring of the ball
bearing to the surface of the gear housing, dimension
"A" in Fig. 26.
Fig. 24
Fig. 25
2. Measure the width of the axial bearing by placing a
number of shims (11) on a flat disc and then locating
the bearing as shown in Fig. 27. The total dimension
of the shims is then subtracted from the dimension
obtained during the measuring.
NOTE: If no shims are placed under the outer bearing
face, no measurement can be made as this will result
in the roller retainer lying against the flat disc so that
the measuring will be faulty. Then deduct the dimen-
sion "A" from the value obtained above.
Fig. 26
Fig. 27
19