Volvo Penta AQUAMATIC 280 Workshop Manual page 99

Repair instructions
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5. Install the propeller shaft with its bearing box in the
gear housing. Tighten the screws with a torque of
40 Nm (29.5 lb.ft.).
NOTE! The two O-rings (1) on the bearing housing
should not be installed.
6. Check the gear backlash and measure it directly
against the vertical splines shaft. The clearance
should be 0.06–0.10 mm (0.002–0.004") resulting in a
gear backlash of 0.15–0.25 mm (0.006–0.020").
96
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7. If the backlash is found not to be correct, adjust as
follows:
If the method 1 has been used: If the backlash is
too small, increase the shim thickness underneath
the ball bearing (1) and if the backlash is too big, de-
crease the shim thickness.
If method 2 has been used: If the backlash is too
small decrease the shim thickness in the propeller
bearing housing (2) and if the backlash is too big, in-
crease the shim thickness.
8. Remove the screws and pull out the propeller shaft.
Coat the gear teeth of the gear wheel and the pinion
with marking dye. Then install the propeller shaft with
the bearing box in the gear housing. Tighten the
screws with a torque of 40 Nm (29.5 lb.ft.).