Volvo Penta AQUAMATIC 280 Workshop Manual page 114

Shimming the outer propeller shaft
21. The nominal measurement of the aft gear is
39.50 mm. Find the variation marking on the gear. In
this case it is +10. Remember, hundreds of millime-
ters only!
Add:
Gear nominal
Gear marking
Gear measurement
22. The nominal bearing height is 20.75 mm.
NOTE! The forward and aft gear bearings have
different nominal dimensions by 0.10 mm. DO NOT
mix them up.
For the aft bearing, make sure that the inner bearing
race is marked BK-358X and the outer bearing race is
marked K354X.
Installing the bearings in the wrong location will cause
incorrect lower unit gear contact patterns, incorrect
bearing preload, and shorten gear life.
39.50 mm
+0.10 mm
39.60 mm
23. Add the gear measurement to the bearing nominal
dimension.
Add:
Gear measurement
Nominal bearing height
Total aft gear dimension
Now subtract the total aft gear dimension from the
bearing box location.
Subtract:
"C"-measurement
Gear dimension
Bearing box shims
24. Grease the bearing location with propeller shaft
grease and insert the calculated bearing box shims
from the previous step (0.31 mm). Install the bearing
race using special tool 884795.
Repair instructions
39.60 mm
+ 20.75 mm
60.35 mm
60.66 mm
- 60.35 mm
0.31 mm
884795
111