Volvo Penta AQUAMATIC 280 Workshop Manual page 117

Repair instructions
35. Grease the bearing box and install on the lower
unit. Tighten the allen bolts to 40 Nm (29 lb.ft.).
A
36. Place the outer bearing race on the vertical shaft
roller bearing and hold it steady in position. Use a
depth gauge to measure the height of the bearing as-
sembly "A." Note this dimension.
114
B
37. Using a depth gauge, measure "B" in special tool
884348. Subtract measurement "A" from measure-
ment "B".
B – A = positive result ( clearance dimension)
B – A = negative result (preload)
Tolerances: Max. allowed clearance dimension
0.05 mm (0.002")
Max. allowed preload 0.02 mm (0.0008")
A clearance dimension of 0.02 mm (0.0008") shall be
aspiring to attain. When a clearance dimension is
reached, shims shall be added according to the follow-
ing example:
Example:
Measurement "B"
Measurement "A"
( clearance dimension)
A 0.24 mm shim should be placed on the outer bear-
ing race. This will give a remaining play of 0.04 mm
(0.0016") which is within the tolerances.
884348
38. Insert the bearing race on the vertical shaft roller
bearing. Install shims between the bearing race and
the special tool to prevent the bearing from moving
axially. Install special tool 884348. Tighten the special
tool with two screws and nuts finger tight to prevent
axial movement but not enough to preload the vertical
shaft.
884348
10.02 mm
– 9.78 mm
+ 0.24 mm