Volvo Penta 120S, Workshop Manual

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Repair - lower gear housing, sailboat drive
Pre-load
42. Check that there is no slack in the propeller shaft
Check the preload in the shaft.
Method 1 . Wind a piece of string round the shaft and
pull with spring scale 9985494 . Please refer to the fig-
ure above.
Permissible preload:
0 (no slack) – 35 N (0–7.87 lbf).
Method 2 . Install the propeller nut on the shaft. Turn
the shaft with a torque wrench. Turn at an even
speed, about 1 revolution/sec.
Permissible preload:
0.5 ± 0.3 Nm (0.37 ± 0.22 lbf ft).
When there is slack in the shaft, or the pre-load is in-
correct, change the thickness of the shims under-
neath the bearing race in the rear bearing housing.
If preload is correct: Disassemble the bearing hous-
ing and remove the propeller shaft.
Vertical shaft
44. Install a new needle roller bearing. Use tool no.
884746 .
The tool consists of three sections. Please refer to
the
Special Tools
section.
NOTE! The needle roller bearing has loose rollers. For
this reason, the new bearing has a transport shield.
Press bearing retainer 884747 into the needle roller
bearing. The transport shield (foam rubber) is then
pressed out. Insert the screw with flange
884748 from
above and the bearing retainer with needle roller bear-
ing from below. Turn the screw round until the needle
roller bearing is in place. Use a wrench on the bearing
holder to keep it in place. Then disassemble the tool.
45. Install the vertical shaft in the housing. Be careful
to ensure that the needle rollers do not fall out. Then
install the pinion. Apply thread locking fluid, Volvo
Penta part no. 1161075-5, on the threads and install
the nut.
NOTE! One side of the nut has a chamfer which
should face the pinion.
43. Install the lower one of the two bearing races. Use
mandrel 884757 .
884747
884748
9985494
884757