Volvo Penta 120S, Workshop Manual

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Repair - lower gear housing, sailboat drive
Flank clearance
50. Install tool 884264 or 884830 on the vertical shaft.
Turn the shaft clockwise with a heavy wrench or
torque wrench. Wrench size:
17 mm.
NOTE! The nut must be tightened so hard that the fer-
rule is deformed. The torque needed is about
230–250 Nm (169.64–184.40 lbf ft) .
The flank clearance is zero (0) before the nut begins
to nip up.
51. When the highest torque specified above has been
reached, the gear housing should be removed from
the vice and fixed vertically instead. Let the tool re-
main on the gear housing.
Install dial gauge 9999683 on the propeller shaft
splines. Tap the vertical shaft from above, so that it
comes as far down as possible. Turn the propeller
shaft forwards and backwards.
Flank clearance : 0.04-0.10 mm (0.002-0.004")
If the clearance is too small, the nut must be tight-
ened a further turn. 1/4 turn is about 0.02–0.03 mm
(0.0008–0.0012") .
IMPORTANT! Only tighten a small amount at a
time, and check the clearance each time.
If the flank clearance becomes too large, the vertical
shaft must be disassembled and the ferrule changed,
since it can only be used once.
9999683