Shaft assembly
The Shaft arrangement is largely
maintenance-free. Even the external rubber
cutlass bearing is water-lubricated. Running
it dry will quickly destroy it. See the VOLVO
service sheet for instructions on how to vent
and lubricate the shaft seal (see also Page
6 of this manual).
In addition to the servicing instructions
given in the YANMAR manual, the shaft
arrangement must also be re-aligned after
20 hours’ operation. Chapter 3, “Installation
of the engine” describes how this is done.
The last section in the YANMAR operating
instructions, deals with the centring of the
propeller shaft after 50 hours. This point is
often forgotten. The procedure for checking
this is simple: undo the coupling flange and
check the clearance with a feeler gauge.
The flange should not be more than 3/10
out of alignment. The heavy Centraflex
shaft coupling is not held by the VOLVO
shaft seal and must be supported
accordingly. Take up sufficient thread on
the stay bolts of the rear engine bearers to
raise the rear of the engine, which usually
sags, back up again. (see diagram in Fig.
33)
Careful alignment of the engine installation
will keep noise level to a minimum.
The zinc anode on the propeller shaft is a
wasting component and should be replaced
once a year. It should be fitted so as to
ensure good electrical connection between
the shaft and the inside surface of the
anode.
In the Mediterranean, it has proved
expedient to paint the propeller shaft and
folding propeller with toxic paint. Under no
circumstances paint the zinc anode, as this
will impair its effectiveness.
Folding Propeller
Folding Propellers have to be serviced
annually, the double socket head cap
screws inspected to ensure they are
secure, and the propeller greased. This job
is best done during winter lay up.
Included in the technical documentation
supplied with the boat is an illustrated
servicing sheet provided by the
manufacturer.
Fig. 33 Centring of the propeller shaft
1. VOLVO shaft seal
2. Propeller shaft
3. Chock
4. Engine Bearer with adjusting bolt
5. Shaft coupling
6. Engine Bed
7. Engine
The zinc anode should be sanded
back to bright metal or replaced, if
ever the boat is hauled out for repairs
32
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