Plate 24
Stern Bearing and Propeller
A) Intake Scoop - Water to Water lubricated
Stern
Bearing
B) Bottom End of Rudder Stock with Bearing
1) Engine and propulsion system
a) General
As standard, the FJORD MS 33 is fitted with a
PERKINS engine of the type 4.108 (earlier type
4.107), with the governor adjusted to give an engine
output power of 37 shaft horsepower at 3000
revolutions per minute. (When rated to give maxi-
mum power for intermittent work, the figures is 47
S.H.P. at 3600 R.P.M. for the same engine) The 37
SHP-rating is a heavy duty workboat rating, which
implies that the engine can be run at 3000
R.P.M. continuously - for days.
The engine drives through a TMP hydraulic gearbox
of gear ratio 3 : 1, which indicates that maximum
propeller revolutions are as low as 1000 R.P.M. The
gearbox changes the direction of rotation, and
although the engine is turning counter-clockwise
when looking from the stern, the propeller is turning
clockwise when going ahead.
Instructions for how to operate the engine are given
in paragraph 3.6.
The engine is flexibly mounted on rubber vibration
dampers to reduce the structure-transmitted noise to
a minimum, and the 1 1/2” diameter stainless steel
propeller shaft is led through the stern in a flexible
stuffing box and bearing.
Plate 22 shows the engine compartment below the
dog-house sole, with both hatches removed. Although
the space is not excessive, all vital details are easily
accessible for service and maintenance.
b) Stern tube
The stuffing box fitted to the stern tube is a standard
MQRSE flexible stuffing box connected to the tube
itself by a heavy duty rubber hose. The stuffmg box is
shown in plate 23.
It must be noted that the packing, which is forced
against the shaft by the beveled gland of the adjusting
nut to keep water from penetrating, is itself water
lubricated. Consequently, small
amounts of water must be allowed to occasionally drip
into the hull, and the nut MUST NOT be over
tightened in an attempt to avoid this leakage.
When tightening the nut, turn clockwise until it
becomes stiff, then slacken again by turning counter-
clockwise one turn, and lock the nut by
means of the looking pin.
The stern bearing is fitted outside the stern. A water
lubricated rubber bearing (cutless bearing) is provided,
ensuring trouble-free use for years.
(Plate 24).
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