4 If the engine has been run hard for a long period, let it idle for a few minutes
before switching off. This is sometimes known as
'Turbo
Run
Down'.
In all
engines, it will avoid the
risk
of
'After
Boil',
a condition where the cooling system
temperature continues to rise because of lack of circulation. Overheating can
cause excessive bearing wear in the
turbocharger.
Stern
gear_____________________________
All yachts are fitted with a 'P' bracket type stern bearing. The strut is either pinned
through iroko hardwood blocks secured to the hull and glassed over, or bolted to a
reinforced
area to the hull. One securing bolt is electrically bonded to the sacrificial
anode for
cathodic
protection. A water lubricated
'Cutlass'
bearing supports the
stainless steel propeller shaft. The propeller shaft passes through a GRP stern tube
which is bonded to the hull. The tube is offset to enable the shaft to be withdrawn
without obstruction from the rudder.
Bronze fitting holding
gland packing Jubilee clips Backing plate Bolts
Gland packing /
CSM around tube
Rubboseal
Stainless steel shaft Reinforced rubber seal
housing gland bearing
and stern tude connections
GRP tube, gel coat seal
inside and out
'P'
Bracket with
Cutlass bearing
Typical stem gear installation
Cutlass bearing
All yachts use either 1" or
li/4"
cutlass bearings in the
'P'
bracket.
This type of water lubricated bearing is normally manufactured from neoprene or
polyurethane
and has a long life in clean water. High silt, sand and mud levels will
cause accelerated wear.
Page 4.8
Issue 3
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