Perkins M85T - Preparations for an engine start; Perkins companies

Chapter 5 TPD 1399E
Page 16
Keel cooling system
The M65 and M85T may be purchased in a form
suitable for keel cooling. The engine connections
provided for the cooler are to suit 32mm outside
diameter rigid pipe, as shown in (A) and (B). The
connection for the ow to the keel cooler is shown at
(B1) and the return at (A1). The design data for the
keel cooler is shown in the table below.
M65 M85T
Heat rejection
at rated power
40 kW (2300
Btu/min)
51kW (2908
Btu/min)
Design value for
the temperature
of the water
returning from
the keel cooler.
60
O
C 60
O
C
Design value
for the water
ow through the
keel cooler.
90 litres/min (20
imp galls/min)
90 litres/min (20
imp galls/min)
The pipework between the engine and the cooler
should be as short and direct as is possible, but
should be sufciently exible to allow the engine to
move on its anti-vibration mounts.
The pipe layout should discourage the formation of air
locks, and venting points should be provided wherever
an air lock is likely to occur.
The keel cooling system should normally be lled
with a water/anti freeze mixture containing 50%
antifreeze, to ensure that the inhibitors included in the
antifreeze are present at a sufcient level to minimise
corrosion.
Note: The illustrations show the connections on the
M65, but are the same on the M85T.