TPD1317e Chapter 5
Page 27
5.2 Keel Cooling Statement: M300Ti and M265Ti Engines - keel cooling is not
offered with these models.
5.3 Keel Cooling System: M225Ti, M215C and M185C Engines
All engine models may be purchased in a form suitable for keel cooling, using two separate coolers, one for
the cylinder jacket circuit and one for the intercooler circuit. Figure 2 shows the connections provided for the
coolers. The requirements for each section are as follows:
M215C/M225Ti M185C
Cylinder Jacket Circuit
Heat rejection.
132kW (7500 Btu/min) 123kW (7000 Btu/min)
Design value for the water temperature
at the exit from the keel cooler.
60
o
C (140
o
F) 60
o
C (140
o
F)
Design value for the water ow
through the cooler.
*Pipework to suit 45mm (1.75”) bore hose
connections.
77 l/min (17galls/min) 66 l/min (14.5galls/min)
Intercooler Circuit (Includes gearbox oil
cooler)
Heat rejection
25kW (1400 Btu/min) 19kW (1100 Btu/min)
Design value for the water temperature
at the exit from the cooler.
38
o
C (100
o
F) 38
o
C (100
o
F)
Design value for the water ow
through the cooler.
Pipework to suit 32mm (1.25”) bore hose
connections.
123 l/min (27galls/min) 109 l/min (24 galls/min)
Note: Under extreme conditions the water ow in the jacket circuit may increase to 40 gallons/min. Pipework
should have a clear bore of 38mm (1.5”)
The pipework between the engine and coolers should be as short and direct as is possible, but should be
sufciently exible to allow the engine to move on it’s exible mountings. The 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/antifreeze mixture containing 50% antifreeze.
This mixture is necessary even in warm climates, as the anti freeze contains corrosion inhibitors which protect
the engine cooling system.
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