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 TM 5-2805-261-13
During the engine start and warm-up the thermostatic valve in
During the engine warm-up the shift lever is in the neutral
the cylinder head remains closed, preventing water displaced by
position. The shifter clutch dog remains centered between the
the water pump from entering the cooling channels in the
two bevel gears. The gears are constantly driven by the
cylinder block. Instead, the water is routed through the by-pass
driveshaft pinion gear and rotate freely on the propeller shaft.
channel and exits through the water outlet in the exhaust
When the shift lever is moved into the forward position, the
housing or the under water outlet in the gearcase. When the
fingers of the shifter lever move the clutch dog into engagement
powerhead temperature gets too hot, the thermostatic valve
with the forward gear. When the shift lever is in the reverse
opens and allows water to circulate through the cylinder block
position, the clutch dog is moved into engagement with the
channels.
reverse gear.
Figure 1-28. Gears arrangement
Figure 1-27. Cooling system
1-13
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