17
COOLING SYSTEM
The engine has a raw-water direct cooling system fed by an impeller type pump located
on the front of the engine and driven by the crankshaft. The water is circulated through
the cylinder block and cylinder head jackets and finally discarded via a thermostat
controlled outlet into the exhaust manifold.
Pump impeller change – is possible when the pump housing front cover is removed. Pry
the impeller off its shaft using two scredrivers. Lubricate the shaft and the impeller vanes
with a few drops of oil prior to installation. Bend the vanes opposite to the direction of
rotation in order to avoid distortion. Renew the pump housing gasket and install the
cover.
NOTE – the impeller should be removed prior to lay-up – see instructions on page 21
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