Volvo Penta 4.3GL Instruction Book page 49

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Oil coolers
Remove the lower water hose from the oil cooler. If
cooler is mounted horizontally, remove either hose,
loosen mounting bolt, and tip open end of cooler
down to drain.
IMPORTANT Failure to completely drain the
cooling system will result in serious damage to
the engine, exhaust manifolds, pivot housing,
and drive unit when temperatures go below
freezing. To assure complete drainage, probe
all drain openings with a piece of wire to remo-
ve any blockage.
Impeller, checking/replacing
WARNING! If the engine is installed so that
the seawater pump is located under the water
line there is a risk of water penetration. Close
the seacock.
IMPORTANT! Always carry a spare impeller
on board.
3.0 models
Remove the hose clamps and hoses from pump.
Remove the cover (1) with gasket (2).
Inspect the impeller (3). If there are cracks or other
defects the impeller must be replaced.
Lubricate the pump housing and inside of the cover
with a little waterproof grease which is suitable for
rubber.
Reinstall the impeller. Install the cover together with
a new gasket. Install the hoses and hose clamps.
Open seacock.
4.3, 5.0 and 5.7 models
Remove the hose clamps and hoses from pump.
Remove the stationary bracket (1).
Remove the four scews and remove the housing (2).
Inspect the impeller (3). If there are cracks or other
defects the impeller must be replaced. Inspect the O-
ring (4) for nicks, cuts and wear. Replace as
necessary.
Lubricate the pump housing with a little waterproof
grease which is suitable for rubber.
Reinstall the impeller. Install the housing (2). Install
the hoses and hose clamps.
Mount the stationary bracket.
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