Liter Engines (Closed Cooling System); Engine Flush - Volvo 5.0OSiE-J Operator's Manual

Maintenance
NOTICE! When re-installing the blue cap on the fresh
water flush hose, tighten it by hand, then
tighten 1/4 turn using a wrench. If the cap is
too loose, air may be sucked in, causing the
engine to overheat, resulting in damage.
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8.1 Liter Engines (Closed Cooling System)

1. Loosen and remove bolts 1; save for reuse.
2. Remove upper thermostat housing 2.
3. Remove O-ring 3, thermostat 4, and gasket 5,
from lower thermostat housing 6. Discard gasket
and thermostat. Inspect O-ring and, if damaged,
replace.
4. Clean thermostat housing surfaces where the
gasket makes contact. Remove any remnants of
the old gasket.
NOTICE! Take care not to drop any debris into the
thermostat housings. Place rags in the
housings to keep debris out; remove when
cleaning is completed.
5. Place new gasket, new thermostat, and the O-
ring into the groove in the lower thermostat hous-
ing.
6. Replace upper thermostat housing.
7. Install bolts and torque to18–30 ft. lb.
(25–41 Nm).

Engine Flush

Volvo Penta engines incorporate an engine flushing
port designed to flush the engine with fresh water
while the engine is running. If flushing the engine with
the boat in the water, the engine should not be run
higher than idle or sea water may be drawn in with the
fresh water.
NOTICE! When flushing the engine with the boat in
the water, fresh water pressure must be
17 psi (117 kPa) or greater.
1. If the engine is running, shut it down.
2. Remove the blue plastic cap from the hose that is
clamped to the starboard side of the engine. It is
marked with the running engine flush symbol (1).
3. Connect a water hose from a fresh water source
to the flush connector on the engine (2).
4. Turn water on full and start the engine.
5. Let engine idle until engine temperature stabilizes
at its normal operating range. This will allow the
thermostat to open and ensure the fresh water
circulates throughout the engine.
6. After engine is flushed, shut engine the down.
7. Disconnect water hose and reinstall the cap.
Drain the engine if freezing temperatures are expect-
ed. For details on draining the engine, please refer to
the section entitled Draining the Cooling System on
page 81.
VPA 7748131 English 09-2007