Engine Overheating; Replacing The Engine Thermostat; 5.7L Engines (Raw Water Cooled) - Volvo 5.0OSiE-J Operator's Manual

Maintenance
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Engine Overheating

If the engine overheats at high engine speeds, the en-
gine protection mode feature will activate and:
•
Engine speed will be automatically reduced to
approximately 2500 RPM. The engine will not
operate above 2500 RPM. If an engine overheat
alarm has been installed, an audible warning
horn will sound.
•
The engine protection mode feature will remain
active until the engine has been reduced to idle
speed and the overheating problem is corrected.
For additional information, see Engine Protec-
tion Mode on page 26.
NOTICE! Do not remove the thermostat from the en-
gine as the engine is likely to overheat.
While Volvo Penta provides an audible alarm with eve-
ry engine, its installation is determined by the manu-
facturer of your boat. If your boat does not have an
audible alarm available, we strongly recommend that
you contact your dealer to have one installed.

Replacing the Engine Thermostat

5.0–5.7L Engines (Raw Water Cooled)
1. Loosen and remove long bolt 1; save for reuse.
2. Place lifting eye 2 in a secure location; you will
need to reattach it later.
3. Loosen and remove short bolt 3; save for reuse.
4. Remove thermostat housing 4.
5. Remove thermostat 5, O-ring 6, and gasket 7
from intake manifold 8. Discard gasket and ther-
mostat. Inspect O-ring and, if damaged, replace.
6. Clean intake manifold and 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 in-
take manifold. Place a rag in the intake
manifold to keep debris out; remove when
cleaning is completed.
7. Place new gasket, new thermostat, and the
O-ring into the groove in the intake manifold.
8. Replace thermostat housing.
9. Install bolts and lifting eye.
10. Torque bolts to18–30 ft. lb. (25–41 Nm).
VPA 7748131 English 09-2007