8.1 Liter Engines (Raw Water Cooled)
50538
For instructions on replacing the engine thermostat on
closed cooling engines, please see the Do It Your-
self manual.
1. Loosen and remove long bolt 1, washer 2, and
short bolt 3; save for reuse.
2. Remove thermostat housing 4.
3. Remove thermostat 5, small O-ring 6, and large
O-ring 7, from cross-over pipe housing 8. Discard
thermostat. Inspect O-rings and, if damaged,
replace.
4. Place new thermostat and O-rings into the groove
in the cross-over pipe housing.
5. Replace upper thermostat housing.
6. Install bolts and washer and torque to
18–30 ft. lb. (25–41 Nm).
Impeller: Checking & Replacing
23675
NOTICE! If you have a seacock installed, close it now
to prevent any possible water intrusion.
NOTICE! Always carry a spare impeller on board.
1. Remove the hose clamps and hoses from pump.
2. Loosen the four screws 1 and remove the
housing 2.
3. Inspect the impeller 3. If there are cracks, signs
of burning or melting on the edges, or any other
visible defects, the impeller must be replaced.
Inspect the O-ring 4 for nicks, cuts, and wear.
Replace as necessary.
4. Lubricate the pump housing with non-petroleum
based lubricant, suitable for rubber, such as glyc-
erine. If you have purchased the Volvo Penta
impeller kit, a packet of glycerine is included.
5. Reinstall the impeller. Reinstall the housing.
Tighten bolts to 25-29 ft. lb. (33-39 Nm).
6. Install the hoses and hose clamps.
If you closed the seacock, be sure to reopen it before
restarting the engine.
Maintenance
47700385 05-2009 85
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