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204
COOLING SYSTEM
OPERATION
Overcooling:
Debris may prevent the valve from
closing completely.
Thermostats
Thermostats control water flow and operating
temperature at lower speeds (below 1800 RPM).
Overheating:
A restricted or faulty thermostat typ-
ically results in LOW SPEED overheating.
Overcooling:
Debris may prevent the thermostat
from closing completely.
Block Venting
A fitting and hose from the top of the block allows
the constant movement of water and/or air from
the block. Circulated water flows through the
EMM
and Vapor Separator before exiting through the
overboard indicator.
OPERATION
All models use a two-stage cooling system
design. The cooling system is dependent on water
pump pressure and controlled by thermostat and
pressure valve operation.
IMPORTANT:
Restricted or inadequate water
flow through the outboard reduces cooling system
performance and may lead to severe powerhead
damage.
Cylinder Block / Cylinder Head
Cooling
The flow of water through the cylinder block and
cylinder heads is controlled by two thermostats
and one external pressure valve. The pressure
valve is connected by hoses to the top of each cyl-
inder head.
The thermostats and pressure valve control the
flow of water entering the vertical water passages
of the cylinder heads.
At low speed
, the pressure valve is against the
seat and the thermostats are closed. Warm water
from the cylinder block gradually migrates to the
thermostat pocket at the top of each cylinder
head.
The thermostat opens when the water tempera-
ture reaches approximately 143°F (62°C).
Pressure Relief Valve Components
DRC8113
Thermostat
DSC02335
1.
Thermostats
2.
Pressure valve assembly
004269
1
2
1
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Страница 186: ...184 FUEL SYSTEM NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 191: ...OILING SYSTEM OIL SUPPLY DIAGRAMS V6 189 9 006870 Rear View 6 4 5 3 Top View 1 2...
Страница 192: ...190 OILING SYSTEM OIL RECIRCULATION DIAGRAMS V6 OIL RECIRCULATION DIAGRAMS V6 004111a 2 4 6 1 3 5...
Страница 212: ...210 COOLING SYSTEM NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 216: ...214 POWERHEAD SERVICE CHART Taper Pin Tool Hole for Storage Scale FULL SIZE...
Страница 242: ...240 POWERHEAD POWERHEAD VIEWS POWERHEAD VIEWS Port Hose Routings 006972...
Страница 243: ...POWERHEAD POWERHEAD VIEWS 241 11 Starboard Hose Routings 006952...
Страница 244: ...242 POWERHEAD POWERHEAD VIEWS Port 006993...
Страница 245: ...POWERHEAD POWERHEAD VIEWS 243 11 Starboard 006973...
Страница 246: ...244 POWERHEAD POWERHEAD VIEWS Front 006974...
Страница 247: ...POWERHEAD POWERHEAD VIEWS 245 11 Rear 006975...
Страница 248: ...246 POWERHEAD POWERHEAD VIEWS Top 006957...
Страница 252: ...250 MIDSECTION SERVICE CHART 004117...
Страница 314: ...312 GEARCASE COUNTER ROTATION NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 346: ...344 TRIM AND TILT NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
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Страница 387: ...A B C 5 1 2 3 6 4 5 1 2 3 6 4 5 1 2 3 6 4 DRC6165R MWS Instrument Wiring Harness 1 2 5 1 2 3 6 7 4 8 A B C...
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