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205
COOLING SYSTEM
OPERATION
10
When the thermostat opens, water flows down
through the cylinder head to a passage in the cyl-
inder block. Water flows through the block to the
exhaust housing and then out of the outboard.
At higher speeds
, water pressure opens the
pressure relief valve at approximately 1800 RPM.
Water flows through the valve and bypasses the
thermostats. Hoses route the water flow from the
pressure valve to the vertical water passages
below the thermostats. All water flows through the
cylinder heads to the outlet passages of the block
and then exits through the adapter housing.
This pressure controlled water outlet circuit pro-
vides a “high flow” discharge of water during high
speed operation.
This cooling system configuration provides “bal-
anced cooling” at higher RPM by using one pres-
sure valve to control the discharge of water
through both cylinder heads.
Additional Cooling
Two external water supply hoses direct water flow
into the exhaust (plenum) area of the cylinder
block. The water reduces exhaust runner temper-
atures and circulates through the cylinder block.
The base gasket limits water flow to the base of
the block and diverts water flow to the rear port
and rear starboard fittings of the adapter housing.
EMM
and Vapor Separator
Cooling
Cooling water is routed from the top of the cylinder
block to the inlet fitting of the
EMM
water cavity.
Cooling of the
EMM
helps to stabilize the temper-
atures of internal components.
IMPORTANT:
Improper
EMM
cooling will acti-
vate service codes 25 and 29 and the Engine
Monitor warning system. Refer to the
EMM
Ser-
vice Code Chart
at the back of this manual for
specific service code information.
Cooling water from the
EMM
is routed to the water
inlet fitting of the vapor separator water cavity.
Cooling the vapor separator fuel chamber mini-
mizes fuel vaporization.
Cooling water from the vapor separator is routed
to the adapter/exhaust housing.
1.
External water supply hoses
2.
Exhaust (plenum)
000698r
2
1
1
Содержание E250DHLSCS
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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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