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D IA P H R A G M
COVER
V A C U U M TUBE C O N N E C T E D
T O T H E R M A L V A C U U M S W IT C H
V A L V E SH AFT
S E A L -
V A L V E S E A T,
V A LV E C H A M B E R
TO IN T A K E
m a n i f o l d
'
Fig. 6E-20-EGR Valve
valve assem bly acts as a pressure regulator. The control
valve receives an exhaust back pressure signal through
the hollow sh a ft w hich exerts a force on the bottom o f
the control valve d ia p h ra g m , opposed by a light spring.
A m etal deflector p late prevents hot exhaust gases from
flow ing directly on the d ia p h ra g m .
Vacuum is applied to the E G R valve assem bly from
the carb u reto r spark port, to assure no exhaust gas
recirculation at idle. D u rin g off-idle op eratio n , m anifold
vacuum is applied to the vacuum ch am b er through a
restriction in the signal tube. W hen engine load is light,
an d back pressure is low, the control valve is open,
allow ing air to flow from the 6 bleeds in the d ia p h ra g m
plate, through the control valve orifice, into the vacuum
cham b er. The a ir bleeds off vacuum , decreasing the
signal trying to open the E G R valve. T h erefo re, if back
pressure does not close the control valve, sealing off the
a ir flow, there will n o t be any vacuum built up to open
the E G R valve fo r exhaust gas recirculation.
W hen pow er dem an d s are m ade on the engine, and
exhaust gas recirculation is needed, exhaust back
pressure increases, closing the control valve, thereby
sh utting off air flow th rough the valve. V acuum builds up
in the vacuum ch a m b e r until the spring force holding
the E G R valve closed is overcom e.
Once the E G R valve opens, the exhaust pressure
decreases because som e o f the exhaust gas is flowing into
the intake m anifold th rough the E G R passage. In actual
o p eratio n , the system will reach a balanced condition
providing optim um E G R o peration.
A ny increase in engine load will m om entarily
increase the exhaust signal, causing the control valve to
AIR
FLOW
IN
DIAPHRAGM
D EFLEC TO R
F IL T E R
SCREEN
CONTROL V A LVE
OPEN
SPRING
SPRING
(CONTROL
VA LVE)
VACUUM
CHAMBER
R ESTRICTIO N
T IM E D
M AN IFO LD
VACUUM
CONTROL V A L V E
CLOSED
TO
VACUUM
SOURCE
FIGURE 1
FIGURE 2
H
I EXHAUST GAS
EXHAUST
GAS (IN)
EXHAUST GAS TO
INTAKE M AN IFO LD
Содержание 1977 light duty truck
Страница 1: ......
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Страница 70: ...Fig IB 24 Four Season System Vacuum Diagram C K Models 1B 24 LIGHT TRUCK SERVICE M A N U A L...
Страница 71: ...Fig lB 25 Overhead System Wiring Diagram C K Models AIR C O N D ITIO N IN G 1 B 2 5...
Страница 72: ...Fig IB 26 C60 System Wiring Diagram G Models...
Страница 74: ......
Страница 75: ...Fig lB 29 Motor Home Chassis Wiring Diagram THERMOSTATIC SWITCH AIR C O N D ITIO N IN G IB 2 9...
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Страница 129: ...Fig 2D 5 Typical 05 and 0 6 Vans...
Страница 136: ......
Страница 148: ...Fig 2D 51 Rear Door Controls...
Страница 158: ...Fig 2D 79 Folding Top Assembly...
Страница 159: ...Fig 2D 80 Folding Top Side Moldings and Header...
Страница 161: ...Fig 2D 85 Dnver s Bucket Seat 14 Fig 2D 86 Passenger s Bucket Seat 14...
Страница 162: ...Fig 2D 89 Rear Folding Seat 06 Fig 2D 9 0 Rear Bench Seat 14...
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Страница 248: ...Fig 3B 77 Removing Bearing Housing Pivot Pins Fig 3B 79 Replacing Lock Bolt Spring...
Страница 278: ...C 10 G 10 20 C 20 30 G 30 P 10 30 9 Fig 3C l Front Suspension C P Series...
Страница 284: ...BALL JOINT DIAGNOSTIC PROCEDURE...
Страница 316: ......
Страница 321: ...Fig 3D 12 Rear Spring Installation G Models...
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Страница 395: ...Fig 5 2 Front Brake Pipes and Hoses C K Models...
Страница 396: ......
Страница 397: ...Fig 5 4 Front Brake Pipes and Hoses P Models BRAKES 5 1 3...
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Страница 401: ...V 8 N 4 0 L 6 N 4 0...
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Страница 403: ...fryIvtcwfA POOO 4 2 MODELS lVIEW C K MODELS P 3 0 0 3 2 MODELS G MODELS Fig 5 9 Parking Brake Assembly Typical...
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Страница 405: ...P300 42 M40 JB9...
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Страница 448: ...Fig 6A 4 P Series Engine Rear Mount...
Страница 451: ...Fig 6A 8 K Series Engine Rear Mount...
Страница 452: ...ENGINE M O U N T BRACKET ALL K SERIES W ITH L 6 ENGINE 6A14 LIGHT TRUCK SERVICE M A N U A L...
Страница 483: ...FUEL PUMP PUSH ROD OILING OIL F LTER AND BY PASS VALVE...
Страница 484: ...FUEL PUMP PUSH ROD OILING CRANKCASE AND CRANKSHAFT OILING VALVE MECHANISM OILING...
Страница 487: ......
Страница 488: ...MOUNT VIEW A V AUTOMATIC TRANSMISSION FRONT MANUAL TRANSMISSION...
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Страница 599: ...CARBON c 5 PILE L VOLTMETER f m s K K K V v D BATTERY RESISTOR TEST AMMETER s S S 5 S V GENERATOR D C...
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Страница 612: ...Fig 6D 3i High Energy Ignition Basic W iring...
Страница 644: ......
Страница 647: ...Fig 6E 1 Vacuum Hose Schematic L6 250 CID LD Emissions DISTRIBUTOR PCV VALVE MANIFOLD VAC FITTING...
Страница 648: ...DISTRIBUTOR VALVE Fig 6E 3 Vacuum Hose Schematic L6 292 CID Calif HD Emissions...
Страница 649: ...V A LV E Fig 6E 5 Vacuum Hose Schematic V8 305 CID HD Emissions...
Страница 650: ...Fig 6E 7 Vacuum Hose Schematic V8 350 CID High Altitude Calif LD Emissions...
Страница 651: ...VALVE Fig 6E 9 Vacuum Hose Schematic V8 350 400 CID Except Calif HD Emissions...
Страница 652: ...CANISTER...
Страница 653: ...PCV V AL VE Fig 6E 13 Vacuum Hose Schematic V8 454 CID Except Calif HD Emissions...
Страница 672: ...Fig 6E 29 Air Cleaner 305 350 400 V8 CK...
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Страница 691: ...SPECIAL TOOLS n 1 J 25077 1 Vibrator Include Catalyst Container and Fill Tube Extension 2 J 25077 2 Aspirator...
Страница 692: ......
Страница 700: ...Fig 7A 6B Detent Downshift Cable C K and P Series...
Страница 709: ...Fig 7 A 12B CBC 350 Hydraulic Circuit A U TO M A T IC T R A N S M IS S IO N 7 A 1 7...
Страница 743: ...VIEW B FLAT IvEwfDl l6 G tO 2 GAGE...
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Страница 755: ...V I E W B WITH AUTOMATIC TRANSMISSION WITH MANUAL TRANSMISSION V I E W A...
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Страница 767: ...V I E W D 1 6 ENGINE VIEW V 8 ENGINE...
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Страница 790: ...STOPLAMP SWITCH See Section 5 Brakes of this manual for adjustment and replacement procedures G MODELS...
Страница 794: ...G A S G A U G E...
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Страница 836: ...Fig 8 58 Seat Belt Reminder System Schematic...
Страница 844: ...C H E C K n...
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Страница 853: ...SPECIAL TOOLS J 2 3 5 2 0...