CARBURETOR MODEL M 4M E /M 4M C
6C4-1
SECTION 6C4
CARBURETOR MODEL M 4 M E /M 4 M C
CONTENTS
C l e a n i n g ............................................................................................. 6 C 4 - 1 4
A s s e m b l y ........................................................................................... 6 C 4 - 1 5
U n i t R e p a i r A d j u s t m e n t s ....................................................... 6 C 4 - 1 7
A d j u s t m e n t S p e c i f i c a t i o n s ........................................................ 6 C 4 - 2 6
GENERAL DESCRIPTION
r o d s ,
A h o t a i r c h o k e m o d e l M 4 M C c a r b u r e t o r is u s e d o n a
H e a v y D u t y E m i s s i o n s v e h i c l e . A e l e c t r i c c h o k e m o d e l
M 4 M E c a r b u r e t o r is u s e d o n a L i g h t D u t y E m i s s i o n s
v e h i c l e .
E a c h o f t h e s e c a r b u r e t o r s is a 4 - b a r r e l , t w o - s t a g e
d e s i g n . A t r i p l e v e n t u r i w i t h p l a i n t u b e n o z z l e is u s e d in e a c h
p r i m a r y b o r e r e s u l t i n g in p r e c i s e f u e l m e t e r i n g c o n t r o l
d u r i n g t h e o f f - i d l e a n d p a r t t h r o t t l e r a n g e s o f e n g i n e
o p e r a t i o n . T h e s e c o n d a r y s i d e h a s t w o l a r g e b o r e s w h i c h ,
a d d e d t o t h e p r i m a r y , g i v e s s u f f i c i e n t a i r c a p a c i t y t o m e e t
m o s t e n g i n e r e q u i r e m e n t s . A n a i r v a l v e is u s e d o n t h e
s e c o n d a r y s i d e f o r f u e l m e t e r i n g c o n t r o l .
T h e m a i n m e t e r i n g s y s t e m h a s s e p a r a t e m a i n f u e l w e l l s
w h i c h f e e d e a c h f u e l n o z z l e f o r g o o d f u e l flow t h r o u g h t h e
v e n t u r i .
D u r i n g o f f - i d l e a n d p a r t t h r o t t l e o p e r a t i o n , f u e l
m e t e r i n g is a c c o m p l i s h e d b y t w o t a p e r e d p r i m a r y m e t e r i n g
r o d s ,
o p e r a t i n g
in
m e t e r i n g j e t s ,
p o s i t i o n e d
b y
a
c o n v e n t i o n a l s p r i n g - l o a d e d p o w e r p i s t o n t h a t is r e s p o n s i v e
t o m a n i f o l d v a c u u m .
A d ju sta b le Part Throttle
A n a d j u s t a b l e p a r t t h r o t t l e ( A P T ) f e a t u r e is u s e d t o
p r o v i d e a c l o s e t o l e r a n c e a d j u s t m e n t in t h e m a i n m e t e r i n g
s y s t e m . T h e A P T a d j u s t m e n t v e r y a c c u r a t e l y s e t s t h e d e p t h
o f t h e m e t e r i n g r o d s in t h e p r i m a r y m e t e r i n g j e t s .
T h e a d j u s t m e n t f e a t u r e c o n s i s t s o f a p i n p r e s s e d in t h e
s i d e o f t h e p o w e r p i s t o n w h i c h e x t e n d s t h r o u g h a s l o t in t h e
s i d e o f t h e p i s t o n w e l l. W h e n t h e p o w e r p i s t o n is d o w n
( e c o n o m y p o s i t i o n ) , t h e s i d e o f t h e p i n s t o p s o n t o p o f a f l a t
s u r f a c e o n t h e a d j u s t m e n t s c r e w l o c a t e d in t h e c a v i t y n e x t t o
t h e p o w e r p i s t o n . T h e a d j u s t m e n t s c r e w is h e l d f r o m t u r n i n g
b y a t e n s i o n s p r i n g b e n e a t h t h e h e a d o f t h e a d j u s t m e n t
s c r e w . D u r i n g p r o d u c t i o n flow t e s t , t h i s a d j u s t m e n t s c r e w is
t u r n e d u p o r d o w n w h i c h , in t u r n , r a i s e s o r l o w e r s t h e p o w e r
p i s t o n a n d m e t e r i n g r o d a s s e m b l y . T h i s v e r y a c c u r a t e l y
c o n t r o l s t h e f u e l flow b e t w e e n t h e r o d s a n d j e t s t o m e e t
e m i s s i o n r e q u i r e m e n t s .
N o a t t e m p t s h o u l d b e m a d e t o c h a n g e t h e A P T
a d j u s t m e n t . I f f l o a t b o w l r e p l a c e m e n t is r e q u i r e d , t h e n e w
b o w l a s s e m b l y w ill i n c l u d e a n a d j u s t m e n t s c r e w p r e - s e t b y
t h e f a c t o r y .
C a rb u re to r O p e ra tio n
T h e c a r b u r e t o r s M 4 M E / M 4 M C h a v e s i x b a s i c
s y s t e m s . T h e y a r e f l o a t , i d le , m a i n m e t e r i n g , p o w e r , p u m p ,
a n d c h o k e ( F i g s . 6 C 4 - 2 a n d 6 C 4 - 3 ) .
Summary of Contents for 1982 Light Duty Truck
Page 1: ......
Page 28: ...HEATER 1A 3 Fig lA 2 Heater Control C K Models Fig lA 3 Heater Control G Models...
Page 37: ...Fig 1A 11 T E E V A L V E A S M TEE AND VALVE C36...
Page 38: ...HEATER 1A 13 Fig 1A l2 Distributor Ducts G Models Fig 1A l5 Control Assembly G Models...
Page 39: ...1A 14 HEATER V IE W A V IE W B Fig 1A l7 Control Cable Routing G Models...
Page 42: ...HEATER 1A 19 Fig 1A 23 Auxiliary Heater Hose Routing...
Page 56: ...AIR CONDITIONING IB 13 Chart 1B 4 Pressure Cycling CCOT System Diagnosis...
Page 64: ...Fig 1B 17 C60 System Vacuum Diagram C K Series...
Page 65: ......
Page 66: ...Fig 1B 19 C60 Motor Home Chassis Wiring Diagram SWITCH AIR CONDITIONING IB 2 3...
Page 67: ...IB 24 AIR CONDITIONING Fig IB 20 1 P A C Harness Wiring...
Page 68: ...AIR CONDITIONING IB 25 VIE W A Fig IB 21 A C Compressor wiring...
Page 76: ...AIR CONDITIONING IB 33 Fig 1B 26 Compressor Mounting...
Page 91: ...IB 48 AIR CONDITIONING Fig 1B 59 C K Models Refrigerant Lines L6...
Page 150: ......
Page 162: ......
Page 164: ...2D 2 BODY Fig 2D 4 Typical Utility Vehicle Model...
Page 182: ...2D 20 BODY Fig 2D 51 Rear Door Controls Fig 2D 52 Rear Door Outside Handle and Lock Cylinder...
Page 193: ...BODY 2D 31 BELTS 3RD SEAT Fig 2D 82 Seat Belt Installation Suburban Driver Seat Suburban...
Page 194: ...2D 32 BODY Fig 2D 85 Passenger s Bucket Seat Chassis Cab...
Page 195: ...BODY 2D 33 Fig 2D 88 Rear Bench Seats Suburban...
Page 196: ...2D 34 BODY Fig 2D 89 CK Utility Seat Attachments...
Page 197: ...BODY 2D 35 Fig 2D 90 Seat Separator Compartment and Door CK Models...
Page 222: ......
Page 223: ...BODY 2D 61 Fig 2D 139 Front Seat Belt Installation...
Page 228: ......
Page 234: ......
Page 252: ...3B2 8 MANUAL STEERING GEAR Fig 3B2 11 Manual Steering Gear Exploded View...
Page 256: ......
Page 273: ...POWER STEERING SYSTEM 3B3 17 with LE3 Engine Exc HC4 LE4 LG9 LF4 LS9 LT9 and JB7 HC4 and JB8...
Page 342: ......
Page 389: ...REAR SUSPENSION 3D 7 Fig 3D 17 Rear Spring Installation C K Models...
Page 428: ...4 B 1 4 REAR AXLE Fig 4B 8 Gear Tooth Nomenclature Fig 4B 9 G ear Tooth Contact Pattern Check...
Page 444: ......
Page 454: ......
Page 468: ...4 B 5 2 REAR AXLE Fig 4B5 2 Rockwell Assembly...
Page 480: ...4 B 5 1 4 REAR AXLE...
Page 482: ...i...
Page 502: ......
Page 520: ......
Page 533: ...Fig 5 5 Front Brake Pipes and Hoses C K Models BRAKES 5 13...
Page 534: ...Fig 5 6 Front Brake Pipes and Hoses G M odels 5 14 B R A K E S...
Page 535: ...Fig 5 7 Front Brake Pipes and Hoses P Models BRAKES 5 15...
Page 536: ...5 16 BRAKES Fig 5 8 Rear Brake Hoses...
Page 538: ...5 18 BRAKES Fig 5 10 Parking Brake System Typical...
Page 539: ...BRAKES 5 19...
Page 570: ...5 50 BRAKES Fig 5 57 Power Steering Hose Routing C K Models...
Page 571: ...BRAKES 5 51 Fig 5 58 Power Steering Hose Routing G Models...
Page 572: ...Fig 5 59 Power Steering H ose Routing P Models 5 52 BRAKES...
Page 577: ...BRAKES 5 57 4 CONT A SECONDARY DIAPHRAGM B SECONDARY POWER 4 CONT C PRIMARY D Fig 5 5A Service...
Page 604: ......
Page 625: ...NOTES ENGINE 6 21...
Page 626: ......
Page 629: ...IN LINE 6 6A1 3 OIL PRESSURE SENDING UNIT Fig 6A1 1 In Line Engine Lubrication...
Page 630: ...6A1 4 IN LINE 6 Fig 6 A l 2 P Series Engine Front Mount...
Page 631: ...IN LINE 6 6A1 5 Fig 6Al 3 P Series Engine Rear Mount Fig 6 A l 4 C Series Engine Rear Mounts...
Page 634: ...6A1 8 IN LINE 6 Fig 6Al 7 K Series Engine Rear Mount...
Page 660: ......
Page 663: ...SMALL BLOCK 6A4 3 Fig 6A4 T Engine Lubrication...
Page 664: ...6A4 4 SMALL BLOCK Fig 6A4 2 Engine Lubrication...
Page 665: ...Fig 6A4 3 P Series Engine Mount Bracket...
Page 667: ...SMALL BLOCK 6A4 7 Fig 6A 4 5 P Series Engine Front Mount...
Page 668: ...6A4 8 SMALL BLOCK...
Page 669: ...SMALL BLOCK 6A4 9 Fig 6A 4 7 K Series Engine Mounts...
Page 670: ...6A4 10 SMALL BLOCK Fig 6A 4 8 C Series Engine Mounts...
Page 703: ...MARK IV 6A5 7 Fig 6A 5 6 P Series Engine Front Mount...
Page 704: ...6A5 8 MARK IV Fig 6 A 5 7 C Series Engine Mounts...
Page 731: ...6 2 DIESEL 6A7 3...
Page 760: ...6B 6 ENGINE COOLING Fig 6B 7 A C and A I R Adjustment...
Page 771: ...ENGINE COOLING 6B 17 Fig 6B 20 Engine O il C o o le r 6 2L Diesel...
Page 784: ......
Page 807: ...CARBURETOR MODEL 2SE 6C2 9 Fig 6C2 6 Typical 2SE Carburetor Assembly...
Page 820: ......
Page 830: ...6C4 10 CARBURETOR MODEL M4ME M4MC 101368 Fig 6C4 12 M 4M C M 4M E Carburetor Exploded View...
Page 848: ......
Page 876: ......
Page 888: ...6D 12 ENGINE ELECTRICAL Fig 6D 6C Generator Mounting Fig 6D 7C Generator Mounting...
Page 919: ...ENGINE ELECTRICAL 6D 43...
Page 934: ...Fig 6D 8E Starter M otor Mounting...
Page 974: ......
Page 1011: ...Figure 350C 25A Neutral Engine Running AUTOMATIC TRANSMISSION 350C 11...
Page 1054: ...Fig 7A 1C 400 Autom atic Transmission Side Cross Section Typical...
Page 1152: ...700 R4 40 AUTOMATIC TRANSMISSION Figure 700 R4 76 Transmission Assembly Exploded View...
Page 1162: ......
Page 1189: ...89MM MANUAL TRANSMISSION 7B3 5 Fig 7 3 4 4 Speed 89mm Exploded View...
Page 1219: ...CLUTCH 7C 5 Fig 7C 6 C K Truck Clutch Controls...
Page 1220: ...Fig 7C 7 G Truck Clutch Controls...
Page 1221: ...CLUTCH 7C 7 Fig 7C 8 P Truck Clutch Controls...
Page 1234: ...7E 2 TRANSFER CASE Fig 7E 1 Model 208 Transfer Case Cross Section...
Page 1252: ...7E 20 TRANSFER CASE Fig 7E 39 Transfer Case Attachment Typical...
Page 1278: ...8A 16 ELECTRICAL BODY AND CHASSIS Fig 8A 11 License Plate Lamps C K Series...
Page 1280: ...8A 18 ELECTRICAL BODY AND CHASSIS VIEW A VIEW B Fig 8A 15 CK Series Rear Lamp W iring...
Page 1281: ...ELECTRICAL BODY AND CHASSIS 8A 19 Fig 8A 16 CK Series Auxiliary W iring...
Page 1290: ...8B 8 ELECTRICAL AND WIRING Fig 8B 13 Seat Belt Reminder System Schematic...
Page 1292: ......
Page 1346: ...8C 54 INSTRUMENT PANEL AND GAGES Fig 8C 46 CK Series W iring 3 of 29...
Page 1351: ...INSTRUMENT PANEL AND GAGES 8C 59 SUBURBAN Fig 8C 51 CK Series W iring 8 of 29...
Page 1364: ...8C 72 INSTRUMENT PANEL AND GAGES Fig 8C 64 CK Series W iring 21 of 29...
Page 1365: ...INSTRUMENT PANEL AND GAGES 8C 73 CAB CRFW CAB CHASSIS Fig 8C 65 CK Series W iring 22 of 29...
Page 1366: ...8C 74 INSTRUMENT PANEL AND GAGES Fig 8C 66 CK Series W iring 23 of 29...
Page 1374: ...8C 82 INSTRUMENT PANEL AND GAGES Fig 8C 74 G Series W iring 2 of 19...
Page 1375: ...INSTRUMENT PANEL AND GAGES 8C 83 Fig 8C 75 G Series W iring 3 of 19...
Page 1376: ...8C 84 INSTRUMENT PANEL AND GAGES Fig 8C 76 G Series W iring 4 of 19...
Page 1379: ...INSTRUMENT PANEL AND GAGES 8C 87 Fig 8C 79 G Series W iring 7 of 19...
Page 1383: ...INSTRUMENT PANEL AND GAGES 8C 91 Fig 8C 83 G Series W iring 11 o f 19...
Page 1384: ...8C 92 INSTRUMENT PANEL AND GAGES BUS BARGWO Fig 8C 84 G Series W iring 12 of 19...
Page 1390: ...8C 98 INSTRUMENT PANEL AND GAGES Fig 8C 90 G Series W iring 18 of 19...
Page 1391: ...INSTRUMENT PANEL AND GAGES 8C 99 Fig 8C 91 G Series W iring 19 of 19...
Page 1392: ...8C 100 INSTRUMENT PANEL AND GAGES Fig 8C 92 P Series W iring 1 of 11...
Page 1393: ...INSTRUMENT PANEL AND GAGES 8C 101 Fig 8C 93 P Series W iring 2 of 11...
Page 1396: ...8C 104 INSTRUMENT PANEL AND GAGES Fig 8C 96 P Series W iring 5 of 11...
Page 1399: ...INSTRUMENT PANEL AND GAGES 8C 107 Fig 8C 99 P Series W iring 8 of 11...
Page 1401: ...INSTRUMENT PANEL AND GAGES 8C 109 START RUN OF LOCK ACC Fig 8C 101 P Series W iring 10 of 11...
Page 1415: ...ACCESSORIES 9 13 RADIO NOISE BLOWER MOTOR Fig 9 6R Radio Diagnosis Chart B...
Page 1416: ...9 14 ACCESSORIES D E A D R A D IO A M R A D IO I Fig 9 7R Radio Diagnosis Chart C...
Page 1417: ...ACCESSORIES 9 15 DEAD RADIO AM FM RADIO Fig 9 8R Radio Diagnosis Chart D...
Page 1435: ...t f l i t 1...