Delco Carburetorc ADJUSTMENT PROCEDURES MODELS 4MV - 4MC - M4MC - M4ME NOTE: PERFORM ADJUSTMENTS IN PROPER SEQUENCE. PAGE: 1 REPLACES PAGE 1 APRIL 1979 ~'"cI FROM TOP or CASTING 10 TOP LOAT GAUG1NC PONNTI 16 BACX rnoos iioiir ~rrar srr INSET# YIS"4LL" cnrcr r,ori arlCNMrNr ASTER AI)I"STING ,~ - , , a', i 5 _-, I i - , ,- , , ~ , , ', I .--/ QUADRAJET AIR HORN SCREW TIGHTENING SEQUENCE FIG. 2 PUMP ROD HOLE LOCATION FIG. 3 - ROD IN SPECiFlED HOLE OF PUMP LEVER BENDlNG LEVER @THROTTLE vnLvEs COMPLETELY CLOSED NOTE MAKF SURE FAST (OLE BEND SECONDARY CLOSING T&NG AWAY TO CLOSE PRlMARY VALVES. THEN READJUST PUMP ADJUSTMENT FIG. 4 i . , GAUGEFROM TOP OFCHDXE VALYE WALL NEXTTO VENT STACI 70 TOP OF PUMP STEM 7" &OJ"ST >'OPEN PIIIMAR",".OTTLE TO A 10NTWIIERI OLE VENT ,"ST CLOSES -- - r'l L ' '1. IDLE VENT ADJUSTMENT FIG. 5 $1 (5, "'"'"ALVE ARM MUST CONTACT %I METAL STRIP nTTns PON, ,@ OP'"~~M~R"T"RO,,L. 70 A POINTWHERE ,OLE VENT VALVE AWM JUST CDN,AC,S B4 METAISTPIPilTYI\IYI IDLE VENT ADJUSTMENT (THERMOSTATIC TYPE) FIG. 6 - G A U C L i P O M TOP OF CHOKE VALVE WALL NEXTTO "EN, STACK 10 TOP OF PUMPSTEM ASSPEC~ED
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~ ' " c I F R O M TOP or CASTING 10 TOP LOAT G A U G 1 N C PONNTI 16 BACX
rnoos iioiir ~ r r a r s r r INSET#
YIS"4LL" cnrcr r ,or i arlCNMrNr ASTER AI)I"STING
,~ - , , a',
i 5 _-,
I i -
, ,- , , ~ , ,
',
I
.--/ QUADRAJET AIR HORN
SCREW TIGHTENING SEQUENCE FIG. 2
PUMP ROD HOLE LOCATION FIG. 3
-
ROD IN SPECiFlED HOLE OF PUMP LEVER
BENDlNG LEVER
@THROTTLE vnLvEs COMPLETELY CLOSED NOTE M A K F SURE FAST (OLE
BEND SECONDARY CLOSING T&NG AWAY TO CLOSE P R l M A R Y VALVES. THEN READJUST
PUMP ADJUSTMENT FIG. 4
i . , G A U G E F R O M TOP O F C H D X E VALYE WALL N E X T T O VENT S T A C I 7 0 TOP OF PUMP STEM
7" &OJ"ST
> ' O P E N PIIIMAR",".OTTLE TO A 1 0 N T W I I E R I O L E VENT ,"ST CLOSES
-- -
r ' l L ' '1.
IDLE VENT ADJUSTMENT FIG. 5
$1 (5, "'"'"ALVE A R M MUST
CONTACT %I M E T A L STRIP n T T n s PON,
,@ O P ' " ~ ~ M ~ R " T " R O , , L . 70 A POINTWHERE ,OLE VENT
V A L V E AWM JUST CDN,AC,S B4 M E T A I S T P I P i l T Y I \ I Y I
IDLE VENT ADJUSTMENT (THERMOSTATIC TYPE)
FIG. 6
- G A U C L i P O M TOP OF CHOKE VALVE W A L L N E X T T O "EN, STACK 10 TOP OF PUMPSTEM A S S P E C ~ E D
BULLETIN: 9D-5A RED SECTION DATE: MAY 1983 PAGE: 2
*,,* P L U C C A U C E , * I I , L , L t D S , l P 3 % 1"s
BOW, Y E W ( V ~ ~ ~ t r , :.A.E.o"s BOW, "EM, ".L"E ""0"'"" '"'"8'" """ ,F ........" 'o..,"I' R I M O " ' " " "
C0.S. A...C",N. sc..w ,bcLz",::::;Eo:":::"Lo A " o ' " R " "" %"'" RE""" """ COVER A W D G A S K S , A f T E R A D I Y I I U t W I
, I P t C , F L D L A ~ I T E B L i l l t N
, O L E < e r t O scnrw ,l.,, ",L , t v<s iTOP71I111
N"1G P6aconM .D,"S,MSW, W,," C I1M.OLIOWI . ,t"Er 2 . Yi,,* ,*137,L1 V . L Y , I C L o i c D i O M P L L l l l y
OF? STcmSoF Fa*, C , , * 8 1 0 ~ L U W IDLE I C s i i V Y Y I l l l i I C s t n
to te CAM,^,^^ O P E N l . N ~ ~ n l w s ~ r ~ ~ ~ ~ i ~ r i l I * ( ~ C"0"E POS#,>OM, TYRNii.m. S N I I 1 I Y R N I I BOWL VENT VALVE ADJUSTMENT
FIG. 7 I *
(I*c*rcn FAST IDLE
,WGTO s-Ec#F# ~p
,-, \~ , as, ,DLE SCBEW 1NTO CONTACT LEYE. O", "N,,, P R # M A R " , * I N TURN SCREW I N Tnse,TLl VALVES IIII CLOSED S P I C i i l * D NYMBEI I " 6 i U I i N I TO A D 1 U I T i S E E NOT61
FAST IDLE ADJUSTMENT (BENCH) FIG. 8
-
NOTE: IF TAYPEP..I1ESISTANT CHOKE (RIVETED) IS USEO. REYOYE CHOKE COVER ANOCOlLABLEMBLIFOLLOWINO INSTRUCTIONSINCHOKESTATCOVER RETAlNED KIT.
THERMOSTITJC COUNTERCLOCKWISE)
WER EOOE OF LEVER SHOULD T CONTACT SIDE OF PLUG
BERT LPEClFlED
OLOOSENTHRLERE~A~NINO SCREWSAND @PLACE CAM REMOVE THE THERMOSTATIC COYER AND COIIASSEUBLIFROMCHOIEHDUBlNG FOLLOWER ON HlGH STEP
(SEE NOTE,. OF FAST lDLE CAM.
CHOKE COIL LEVER ADJUSTMENT FIG. 9
L
Y Y I l Bi M A D L B i l O * L C ) 1 O " r .OJ" I,III N, i.0, . O J L I I I U t W T 11UhDt
CHOKE ROD (FAST AM) ADJUSTMENT
r?! Gh"Gt s trrer* iovra EOeE or C " 0 K t wa<vs*
17 BE.O.A.6
,WS, rnE ASP "OSW WALL ow Fa#, ,OLE C A W
WOTE "0LooA"Oe
P " S " # W G " P ~ " & ~ O ="OKs 'O,, LEVER
CHOKE, ROD (FAST IDLECAM) ADJUSTMENT FIG. 11
MUST BE MADE BEFORE CMOIE ROD P(IEJITF.iJTIDLEdCREW B 1
I O I U B T M E N T IS MADE a MIXING FAST IDLC hDIUITMINT
@ ~ ~ ~ ( : R I : ~ ~ ~ C O ~ L LEVER AND FAST IDLE ADJMTYENT (BENCH OR OWTHE.
NOTE: IF TAUPER.RLSISIAWT CHOKE (DIVEIEDJ S USED. DONOIREYOYEIIVET. ~ ~ ~ C * O * E C O Y ~ R T O P E R f O l Y ~HISADJUOIYENT. UY RUB~ER BANOO. "*CUUY B*EAK LLMR TANG 10 WDLO CHOKE YILYE C L O ~ D .
@TOADJUOT,IENDTANO
LlGHTLI CLOSE CWOKE BY PUSWINO UPWARD ON CHOKE COW LEVERORVACUUM BREAXLEIER TAN= @ R E M O V E @ ~ ~ ~ . . (HOLD IN PO9ITION WITI I RUBBER BINOJ.
CHOKE ROD (FAST IDLE CAM) RELATION ADJUSTMENT
FIG. 13B
Delco Carburetor BULLETIN: BD.SA RED SECTION
ADJUSTMENT PROCEDURES DATE: MAY 1983 PAGE: 3
MODELS 4MV - 4MC - M4MC - M4ME REPLACES PAGE 3 APRIL 1979 NOTE: PERFORM ADJUSTMENTS I N PROPER SEQUENCE.
0 8"- * e m 10 O B T l l U ?) r.rctrleoctrrarwcr sriw.r.
AIR VALVE ROD ADJUSTMENT FIG. 15
COMPLETELY CLOSED
BEND ROO FOR SPECIFIED CLEIRANCEBEWEEHROD AND END OF SLOT IN LEYEm
AIR VALVE ROD ADJUSTMENT - REAR
FIG. 16
BULLETIN: 9D.SA RED SECTION DATE: MAY 1983 PAGE: 4
D l U O l I I T l t T N A,* "OW" W.LL .*oLOlr" EOOt
l l r n R l P Y O Y T I l D l u IOYRCS
WITH CHOKE SPRING PICK-UP LOCATED I N TOP NOTCH. H O L Q THE CHOKE V A L V E TOWARD THE CLOSED POSITION. H O L D
VACUUM BREAK DIAPHRAGM STEM AGAINST ITS SEATSO VACUUM BREAK ROO IS AT T H E END OF S L O T THE DIMENSION BETWEEN THE LOWER EDGE OF CHOKE V A L V E A N D AIR HORN. A T CHOKE LEVER END.SHOUL0 BE AS SPECIFIED.
BEND VACUUM BREAK ROO T O ADJUST.
FRONT VACUUM BREAK ADJUSTMENT FIG. 17 -
- FRONT VACUUM BREAK ADJUSTMENT
FIG. 19 THE VACUUM BREAK ADJUSTMENT MUST BE MADE AS FOLLOWS: LOOSEN THREE RETAINING SCREWS AND RE- MOVE THERMOSTATIC COVER AN0 COIL ASSEMBLY.
STEP "A" WITH CHOKE VALVE CLOSED. AND CHOKE ROD I N BOTTOM OF THE SLOT IN THE UPPER CHOKE LEVER. ALIGN THE THERMOSTATIC SPRING PICK-UP TANG DIRECTLY OVER THE INDEX TAB ON THE INSIDE OF THE CHOKE HOUSING.
AFTER TANG IS ALIGNED, ADJUST VACUUM BREAK TANG TO SPECIFIED DIMENSION BETWEEN TANG AND VACUUM BREAK PIN.
STEP "6"
WITH VACUUM BREAK DIAPHRAGM SEATED. AND TANG AGAINST VACUUM BREAK PIN. THE DIMENSION BETWEEN WALL AND LOWER EDGE OF CHOKE VALVE SHOULD BE AS SPECIFIED. MAKE SURE CHOKE ROD IS IN BOTTOM OF SLOT IN CHOKE LEVER WHEN GAUGING. TURN SCREWON VACUUM BREAK COVER TO AOJUST.
INSTALL BAFFLE PLATE AND THERMOSTATIC COVER. ADJUSTCOVER TO SPECIFIED MARK ON CHOKE HOUSING.
3 OPE,, PR'M""""""""'"L"" A"" R07A,e VACUUM 8.E.K L l Y l s "NIlL T.NOOY LEVER II I O I U S T M S
CONTACT END 0' I P
nl l A O l U S T h l E n T T I N G
SPLIT CHOKE SPRING ADJUSTMENT FIG. 18
, ,*air r i * t * i 5 100 * ' " 'TOY
FRONT VACUUM BREAK ADJUSTMENT FIG. 19
BETWEE. A,. "0%. W.LL A N D LOWE* EDGE OF
Y A C U U N IOUIiCEl
ChM FOLLOWER
FRONTVACUUM BREAK ADJUSTMENT FIG. 20
W l S l U N T I L I O P EDCC OF C A M
Y I L Y E O 5 0 THATFA67 # O i l C A M IOLLOWeP CLEA*5 STEPS ON CAST ,OLE C A M
,Gh"G< BC?WCSM A89 "ORW *,A,, A h 0 LOWErn EDSE "F CHOKE \V&L$,E
2 - 0 ~ s ~ Pl8bMa.l i " . O l l l l "L,\,SS so ."A, F&,,
FRONTVACUUM BREAK ADJUSTMENT FIG. 22
C O " W , ~ ~ C ~ ~ " ~ " ~ ~ , S ~ " W , , ,
L2"........ -
.A,,,,". C,.,.",, 8, .,,,, ".. ,,,,.,,,,.. r'-- ~ ~ ' ~ ~ ~ " ."..,,.. r * L n n s " l h G h l "LUYGCD B Y I X N T S P R Y T Y A L ~ ' ~ B s " T " A ~ i A i ~ I D l S N O T T O DULL .ME Y l i i Y Y M YIA"" . l IOM ' o L E r ~ U i " L L o w i s CLsams
OFF , , s s r * , s,EP3ourh%, , O L E C A M
FRONTVACUUM BREAK ADJUSTMENT FIG. 23
a P,*CE G & " & E B E T % r t w , " K t " t " C t "i C M O X I
" A , \ , E L * D ,m,#<>c SbALL
S P a W r i , ,s t0 M u i r st COM
,,,,,,>,"E" ,>\ ACTtUN MA.( SURE " , < , , , C S , , I S 0 T H E D , A P " R & G M 0, c * , , ,Oh$ C A M PLUNCER 1 S I U L L " PE.,ED
FRONT VACUUM BREAK ADJUSTMENT FIG. 24
,i, '_I
i l l U T S B c w L e N A l R HORN W I L L LND UPPr* KO61 or CHOKE waive
FRONT VACUUM BREAK ADJUSTMENT FIG. 25
CAM FOLLOWERCLEARS STEPSON F&STlDLECLIM
- ~ -. ,,,, =I , ~
USiNG VACUUMSOURCE OUTSIDE
WISE UNTtLEND O F R O D 15 IN ENDOFSLOTIN LEVER
@mMove G w o s UNTlL BUBBLS IS CENTEREO
VACUUM BREAK ADJUSTMENT FIG. 25A
-
BULLETIN: 9D.5A RED SECTION DATE: MAY 1983 PAGE: 6
4: PLACI GAUGE BETWEEN urn LOOCOF C " 0 X E " A t V E *WD ,w3,mewALL OF A,% HOR*
2 : 5E.T DI.P".IOM "$LNG O",S,DE "AC""M %O"*CE
NOTE ON O E M " r $ l ? U e I MOOELS -LUG END COVER W,,H A P , E Z E OF W&S<\MG TAPE M * K , W G S U R E 7 0
FRONTVACUUM BREAK ADJUSTMENT FIG. 26
a Ul<S CHOKS CDlLLEYER &NO IASTITDLEaDIUSTYTNT (BENCH OR OW-THE.CAR S m l t 4 G I . NOTE: wr~uvkm.aras~r~r CHOXE (IIVEIEOI 16 USED DONOTREYOYERIVETS ANOCHOXECOYERTOPERFORYTHlDIDIUSTYEHT. u<i RUBBER BAND ON VACUUM BREAK LEVERTANG 10 HOLD CMDIE VALVE CLOSED (STEP B I.
LEVER OR VI ICUUYBREI I LEVER TANG
ENDCOYER WiTH PllCE O I V S O U A I I E MASKING
FRONTVACUUM BREAK ADJUSTMENT FIG. 26A
r
80Ta.F CHOKE LEV C o " ~ T E ~ C L O C X W 1 s
NOTE #* "SSD
COVER A N 0 FL
C L " I I 0 . C a w MUIT 8 E USED W " e l C o M I I 1 1 I I I N T THC o l n e " R A r M PLUnrrP I s r l N C $0 NO. 10 PULL , *c V A C U U M D & s " l l & S M O r i Ins SEA.
REAR VACUUM BREAK ADJUSTMENT FIG. 27
, v , c * a r r V A L V E \ ~ ' S"0"LO B E
08, LEVER T O W l i l D I
(9 ; ~ i . L A C ' C " M ' " L ' " w r a rrvra ow n,cnesr
BREAK O I I P H R I I n M US8NT - O F r L ~ T m i l caN OUTSiDL V A C U U M I O U . I C I
REAR VACUUM BREAK ADJUSTMENT FIG. 29
OSE~DIAPHRASM USlNOYACUUM SOUllCl.
O F V S O U & R f m P r . REMOV ADJUSTMENT
N0TE:IFUSED DONOTTURN
COIL LEVER OR VACUUM
B R E M UNIT.
IJCOYPIIESSET1LNDSEITEO. BUCIlNG CHOKE LINKUNTIL SPRING BUSBLIISC6NTEflSD
? MAKE CnDIL COl l LEVLm I N 0 FLIST IDLE ADJUSTMENT (BENCH OR ON-THE-CAR O PETTING).NOTE: IF TAMPER-REBIOTANTCHOIE (RIVETED) ISUSEII,DD NOT
REMOVE RIVETBAND CHO<E COVER TO PERFORM THIS hDJUSTMLNT. USE RUBBER B&NDONYACUUM BREAK LEVER TANGTO HOLDCHOKEVALVECLOSED.
REAR VACUUM BREAK ADJUSTMENT FIG. 29A
Delco Carburetor BULLETIN: OD-SA RED SECTION
ADJUSTMENT PROCEDURES DATE: MAY 1983 PAGE: 7
MODELS 4MV - 4MC - M4MC - M4ME REPLACES PAGE 7 NOTE: PERFORM ADJUSTMENTS IN PROPER SEQUENCE. APRIL 1979
I I
I UNLOADER ADJUSTMENT FIG. 30
UNLOADER ADJUSTMENT FIG. 31
I
UNLOADER ADJUSTMENT - Typical FIG. 33
ICENTERTDI @ HOLDPRIMARY THROTTLEVaIVEB WIDEOPEN.
@PUSH UPOR DOWN ON LEVERTOWARDS CLOSEDCHOKE.
F%?
UNLOADER ADJUSTMENT ITYPICALI
1 FIG. 33A
I
I @CLOSE CHOKE VALVE 81 PUSHING UP ONTINC ON VACUUM B W A K LEVEII(HOL0IN PD61110NWITH RUBBER BAND)
UNLOADER ADJUSTMENT UNLOADER ADJUSTMENT l n P r c m l
FIG. 32 FIG. 338
PAGE: 8 I
Nois FAST IDLE AND CMO" nilOD ADJUSTMENIS MUST 8 E M A B E F#R*T
I AIR VALVE LOCKOUT ADJUSTMENT FIG. 34 I
l n w l r ~ rocr rcarw LoorrwEaawa i2W,/* ~ I R V n l Y ~ C L D I i D T U R N A D l U I T l N C
SCREW SPEClclFO NUMBER O r TURNS AFlEr l
AIR VALVE SPRING ADJUSTMENT FIG. 35
I SECONDARY LOCKOUT ADJUSTMENT FIG. 36 I
I SECONDARY CLOSING ADJUSTMENT FIG. 37 1
FIG. 38 I
I h O T E O N BUCK MODELS AFTER AD.USTMEhT PLACE R O D P1 A-T h O - D 'I .E\ER inrlE\ \ \Em C-E S TO BE ODER&TED AT A.1 T..DES 4000 FT A\D ABOVE I
I CHOKE COIL ROD ADJUSTMENTS - TYPICAL FIG. 39 1
Delco Carburetor BULLETIN: 9D.SA RED SECTION
ADJUSTMENT PROCEDURES DATE: MAY 1983 PAGE: 9
M O D E L S 4 M V - 4MC - M 4 M C - M 4 M E REPLACES PAGE 9 DATED JUNE 1980 &NOVEMBER 1977
NOTE: PERFORM ADJUSTMENTS I N PROPER SEQUENCE.
C*Ol/ V A L V E <OM?LETEt"
CHOKE C O l L R O D ADJUSTMENT FIG. 40
@ALIGN MARKONCOVER W$TH SPEClF iEDPOlNiON HOUSING. NOTE ON MODELSWiTH SLOTTED COlL PICKUPLEVER.MAKE SURE COIL TANG 5 INSThLLED INSLOT IN LEVER ISEE INSETr 2)
LOOSEN THREE RETAINING SCRLWS (NOTE TIGHTEN
@ R O T A T E COYER AND COIL ASSEMBLY COUNTERCLOCKWISE UNTiL CHOKE VI\LVE JUSTCLOSES
FOLLOWERON HlGHESTSTEP OF CAM
lNSET ii 2
AUTOMATIC CHOKE COlL ADJUSTMENT FIG. 4 1
@ SETMARK ON LLECTRlCCHOKE
HIGHSTEPOFCAM
ELECTRIC CHOKE SETTING FIG. 42
@.",, ."W..O 0. PtUNGtR STEM 7 0
,"%.,"LE LEVER
THIS ADJUSTMENT ISTO BE MADE ONLY AFTER: I11 RE^ PLACEMENT OF THE SOLENOID. 121 MAJOR OVERHAUL OF THE CARBURETOR 1SPERFORMED.OR I31 THE THROTTLE 8 0 0 Y IS REMOVEOAND REPLACED.
THE FOLLOWING PROCEDURE ISUSEOTO ADJUSTTHE C.E.C. VALVE CONTROLLED ENGINE SPEEDON A RUNNING ENGINE (IN "NEUTRAL" FOR MANUAL OR IN "DRIVE" FOR AUTOMATIC TRANSMISSIONSI. WITH AIR CONDITIONING OFF. DISTRIBUTOR VACUUM HOSE REMOVED ANDPLUGGED. AND FUEL TANK HOSE FROM VAPORCANISTER DISCON. NECTED. NOTE: FOR CORVETTES. REMOVE FUEL TANK GASCAP INSTEAD OF HOSE FROM CANISTER.
BEFORE PROCEEDING. FOLLOW INSTRUCTIONSON VEHICLE TUNE UP STICKER.
1. ADJUSTCURB IDLE SPEED TOSPECIFICATIONS USING IDLE SPEED SCREW.
2. MANUALLY EXTEND THE C.E.C. VALVE PLUNGER TO CONTACT THE THROTTLE LEVER AND PULL OUTWARD ON PLUNGERSTEM TO ENDOF TRAVEL.
3. T U R N PLUNGER SCREW TO ADJUST ENGINE SPEED TO CAR MANUFACTURER'S SPEClFICA7IONS:
PASSENGER T a
A I T 650-D 650-0
MIT. 850-N 850-N
'350 V 8 M I T 900-N 900-N
CAUTION: DO N O T USE THE C.E.C. V A L V E TOSET
CURB I D L E SPEED.
C.E.C. V A L V E ADJUSTMENT FIG. 43
BULLETIN: 9D-5A R E D SECTION DATE: MAY 1983
THE FOLLOWING PROCEDURE IS USED TO ADJUST THE IDLE STOP SOLENOID TOCONTROL ENGINE SPEED ON A RUNNING ENGINE. FOLLOW INSTRUCTIONS ON VEHICLE TUNE-UP STICKER BEFORE PROCEEDING:
a WlTH ENGINE ATNORMAL OPERATING TEMPERATURE AND IDLE STOP SOLENOID ENERGIZED (PLUNGER STEM EXTENDED), ADJUST PLUNGER SCREW TOOBTAIN SPECIFIED ENGINE SPEEDS.
I LOW IDLE ADJUSTMENT I
I < TOSET LOWENGINE IDLE SPEED WlTH THE IDLE STOP SOLENOID DISCONNECTED ELECTRICALLY. ADJUST IDLE SPEEDSCREW ON THROTTLE LEVER
I TO OBTAIN SPECIFIED ENGINE SPEED.
I IDLE STOP SOLENOID ADJUSTMENT I FIG. 44
2 ."...as".., ...EM.." N "N.,, P L U W r l R CO*..CIS I*.O.Til L W L . IWL"*GIR E i i E N n T D I ,*I* .URN , * 1 2 ' * U e s l .URNS /OAD.I"I .
.$l*R .D," I U II.
THROTTLE DASHPOT ADJUSTMENT FIG. 45
@SOL~NOIDENERG~ZEO - AICCONPRESlORLEI\D DISCONNECTCD A T A ' C SSiEMISSlONLAsELONVrHlCLf COMPREEEORAICON. AITTRANSMISSION iN
LEnD&nERIDJUSTMENTI
CONNlCTlON
7U.N lDLlSPElDICRCWT0 SETCURBIDLE SPEEDTO
SOLINO1D PLUNGER TO SULLY %TEND SPECIFICATIONS - AIC 0-$ I S I I IMlbSION LABEL)
A I C IDLE SPEED A D J U S T M E N T
FIG. 46
NOTE INCINEMUSTBEWARM CHOKE WIDE OPEN C A M FOLLOWIA OFFSTEPS OF Fi\STlDLlCAM
R I W TO OBTAIN EClnEDCU4810LE
P M I S I S LABEL,
aPslv IYIACIENT VICUUMTOT*E&CTUITORTOlXTENDTHE FLUNOERFULLI N O m I e Y A C V U M SOURCE ISNOTIVAIIABLE.PUSH IN ON ENDOF PLUNeER UNTILSEATED
THROTTLE LEVER ACTUATOR ADJUSTMENT (ON CAR) FIG. 47
NOTZLNOlNEMUSTIEUARM- CMOIEWIDF OPEN - C I M WLLOWIR
WULT IDLE SPEED R W T O O B I I I N ECIFIEDCURBlDLE
hOTE 3 1'057295 3 8 17057298 1 2 1705'299 314 hOTE 4 VACI),M BREAd SETT hG 165 AFTER 22 500 M LES
RESET TO 260 BOTTOM EDGE OF VALVE
Fig. No. 1
INNER
9D-5A
PUMP ROD - 4 9/32 9/32 4 9/32 4 ~ lnw onn
9D-5A
Spec. I Fig. No.
114 1 1 3
Spec. 114
-
Fig. No.
1
INNER INNER[ 3 3
-
9D-5A
Spec. 114
9D-5A
-
Fig. No. 1
INNER
Spec.
15/32
3
Fig. No. 1
INNER
-
3
1600.~ SEE
LABEL
ADJUSTMENT AND TUNE UP SPECIFICATIONS MODELS 4MV-4MC-M4MC-M4ME
GAUGE NOTCH
FAST IDLE R.P.M.
TUNE-UP PR
Delco Carburetor
ADJUSTMENT AND TUNE UP SPECIFICATIONS MODELS 4MV-4MC-M4MC-M4ME
BULLETIN: 9D.SS RED SECTION
DATE MAY 1983
'If Idle Mixture Adjustment is Required, A New Propane Enrichment Method Is Necessary (See Bulletin 9D-1978A, Product Information Section).
Note 1: 17057582-584.17058464 15/32; Others 7/16. Note 2: Vacuum Break Setting ,180; After 22,500 Miles, Reset to ,275 Bonom Edge of Valve. Note 3: 27'; Reset to 30' at 30.000 Miles and Above. Note 4: 30'; Reset to 33'at 30,000 Miles and Above.
PAGE: 52
ADJUSTMENT AND TUNE UP SPECIFICATIONS MODELS 4MV-4MC-M4MC-M4ME
I TUNE UP SPECIFICATIONS I
REFER TO LABEL IN ENGINE COMPARTMENT FOR CORRECT TUNE-UP PROCEDURE AND SPECIFICATIONS
'If Idle Mixture Adjustment Is Required. A New Propane Enrichment Method Is Necessary (See Bulletin 9D-1978A. Product Information Section).
CHOKE COIL AOJUSTED FUEL LEVEL CHOKE COIL INCORRECTLY HIGH IN FUEL LEVEL
CORRECTLY STALLING ADJUSTED FLOAT BOWL O.K.
CONTINUES
FUEL PUMPPRESSURE HOT IOLE COMPENSATOR
FAST IDLE SPEEO HIGH.TEST FUEL PUMP
NOT OPENING OR CLOSING IIF USED)
CHECKCHOKEVALVE STILL STALLS AFTER SECONDARY
AN0 LINKAGE FOR START ADJUST VACUUM BINDING OR STICKING BREAK DIAPHRAGM ,
SECONDARY THROTTLE VALVES STICKING OPEN GASKETS NOT SEALING
CAUSING AIR OR FUEL
IF UNABLE TO AOJUST. CHECK IOLE SYSTEM FOR DIRT. AIR LEAKS, TO SPECIFICATIONS PLUGGEO PASSAGES IDLE PASSAGES
PLUGGE0,IOLE AIR BLEEDS PLUGGED OR MISSING
TEST FUEL CARBURETOR FLOODING
PUMP OR HlGH FUEL LEVEL
CHECK FOR DIRTY OR LEAKING FLOAT NEEOLE
CHECK FOR LEAKING. CHECK AND ADJUST LOADED OR MISALIGNED FLOAT
FLOAT
Delco Carburetor BULLETIN: 9D4T
DATE: N O V E M B E R 1971 P A G E 3 of 5 F I L E A F T E R B U L L E T I N 9D-5S
TROUBLE -SHOOTING
THE
QUADRAJET 4 MC - 4 MV CARBURETOR (CONT'D.)
ENGINE HESITATES ON ACCELERATION -
I
I PUMPCIRCUIT DIRTY.PLUGGE0, AIR VALVE BINDING
CHECK AND ADJUST OR INOPERATIVE
OR STICKING ACCELERATOR PUMP
I DISCHARGE BALLSTICKING. OIRTY, OR NOT SEATING I
I 1 VALVE OR SECONOARY THROTTLE VALVE LOCKOUT NOT OPERATING
LOW FUEL LEVEL I N FLOAT CHECK FUEL PUMP BOWL PRESSURE AND VOLUME
VALVESSTICKING OPEN SLIGHTLY
CO. W D , 1 3 1 , 1 3 2 : 1 6 . 9 X . 9 F R , 9 F D Q u a d r a j e t 14 b b l . ) C a r b u r e t o r P R I N T E D IN U.S.A.
@ 1 9 7 1 . G E N E R A L M O T O R S CORP.
ENGINE FEELSSLUGGISH OR FLAT O N ACCELERATION
VAL'IE OPERATION
ENGINE FLATTENSON ACCELERATION ACCELERATION DURING WARM OR COLD COLD DRIVEAWAY
-.
CHOKE COIL ROD
OIRTYORPLUGGEO. FLOATSTICKING OR AIR VALVE BINOING.OR
NOTPROPERLY ADJUSTED STICKING
CHECK CHOKE VACUUMBREAK
POWER SECONDARY MAlN NOZZLES PISTON STUCK OR BINDING PLUGGED OR OIRTY: SECONDARY
METERING ROOSMISALIGNEO. THROTTLE BODY OR STICKING.DIRTY, OR BENT MANIFOLD HEAT SECONDARY MAIN METERING JETS PASSAGES PLUGGED MAIN METERING JETS OIRTY.PLUGGE0, OR PLUGGEO
INCORRECTPART MAlN METERING ROOS
I CHECK AIR VALVE OR CHECK ENGINE IGNITION SECONDARY THROTTLE INITIAL TIMING VALVE LOCKOUT THROTTLE VALVESSTICKING
Delco Carburetor BULLETIN: 9D.5T DATE: NOVEMBER 1971 PAGE 4 of 5 FILE AFTER BULLETIN 9D-%
TROUBLE -SHOOTING
THE 1 QUADRAJET 4 MC - 4 MV CARBURETOR (CONT'D.)
CARBURETOR FLOODING ENGINE RUNS UNEVEN OR SURGES
RUN FUELPUMPTEST CHECKPRESSUREAND
ANDVOLUME CHECK FLOATNEEDLEANOSEATFOR 0IRT.WEAR. OAMAGE,DR LOOSE PARTCLEAN A L L FUEL
CHECK { F l L l BOWL W i l H FUELONBENCH ANOOBSERYLFORLEAKSI C H E C I S E A l O N A L L B O W L G A S K E I S
I CHLCKHOTIOLECOMPENSATORFOR OPENING AN0 CLOSING (WHERE USED1
PLUGGEOOR DIRTY CHECK C E C
I VALVE OPERATION ,ME ,,<F", I I
I M A N METLRlNG JETS PLUGGLO.100SE.ORWRONG I
I PART 1 I PRIMARY METERING RODS BENT.AITEREO.OR
POWER PlSTON ST lC r lNG DIRTY SPRlNG MISSING
I I FLOAT ADJUSTMENT INCORRECT
ROUGH ENGINE IDLE AND STALLING
I F ROUGH IDLE CONTlNUESAFTER CHECK IDLE SYSTEM 6 O R
ADJUSi10LE SPEED PROPER IOLLAOJUSTMENTCHECK O l R l Y OR PLUGGEO
TOSPECIFICATIONS
T~GHTLNALLCRRBURETORSSCREWS GIISI€TSNOTSEAL~NG IDLE COMPENSATOR NOT TOROUECARBURETOR T O M A N I F O L O MAY BE H & R O OR SRITTLE OPENING OR CLOSlNG ANoMANIFOLOTO ENGINE BOLTS CHECKFOR LOOSESCREWS
I
CARBURETOR IDLE PASSAGES SECONDARY THROTTLE VALVES O I R i Y OR PLUGGED
THROTTLE VALVESSTICKING OPEN
I
F L O A T N E E O I L S E A T LEAKING NEEDLE A N 0 SEATAOJUST FLOATNOTPAOPLRLYAOJUSTEO FLOAT 1 0 SPECIFICATIONS
I
CHECK FOR BINOIND FLOAT THROTTLLBOOYGASKETSFOR AIR LEAKS BETWEEN CASTINGS
CHECIPOWLR PISTON PASSAGES FOR AIR LEAKS
L I
CO. WD, 131. 132: 16.9X. 9FR.9FD ouadrajet (4 bbl.) Carburetor PRINTED IN U.S.A. O 1971. GENERAL MOTORS COW.
Delco Carburetor BULLETIN: 9DE.T DATE NOVEMBER 1971
, PAGE 5 of 5 FILE AFTER BULLETIN 9D 5S
TROUBLE -SHOOTING
THE
QUADRAJET 4 MC - 4 MV CARBURETOR (CONT'D.)
POOR ECONOMY Q RUN MILEAGE TEST IF MILEAGE ISPOOR. CHECK C.E.C. VALVE
CHECK DRIVER H ~ B I T S PROCEEDTOCHECKTHE
C H E C K C H O I E Y A L Y E A N D LINKAGE FORB iNO lNG OR ST lC I lNG
AIR VALVE BINDING. STICKING
-
AIR V A L V E OR SECONDRRI
CABURETOR FLOODING - I
I CHECK POWER PlSTON CHECK POWER PCSTON
SPRING FOR DISTORTION FORSTICKING OR BEING VACUUM PASSAGE FOR - BENT LEAKSOR BEiNG
I - PLUGGED
I
PUMP DISCHARGE BALL NOT SEATING CHECKFOR DlRT, OEFECTIYESEATOR DISCHARGESPRlNG
CHECKMETERING RODS FOR BEING BENT UP WRONG PART
FLOAT BENT. LEAKING. STICKING. OR MISALIGNED
OPENING AT CARBURETOR AOJUSTTWROTTLE LINKAGE
CHECK MAIN METERINGJETS FOR BEINGPLUGGED LOOSE OR INCORRECTPART
FLOATSETTING INCORRECT
MAINMETERINGJETSPLUGGEO,
MAKESURE GASKETS SEAL PROPERLY ON A L L VACUUM PhSSIGES