CARTER CARBURETOR AFB AVS SERVICE MANUAL – PDF DOWNLOAD

CARTER CARBURETOR AFB AVS SERVICE MANUAL – PDF DOWNLOAD

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CARTER CARBURETOR AFB AVS SERVICE MANUAL

CARTER CARBURETOR AFB AVS SERVICE MANUAL

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CARTER CARBURETOR AFB AVS SERVICE MANUAL – PDF DOWNLOAD

• The Carter models AFB “A luminum Four Bore” and AV$” Air Valve-Secondary” are very unique in design, as the main body and flange are cast as a one piece unit.
• This, along with the bowl cover, make up the two piece construction which is made of light, durable aluminum to dissipate heat. These carburetors are made in two basic configurat ions: For air cleaners with 41/,” openings.
• These models are 3¾” high from base to air cleaner gasket surface. For air cleaners with 5″ openings. These models are only 3v.” high. All units weigh approximately 7½ pounds. Throttle bore spacing is for “square hole” intake manifo lds. Primary and secondary high speed circuits incorporate the “air bled” design. FIVE CONVENTIONAL CIRCUITS ARE USED. THEY ARE: 1
• . Two float circuits 2 . Two low speed circuits 3. Two high speed circuits 4 . One pump circuit 5. One choke circuit The AVS circuitry is the same as the AFB except for the secondary side which has no venturis.
• ACCEPUUMRPA TOR CENRTOEDR (HINO U) ACC!LPUEMRPA TOR ROACRUM R ‘—-FSAPSEET DI DLE ASCDRJEUWST ING Cl/ASPBH IODL E ADSCJUSRETWIN G CIRCUITS FLOAT CIRCUIT
• The purpose of the float circuit is to maintain an adequate supply of fuel at the proper level in the bowl for use by the low speed, high speed, pump and choke circuits. On some models, fuel enters the bowl through either a screen or a sintered bronze filler which Is located in tho bowl oover at the fuel inlet.
• The sintered bronze element is spring loaded to prov ide pressure relief. This relief spring allows fuel pump pressure t o push the filter element off its seat if it becomes clogged. This will a llow

TABLE OF CONTENTS:

CARTER CARBURETOR AFB AVS SERVICE MANUAL – PDF DOWNLOAD

Description …………………………………………………………………………………………. 2
Float Circuit………………………………………………………………………………………… 2
Trouble Shooting ………………………………………………………………………………. 3
Bowl Vents ………………………………………………………… .-…………………………… 3
Cannister Vent. ………………………………………………………………………………… 4
Low Speed Circuit. ………………………………………………………………………………. 4
By-Pass…………………………………………………………………………………………… 5
Mixture Screws ………………………………………………………………………………… 5
Idle Limiter Caps ………………………………………………………………………………. 5
Adjustable Off-Idle Air Bleed ………………………………………………………………. 6
Idle Spoil Ports …………………………………………………………………………………. 6
Hot Idle Vent. …………………………………………………………………………………… 6
Hot Idle Vent With Wing ……………………………………………………………………. 7
Grounding Switch ………………………………………………………………………………… 7
Idle Solenoid ………………………………………………………………………………………. 7
Dashpot ……………………………………………………………………………………………… 7
Hydraulic Dashpot. ………………………………………………………………………………. 8
Trouble Shooting ………………………………………………………………………………. ‘. .. 8
High Speed Circuit Primary Side ……………………………………………………………. 8
Staged Step-Up Rods ……………………………………………………………………….. 9
Under-Strut PrimaryA ir Bleeds ………………………………………………………….. 9
Crotch Bleed …………………………………………………………………•………………… 9
Distribution Tabs ………………………………………………………………………………. 9
Trouble Shooting ………………………………………………………………………………. 9
High Speed Circuit Secondary Side …………………. ……………………………………. 9
Anti-Percolator………………………………………………………………………………….. 9
Vacuum Operating Secondary Valves ………………………………………………….. 1 O
Auxiliary Valve Operation …………………………………………………………………… 10
Secondary Initial Discharge ……………………………….•……………..•……….•…….. 1 o
AVS Secondary ………………………………………………. ……………………………….. 1 O
AVS Secondary High Speed Circuit. ……………………………………………………. 11
Pump Circuit ………………………………………………………………………………………. 11
Trouble Shooting ………………………………………………………………………………. 11
Choke Circuit. ………………………………… , ………………………………………………….. 12
Warm IdleA ir Bleed. …………………………………………………………………………. 12
Countershaft Linkage ………………………………………………………………………… 12
Cross-Over Choke …………………………………………………………………………….. 12
Choke Pull-Off ………………………………………………………………………………….. 13
Modulated Choke Pull-Off ………………………………………………………………….. 13
Trouble Shooting ………………………………………………………………………………. 13
Exhaust Damaged Choke …………………………………………………………………… 13
Fast IdleA nd Unloader. ……………………………………………………………………..1 3
MarineA nd SuperchargedA pplications. ………………………………………………….. 14
Exploded ViewA nd Parts List-AFB. ………………………………………………………1 5
Exploded ViewA nd Parts List-AVS. ………………………………………………………1 6
Adjustments …………………………………………….•……………………………•…………… 17

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