Edelbrock 1921 Benutzerhandbuch

Page 3 of 4

Rev. 10/02

FRONT VACUUM BREAK ADJUSTMENT

AIR VALVE ROD ADJUSTMENT

UNLOADER ADJUSTMENT

SECONDARY OPENING ADJUSTMENT

SECONDARY CLOSING ADJUSTMENT

REMOVE & REPLACING TAMPER RESISTANT CHOKE COVER

SECONDARY THROTTLE LOCK-OUT ADJUSTMENT

MEASURE DISTANCE
BETWEEN UPPER EDGE
OF CHOKE VALVE AND
AIR HORN WALL.

BUBBLE ON ANGLE GAUGE
SHOULD BE CENTERED.
SEE FIG. 7

TO ADJUST TURN
SCREW

PLACE CAM FOLLOWER ON
HIGH STEP OF FAST IDLE
CAM.

TAPE PURGE BLEED HOLE IN
COVER. (WHEN USED). APPLY
OUTSIDE VACUUM SOURCE
TO FULLY SEAT DIAPHRAGM.

TO ADJUST
BEND ROD

MEASURE BETWEEN UPPER EDGE OF
CHOKE VALVE AND AIR HORN WALL.

STEP A

CHOKE VALVE AND THROTTLE VALVES
CLOSED.

STEP B

CHOKE VALVE HELD WIDE OPEN BY

PUSHING DOWN ON TAIL OF FAST

IDLE CAM.

TO ADJUST BEND
LOCKOUT PIN.

MEASURE DISTANCE
BETWEEN LOCK-OUT PIN AND
LOCK-OUT LEVER.

MEASURE DISTANCE BETWEEN
END OF LOCK-OUT PIN &
LOCK-OUT LEVER.

TO ADJUST FILE
END OF PIN.

(.015” CLEARANCE)

CLOSE CHOKE VALVE BY
PUSHING UP ON TANG ON
VACUUM BREAK LEVER.
(BUBBLE ON ANGLE GAUGE
SHOULD BE CENTERED).

TO ADJUST
BEND TANG.

THROTTLE VALVES HELD IN
WIDE OPEN POSITION.

OPEN PRIMARY THROTTLE SLOWLY
UNTIL ACTUATING LINK CONTACTS
TANG.

TO ADJUST
BEND TANG.

LINK SHOULD BE IN
CENTER OF SLOT.

2 0’CLOCK
POSITION

3/16”

1/8”

3/4”

ADAPTER MADE

FROM STEEL TUBING

DISASSEMBLY: CAREFULLY ALIGN A #21 DRILL (.159 ”) ON PO RIVET HEADS AND

DRILL ONLY ENOUGH TO REMOVE RIVET HEAD, DRILL ALL RIVET HEADS (3) AND

USE A DRIFT PUNCH AND HAMMER TO DRIVE THE REMAINDER OR THE RIVETS OUT

OF THE CHOKE HOUSING. REMOVE CHOKE COMPONENTS.

REASSEMBLY: PLACE CHOKE CAP IN PLACE AND ROTATE CLOCKWISE UNTIL COIL

TANG ENGAGES LEVER TANG AND CLOSES CHOKE VALVE. IT IS IMPORTANT THAT

THIS ENGAGEMENT IS ACHIEVED FOR PROPER OPERATION.

MODEL 1903: ROTATE AND ALIGN THE NOTCH IN THE COVER WITH THE PROTRUSION

ON THE RETAINER INSTALLED AT THE 2 O’CLOCK POSITION.

MODEL 1904: ROTATE AND ALIGN THE NOTCH IN THE COVER WITH THE RAISED

CASTING BOSS AT THE 2 O’CLOCK POSITION. RETINING THE COVER WITH THE POP

RIVETS PROVIDED IN THE KIT. IT MAY BE NECESSARY TO USE AN ADAPTER (TUBE)

IF INSTALLATION TOOL INTERFERES WITH THE ELECTRICAL CONNECTION TOWER IN

THE CHOKE COVER.

TURN CLOCKWISE

FOR RICHER SETTING

CHOKE VALVE WIDE OPEN FAST
IDLE CAM FREE OF CAM
FOLLOWER.

CURB IDLE SET TO
PROPER RPM

LEVER AGAINST TANG.

MEASURE DISTANCE BETWEEN
ROD AND SLOT IN LEVER.

(.020” CLEARANCE)

AIR VALVE COMPLETELY
CLOSED. MEASURE DISTANCE
BETWEEN ROD AND END OF
SLOT IN LEVER

TAPE PURGE BLEED HOLE IN
COVER (WHEN USED). APPLY
OUTSIDE VACUUM SOURCE TO
FULLY SEAT DIAPHRAGM

PUSH UP ON INSIDE CHOKE COIL

LEVER UNTIL TANG ON

INTERMEDIATE CHOKE SHAFT

CONTRACTS TANG ON VACUUM

BREAK PLUNGER STEM

Fig. 9

Fig. 10

Fig. 11

Fig. 13

Fig. 14

Fig. 15

Fig. 12

(ON CAR)