Engine Controls - Remove/install/overhaul: Other Mazda 626 GD

DISTRIBUTOR

Note. Miata does not use a distributor.

Refer to the appropriate illustration when removing, overhauling or installing a distributor. (Scheme 7)through (Scheme 15).

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

FUEL SYSTEM PRESSURE RELEASE

To relieve fuel pressure, disconnect circuit opening relay or fuel pump or airflow sensor electrical connector. See FUEL PRESSURE RELIEF TABLE . Start and run engine until it stops. On 626, circuit opening relay is located on relay panel next to fuse panel, below left side of fuse block. On B2600i, circuit opening relay is located behind left kick panel. On Miata, circuit opening relay is located behind steering wheel lower trim cover.

FUEL PRESSURE RELIEF

Float Level

1. With engine running, check fuel level in fuel bowl sight glass. If fuel level is not to specified mark on sight glass, remove carburetor from vehicle.
2. Remove air horn from carburetor. Remove gasket from air horn. Invert carburetor and allow float to hang by its own weight. Measure clearance between top of float and air horn. (Scheme 16)
3. Float clearance must be within specification. See «B2200 CARBURETOR ADJUSTMENT SPECIFICATIONS»(ref-18198-S11114794932000123000000) table. Bend float seat for adjustment.

Scheme 16

Float Drop

Position air horn upright. Allow float to hang by its own weight. Measure clearance between bottom of float and air horn. Float drop must be within specification. Bend float stop for adjustment. (Scheme 17) See B2200 CARBURETOR ADJUSTMENT SPECIFICATIONS table.

Scheme 17

Choke Linkage (Fast Idle Opening Angle)

1. Fully close choke valve. Position fast idle cam on second highest step. Measure clearance between primary throttle valve and throttle bore wall. (Scheme 18)
2. Clearance should be within specification. Clearance is adjusted by rotating fast idle adjusting screw. See «B2200 CARBURETOR ADJUSTMENT SPECIFICATIONS»(ref-18198-S11114794932000123000000) table.

Scheme 18

Choke Valve Opening

Ensure choke linkage adjustment is correct. Place fast idle cam on second highest step. Measure clearance between choke valve and air horn. (Scheme 19) See B2200 CARBURETOR ADJUSTMENT SPECIFICATIONS table. Adjust clearance to specification by bending starting arm. If large adjustment is required, bend choke rod.

Scheme 19

Choke Diaphragm

1. Using vacuum pump, apply approximately 16 in. Hg to choke diaphragm. Lightly close choke valve. Measure clearance between choke valve and air horn. (Scheme 20)
2. Clearance must be within.067-.085" (1.70-2.16 mm). Adjust clearance by bending tang on choke lever.

Scheme 20

Choke Unloader

Close choke valve. Fully open primary throttle valve. Measure clearance between air horn and choke valve. Adjust clearance to.110-.143" (2.80-3.62 mm) by bending tab. (Scheme 21)

Scheme 21

Secondary Throttle Valve

1. Secondary throttle valve should start to open when primary throttle valve opens 50-54 degrees. Measure clearance between primary throttle valve and bore when secondary throttle valve starts to open. (Scheme 22)
2. Clearance should be within.289-.325" (7.35-8.25 mm). Adjust clearance by bending tab.

Scheme 22

Accelerator Linkage

1. Accelerator pedal cable free play at carburetor should be .039-.118" (1.0-3.0 mm). Cable free play can be adjusted by use of cable adjusting nut.
2. Adjust cable free play. Fully depress accelerator pedal. Note that throttle valves fully open. Accelerator stop bolt can be adjusted to obtain full valve opening.

B2200 CARBURETOR ADJUSTMENT SPECIFICATIONS (1)

THROTTLE BODY

Note. Removal and installation for models not listed is similar.