MECHANICAL BOWL VENT VALVE ADJUSTMENT
NOTE: This is not a precise adjustment. The purpose of this adjustment is to ensure that the bowl vent is open at idle and closed at greater throttle openings. It may be performed on or off the vehicle.
1978 American Motors
- Remove rollover check valve from air horn
- Place throttle on HIGH step of fast idle cam
- Bowl vent should be closed
- Manually move fast idle cam until throttle screw drops to second step. Bowl vent should just begin to open
- If bowl vent valve is closed on High, Fourth, or Third steps of cam, bend tab of valve until it is closed
- If valve is not starting to open on Second step of cam, bend tab until valve is just off its seat
1978 Chrysler Corp
- Ensure accelerator pump and curb idle speed are adjusted correctly
- Remove step-up piston cover plate and gasket from carburetor
- Measure clearance by inserting .080" pin gauge between top of bowl vent valve and seat
- If adjustment is needed, bend bowl vent lever tab.
- NOTE: be sure to support bowl vent lever assembly while bending tab to avoid damage to assembly
- Install cover plate and gasket
Bowl Vent Adjustment When no pin position wire is available, use some wire tightly wrapped around the stem. |
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