Rochester Varajet Air Valve and Vacuum Break Technical Info

AIR VALVE ROD ADJUSTMENT (4 CYLINDER)

Seat vaccum diaphragm using outside vacuum source (see note)
Air valve completely closed
Place gauge between rod and end of slot in plunger
Bend for specified clearance between rod and end of slot in plunger
NOTE: plug end cover with tape if purge bleed hole is used. Remove tape after adjustment

AIR VALVE ROD ADJUSTMENT (6 CYLINDER)

PRIMARY SIDE VACUUM BREAK ADJUSTMENT (TYPICAL)

FIGURE 1
Use choke valve measuring gauge if you have one. Tool may be used with carburetor on or off engine. If off engine, place carburetor on holding fixture so taht it will remain in same position when gauge is in place
Rotate degree scare until zero is opposite pointer
With choke valve completely closed, place magnet squarely on top of choke valve
Rotate bubble until it is centered
FIGURE 2
Rotate scale so that degree specified for adjustment is opposite pointer
Seat choke vacuum diaphragm using vacuum source
Hold choke valve toward closed position by pushing on intermediate choke lever. Make sure plunger bucking spring (if used) is compressed and seated
To adjust, bend vacuum break rod until bubble is centered
Remove gauge

SECONDARY SIDE VACUUM BREAK ADJUSTMENT (6 CYLINDER)

FIGURE 1
Use choke valve measuring gauge if you have one. Tool may be used with carburetor on or off engine. If off engine, place carburetor on holding fixture so that it will remain in same position when gauge is in place.
Rotate degree scale until zero is opposite pointer
With choke valve completely closed, place magnet squarely on top of choke valve
Rotate bubble until it is centered
FIGURE 2
Rotate scale so that degree specified for adjustment is oppostie pointer
Seat choke vacuum diaphragm using vacuum source
Hold choke valve towards closed position by pushing on intermediate choke lever. Make sure plunger bucking spring (if used) is compressed and seated
Remove gauge

Air Valve and Vacuum Break Varajet