Spirit L6-258 4.2L VIN C 2-bbl (1982)
Vacuum Advance Unit: Service and Repair
Fig 1 Solid State Ignition Distributor
VACUUM UNIT, REPLACE
1. Disconnect vacuum hose.
2. Remove vacuum unit attaching screws and the vacuum unit. It is necessary to tilt the vacuum unit to disengage the link from the sensor pin and
also loosen the base plate screws for clearance.
3. Reverse procedure to install. If a new vacuum unit is installed, it must be calibrated as follows:
a. Insert an appropriate size Allen wrench into vacuum hose tube of original vacuum unit. Rotate Allen wrench clockwise and note the number of
turns required to bottom the adjusting screw.
b. Insert Allen wrench into vacuum hose tube of replacement vacuum unit. Turn the Allen wrench clockwise until the adjusting screw is
bottomed, then rotate Allen wrench counter clockwise the number of turns noted in the previous step.