1974 GMC MagnavanFACTORY OEM SERVICE PROCEDURE

DELCO-REMY Transistorized: Overhaul: Disassembly

Remove rotor, centrifugal advance weights and weight springs. Remove tachometer drive gear if so equipped. Remove distributor shaft drive gear roll pin and slide drive gear and thrust washer from shaft,

NOTE: Support drive gear shoulder when driving out roll pin to prevent damage to drive gear.

Remove governor band from distributor housing and disassemble governor valve. Remove mainshaft from distributor housing and remove advance weight base and pole piece from mainshaft. Remove complete magnetic pickup assembly.

NOTE: It may be necessary to first remove vacuum advance unit mounting screws.

Remove vacuum advance unit, brass and felt washers and any damaged oil seals.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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