Disassembly & Reassembly

Disassembly procedure is not available from manufacturer. See Fig 1 - Fig 4 for exploded views of distributors.
When reassembling, ensure pick-up assembly arm is correctly installed on pin. If not, arm can float and cause ignition timing to vary. To prevent corrosion, lubricate terminals with petroleum jelly before installation.
To prevent heat damage, coat bottom of module and module rest pad in distributor housing with silicone grease. Before installing roll pin in driven gear, ensure timing mark on roll pin and rotor tip align. See Fig 1 - Fig 4 .

Fig 1: Exploded View Of HEI-EST Distributor (2.5L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Exploded View Of HEI-EST Distributor (3.1L)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Exploded View Of HEI-EST Distributor (4.3L & V8)

Courtesy of GENERAL MOTORS CORP.

Fig 4: Exploded View Of HEI/EST Distributor with Hall Effect

Courtesy of GENERAL MOTORS CORP.