Distributor: Description and Operation

DISTRIBUTOR
The different ignition systems and engines use different distributors. The basic TCI-h system uses a distributor with mechanical advance mechanisms, as shown in Fig. 5-1. The distributor used for the TCI-h system with knock control is very similar-many parts are interchangeable-but since timing advance is controlled electronically, the Hall sender is rigidly mounted and there are no mechanical advance mechanisms. The same type of distributor is used on 16-valve engines (engine code PL, 9A), although there are some physical differences resulting from its unique mounting location on the cylinder head. This distributor is illustrated in Fig. 5-2. Fig. 5-3 shows the distributor cap and suppression shield used on distributors for all engines.

Fig. 5-1:

Fig. 5-1. Distributor assembly used with basic TIC-h ignition system. Distributor used for TCI-h with knock control is similar, but distributor housing has no vacuum diaphragm.

Fig. 5-2:

Fig. 5-2. Distributor used on 16-valve engines (engine code PL 9A).

Fig. 5-3:

Fig. 5-3. Distributor cap with suppression shield used on all engines. Suppression shield is grounded by distributor cap attachment clips.

The distributor cap and rotor are generally replaced as a part of normal maintenance.

The Hall sender, the trigger wheel, the vacuum diaphragm, the suppression shield, and the dust shield are all available as replacement parts, but replacement is not routinely necessary. The distributor housing parts, including the centrifugal advance mechanism and shaft bushings, are not available. The distributor housing must be replaced as a unit.

Whenever the distributor is disassembled, all of the shims, circlips, gaskets, and 0-rings should be replaced. Any disassembly or removal of the distributor will require checking and adjusting the ignition timing, as described Ignition Timing.