GM 94845172 DISTRIBUT

Dependent on the distributor, first of all, the distributor cable must be removed, then the rotor, which is fixed by two screws, the advance weight springs and the weights as well. If at all it applies, remove the radio frequency shelter too. Remove the roll pin which holds the gear in position to the shaft and remove the gear and the spacers. Before sliding it from the housing, make sure that the shaft is not burred. Then, undo the cam weight base assembly and the screws that are fitted to hold the vacuum unit; the unit can then be lifted. Remove first the spring retainer and then the breaker plate assembly. Take out the contact points as well as the condenser, the felt washer and the plastic seal under the breaker plate. Wipe all the applicable areas with a cloth that has been rubbed in some solvent and examine the parts for wear, distortion and scoring; the rotor and distributor cap should in particular be replaced if cracked. Pack general purpose grease in the lubricating cavity in the housing; replace the old rubber seal with a new one and the felt washer as well. Mount the vacuum unit, the breaker plate and the spring retainer on the upper bushing of the housing. Add the engine oil on the cam weight base and place it on the mainshaft then follow the installation of the weights and springs of the engine. Place the mainshaft in the housing and fit the shims and drive gear and a new roll pin is required on this case. Last, fasten the contact point set, match the round and the square pilot holes and finally, the installation of the rotor before replacing the distributor.

To check the pick-up coil, one has to take out the distributor and then the rotor to do it. Then open the tap module by pulling and taking out the two screws of this module, then move the module aside and remove the connection from the '8' and 'C' terminals, then connections from the 'W' and 'G' terminals. Gently expand the roll pin from the drive gear and finally, the gear, shim and the tanged washer will have to be withdrawn from the distributor shaft. Before pulling the shaft out of the housing, make sure that it is not caked, and remove the washer from the upper end of the distributor housing. Slide off the retaining ring for removal of the pick-up coil and pole piece; this can be done after employing the screw driver to pry out the 'C' clip. The vacuum unit can be detached by unscrewing two screws, then you can take out lock ring, pick-up coil retainer, shim and felt washer. Ground the capacitor lead and remove the capacitor with one bolt, then, the wiring harness from the distributor housing. Wipe all parts with a cloth that has a solvent on it and look for any signs of deterioration or damage and replace when needed. In assembly, there should be the vacuum unit that should be placed at the housing and fixed with two screws. Install the felt washer over the lubricant reservoir on top of the housing then the shim should be placed on top of the felt washer. Place the pick-up coil and pole-piece assembly in place and secure it back into the vacuum advance arm and place the retaining ring on. The washer must be fitted into the top of the housing while the distributor shaft should be fitted and then measure equal distances to the pole piece projections. Fit in the tanged washer, shim and drive gear and make the gear coincide with new roll pin. Finally screw the capacitor halfway in and snap the connector to the 'B' and 'C' terminals of the module and the tab must be at the top. 2 Insert the module into the base with silicone grease applied at the base of the module in order to make a good heat conduction and use two screws. Insert the wiring harness into the housing with the grommet added to the housing notch, then bring the pink terminated wire to the capacitor stud and connect it with the screw for the capacitor while tightening the black wire terminated to the capacitor mounting screw. Fix the white wire to module 'W' and the green wire to 'G' of the pick-up coil. Last, place the advance weights, weight retainer (dimple down), and springs and fasten the rotor with two screws so that the side notch of the rotor fits the tab situated on the base of the cam weight, and then the distributor.

Ensure the distributor seats completely and check the alignment marks between the distributor base and the block, as well as the rotor alignment with the mark made on the distributor base.