Diaphragm and breaker plate assembly
- Remove the vacuum connection and gasket, and then remove the calibrating washers, return spring, and stop.
- Remove the retaining screw and lift the condenser off the breaker plate (Fig. 107).
- Remove the retainer and washers securing the moveable breaker plate to the stationary sub-plate.
Assembly.
Diaphragm and breaker plate assembly
- Install the breaker point assembly on ‘the breaker plate. Position a new, condenser and secure it with the retaining screw.
- Install the stop, return spring, and calibration washers, then position a new gasket on the vacuum connection.
Installation of components
- Install the weights in the housing. Then install the distributor weight springs on the adjusting brackets from which they were removed. Install the upper thrust washer on the distributor shaft.
- Fill the grooves in the upper portion of the distri-butor shaft with distributor cam lubricant. Position the cam on the distributor shaft and install the cam retainer. Apply a light film of distributor cam lubricant to the cam lobes. Install the wick in the cam assembly. Saturate the wick with SAE lOW engine oil.
- Position the stationary sub-plate in the distributor. Install one end of the ground wire under the plate retaining screw closest to the diaphragm mounting flange.
- Position the entire breaker plate assembly in the distributor housing and~, secure It In place on the sub-plate by installing the washers and retainer. Be sure the protruding edges of the spring washer are facing upward.
- Attach the ground wire to the breaker point attaching screw, farthest from the breaker point adjustment slot. Working from inside the distributor housing, pass the primary wire assembly through the opening in the distributor body. From outside the distribution, pull the wire through the opening until the locating stop is flush with the inside of the distributor.
- Connect the condenser wire and the primary lead wire to the breaker points.
- Position the. diaphragm assembly and hook the diaphragm link over the pin on the breaker plate. Install the diaphragm assembly retaining
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screws. Secure the diaphragm link with a spring retainer.
8. Adjust the breaker point spring tension, align the breaker points, and adjust the breaker point gap. Check the breaker point dwell and resistance. Check the centrifugal and vacuum advance (refer to page 72).
9. Install the rotor and distributor cap.
10. Connect the primary wire.
Distributor diaphragm leakage and freeness of operation
These tests can be made with the distributor installed on the engine. The tests are sufficient for an engine tune-up. However, if there are indications that the spark advance is not functioning properly, remove the distributor from the engine and check it on a distributor test set.
Check the vacuum advance mechanism for freeness of operation by manually rotating the breaker plate in the direction of rotation. Do not rotate the plate by pushing on the condenser or the breaker point. Use a hook or other suitable instrument to rotate the plate.
The breaker plate should turn without binding and return to its original position when released. If the break-er plate binds, remove the plate. Clean, Inspect and lubricate it as described for the particular distributor. To check the diaphragm for leakage.
- Remove the vacuum line from the distributor. Adjust the vacuum reading of a distributor tester to its maximum position. Hold one hand over the end of the tester’s vacuum hose and note the maximum reading obtained. Do not exceed 25 in. Hg.
- If the maximum reading is 25 in. Hg or less, connect the tester’s vacuum line to the vacuum fitting on the diaphragm without changing any of the adjustments. The maximum gauge reading should not be less than it was in step 1. If it is less, the diaphragm is leaking and should be replaced.
Distributor breaker plate wear
A worn breaker plate will cause the breaker point gap and contact dwell to change as engine speed and load con-ditions are varied. If this fault is suspected remove the distributor from the engine and check it on a Distributor Tester as follows:
Adjust the test to O deg. advance, 0 In. vacuum, and 1000 r.p.m. Adjust the dwell angle to 26 deg. Apply vacuum to the distributor diaphragm and increase it very slowly while observing the indicated dwell angle. The maximum
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