1965 Evinrude SportFour Heavy Duty 60 HP Outboards Service Manual, 4204, Page 34Get this manual
Figure 4-16Testing Breaker Points
DISTRIBUTOR
LEAKAGE TESTING The distributor cap, rotor, and spark plug high tension leads may be tested for leakage or insulation failures by using the ignition analyzer and the ignition coilConnect the coil to the ignition analyzer as for the coil testConnect separate test lead with suitable clips to the secondary terminal of the coil and to the conductor of the component being tested (coil lead terminal on distributor cap, rotor arm, and spark plug high tension lead)Probe the entire insulated surface of the component being tested with the grounded test probeSee Figure 4-17ArCing will be apparent wherever the insulation has broken down, due to moisture or carbon tniils
Figure 4-18Vent ScreensDistributor Cap DISTRIBUTION CHAMBER
It is very important that the distributor cap retaining
screws be kept tight at all timesThis will assure positive location and prevent dirt from entering the distribution chamberThe ventilating screens in the distributor cap and magneto housing should be kept free from dirt to assure proper ventilationScreens that are punctured should be replaced, since the fine mesh of the screens serves to contain any spark or flashover within the magnetoSee Figure 4-18