Craftsman 161.210400 Owner's Manual

Page 20Test Number 12--Breaker Point ResistanceNOTE; This test does not apply to Electronic ignition systems.NOTE: Remove the distributor cap before testing and inspect the contactpoints. If they are blued, blackened, or noticeably pitted, they shouldbe replaced. Normal, used contact points are light gray In color.i. Place the Function Selector Switch in the POINTS position. ,Z. Disable engine to prevent starting by removing coil secondary leadfrom distributor and connect to a good engine ground with Jumper leadas illustrated below. #3. Have an assistant turn the ignition switch to the START position momentarilyto crank engine slowly a little at a time until the points are closedas indicated by the lowest meter reading.4. Points are in GOOD condition if the reading is .3 volts or less. Replacepoints if the reading is out of the good zone, or over .3 volts.5. If the reading still exceeds .3 volts, check the distributor groundplate, (plate on which points are mounted), pigtail extensionto primary lead inside distributor or primary lead to coil for breaks,or misaligned point contacts on points. Refer to your vehicle servicemanual for other tests relating to the Breaker Point Circuit.6. When new points are installed, always clean and lubricate cam,check again for contact alignment, and resistance, Adjust tocorrect Dwell before startlng--See Test Number I 3, Dwell Adjustment.7. Correct the defect and repeat the test. When the points check OK,turn the ignition switch OFF. Reinstall the high tension lead inthe center of the distributor cap.FIGURE 21SECONDARY COIL CONNECTIONSTO PREVENT ENGINE STARTING BLACKCLIPGREENCLIPDIST.TO GROUNDON ENGINEPRIMARY LEADGROUNDONENGINE