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I have devised a (for me) easy means of checking if the points gap (= dwell angle) is within specs. No need to open up the dizzy or use a feeler gauge.
This is how it works:
You know of course where on your crankshaft pulley the points are supposed to _open_ (in my case - a B20B motor – 10° BTDC). There is a mark there on the pulley (the timing mark).
Do the math and determine where on the pulley the points are supposed to _close_ (when the dwell angle is within specs). In my case the dwell angle should be between 59° and 65°. On the pulley this corresponds to twice the angle, i.e. 118° to 130°. Subtract from 180° which gives you an angle of 50° to 62° from the timing mark, at which the points are supposed to close again. Multiply by PI*pulley diameter (143 mm) and this gives you a peripheral distance of 62 mm to 77 mm.
Now get a pot of white paint and paint a white line on the periphery of the pulley, starting at a peripheral distance of 62 mm and ending at 77 mm, in an anti-clockwise direction, from the timing mark (NOT the TDC mark).
Then, using a light bulb connected from +12 volt to your points to check the static timing in the usual manner (light goes OFF when the points open), you can now simultaneously check if your dwell angle is okay by seeing if, when the light goes ON again, the mark on the timing cover is within the range of the white line painted on the pulley.
simplesimon
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