Hudson 1948 - 1952, Service Manual

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ENGINE TUNE-UP 2 -9
BREAKER ARM SPRING TENSION:
1. Hook a spring scale to the breaker arm at the contact and
pull at right angles to the contact surface. Tension should
be 17 to 20 ounces just as the points open.
2. Adjust spring tension by loosening screw (A), Figures 11
& 12, attaching breaker arm spring to plate and move end
of spring in or out of clip as necessary.
NOTE: If the tension is too weak the contacts will chatter
at high speed giving poor engine performance, while if the
tension is too strong, excessive wear of the cam and
breaker arm rubbing block will result.
DISTRIBUTOR POINT RESISTANCE TEST:
1. Using a Tach-Dwell unit, connect the negative lead to the
distributor primary terminal and the positive lead to a
ground, Figure 13.
FIGURE 13
2. Turn ignition key on. Turn the dwell control knob to
"Calibrate" position and crank the engine a fraction of a
revolution at a time until the highest reading is obtained
on the Dwell-Meter. The highest reading will occur when
the points are entirely closed. The meter should read
inside the b lock bar at the right end of the scale (Point
Resistance). A reading outside the
block bar indicates high resistance in the distributor
ground circuit.
NOTE: High distributor resistance will decrease primary
current draw, thus reducing coil output.
DISTRIBUTOR DWELL TEST :
1. Connect Tach-Dwell Tester negative lead to the distribu-
tor primary terminal and the positive lead to ground.
(ReInstall distributor cap, spark plug wires and distributor
primary wire.)
FIGURE 14
2. Turn switch to "Calibrate" position and adjust Dwell
Regulator knob until meter reads to "Set Line" . Turn the
Dwell Switch knob to the 6 lobe position for six cylinder
engines and 8 lobe for 8 cylinder engines. Turn Tachom-
eter Selector Switch to the 5000 R.P.M. position.
3. Start engine and run engine at idle speed. Tachometer w
ill indicate engine R.P.M. Dwell Meter will indicate the
dwell angle or degrees of dwell of the distributor points.
The d w ell angle on the six cylinder engine is 38 degrees,
breaker points