1948-1952 Shop Service Manual - - Hudson-Essex-Terraplane Club

2 - 12 ENGINE TUNE-UP
6. If the degree of advance on the degree ring is more than
specifications call for at the same R.P.M., it indicates that
the governor spring tension is too weak and the advance is
too rapid.
7. If the degree of advance on the degree ring is less than
specifications call for at the same R.P.M., the spring tension
is too stiff and the advance is too slow.
8. Check the advance both up and down the speed range so
that the sluggish action of the governor mechanism will be
indicated and may be corrected by cleaning and lubrication.
NOTE: Every 2,000 miles, lubricate contact arm pivot,
wick top of shaft, cam lobes and 3 to 5 drops of medium
engine oil at oiler.
3. With ignition switch on, turn Master Control Switch to
"Coil Set" and adjust Coil Set Regulator knob until meter
reads on proper "Set Line".
4. Turn switch to "Coil Test" position. The meter reading
must be within the " Good Coil" band and hold steady to
denote a good coil. A reading out side the "Good Coil"
area or an erratic reading of 3 to 5 divisions inside "Good
Coil" band indicates a bad coil.
NOTE: If the coil meter does not read in the "Good Coil"
band, remove the coil cap and connect test leads directly to
the primary connections.
After making direct connections to the coil, retest, and if
the meter does not read in the "Good Coil" band, replace the
coil.
NOTE: Before to sting any ignition coil it should be
brought to operating temperature. Follow testing e quip m
e n t manufacturer's procedure for "Coil Heating".
FIGURE 16
COIL
COIL TEST:
1. Calibrate Coil Breaker Unit.
2. Disconnect the primary ignition lead at the distributor and
the high tension lead from the coil. Connect red lead of
Coil Breaker Unit to the primary wire disconnected from
the distributor primary terminal, and the ground lead to
the battery starter terminal, Figure 16.
FIGURE 17
COIL SECONDARY RESISTANCE CHECK:
1. Calibrate Coil Breaker Unit by connecting the ground (Blue) and
positive primary (red insulator) test leads together.
2. Turn master switch "On".