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 dust shield, rotor, capacitor, insulators or housing in any
degreasing compound, since this may damage parts.
(2) Check centrifugal advance parts, weights,
springs and plate for signs of wear or damage. If
damaged, replace the distributor.
(3) Replace contact points if worn or badly
pitted.
(4) Check breaker lever rubbing block for
excessive wear.
(5) Check capacitor for leakage. If it cannot
be tested, replace.
(6) Check distributor cap and rotor for
cracks, burning of contacts or carbon streaks. Replace
if damaged.
e. Assembly and Installation of Distributor.
(1) Install primary lead.
(2) Install capacitor and contact points. Set
point gap to 0.016 in.
(3) Saturate felt wick in breaker cam with
light engine oil and then install dust shield and rotor.
(4) Be sure rubber bushing is in engine drive
housing and then install distributor. Using rotor, turn
distributor shaft until offset tongue of coupling enters
groove in top of oil pump drive gear.
(5) Install advance arm washers and
capscrews. Install distributor cap. Install spark plug
cables, high tension cable to the coil, and primary lead
to coil.
(6) Check engine timing (para 4-36).
4-37. Spark Plugs
a. Removal. Disconnect the spark plug leads from
the spark plugs. Clean the area of the cylinder head
around the plugs. Use a spark plug socket wrench to
remove spark plugs.
b. Cleaning and Removal.
(1) Clean the exterior of the spark plugs with
a cloth dampened with a cleaning solvent. Use a
sandblast type cleaner, if available, to clean the
electrodes.
(2) Inspect the spark plugs for cracked
insulation and burned electrodes.
(3) Test the spark plugs on a high-voltage
Figure 4-31. Distributor assembly.
tester. A hot, blue spark must arc across the electrodes
during the test. Replace shorted plugs.
(4) If spark plugs are suitable for reuse,
(4) Remove contact points and capacitor.
check and adjust the spark plug gap. Check the gap on
(5) Remove nuts and washers from end of
new or used spark plugs with a round feeler gage. Refer
primary terminal and then remove stud and the two
to figure 4-32. The required gap is 0.025 inch. Adjust
insulating blocks.
the gap to this dimension, if necessary, bending the side
d. Inspection of Distributor.
electrode only.
(1) Clean all parts thoroughly and replace any
damaged or worn parts. However, do not clean cap,
4-32
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