Hudson 1955 Rambler, Техническое и сервисное руководство

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E L E C T R I C A L
33
To refill the reservoir, remove the oil plug and
add Grade 20W oil. When replacing plug, seal with
a compound that will hold against oil. In
addition, a trace of high melting point ball
bearing grease should be placed on the breaker
cam every 5,000 miles. Also at 5,000 miles, place
one drop of light engine oil on the breaker lever
pivot and a few drops on the felt wick under the
rotor.
Inspection
The cap should be removed at regular intervals
and the contact points, rotor and cap examined.
Check the high tension wiring for frayed or
damaged insulation and poor connections at the
cap or plugs. Replace if necessary. Replace the
cap or rotor if they are cracked or show
carbonized paths indicating the secondary cur-
rent is leaking to ground over the surface of
the material.
Contact Points
Contact points that are burned or pitted should
be replaced or dressed with a clean, fine-cut
contact file. The file should not be used on
other metals and should not be allowed to become
greasy or dirty. NEVER USE EMERY CLOTH TO CLEAN
CONTACT POINTS. Contact surfaces, after consid-
erable use, may not appear bright and smooth,
but this is not necessarily an indication that
they are not functioning satisfactorily.
Oxidized Contact Points
Oxidized contact points may be caused by high
resistance or loose connections in the condenser
circuit, oil or foreign materials on the contact.
surfaces, or most commonly, high breaking
current. Check for these conditions where burned
contacts are experienced.
The Contact Point Opening
Contact point opening must be set to specifica-
tion. Points set too closely may tend to burn
and pit rapidly. Points with excessive separa-
tion tend to cause a weak spark at high speed.
The point opening of new points may be checked
with a feeler gauge. Use of a flat feeler gauge
on used points is not recommended, since the
roughness of used points make it impossible to
set the point opening accurately by this method.
A dial indicator is recommended to check the
point opening of used points. When necessary to
check and adjust point opening with a feeler
gauge, proceed as follows:
Rotate breaker cam until breaker lever rubbing
block is on the high point of the cam lobe, thus
giving the maximum point opening. Loosen the
clamp screw holding the contact support and
adjust point opening by turning the eccentric
screw in the contact support. Tighten clamp
screw; check with gauge again after tightening
clamp screw. THE CONTACT POINTS SHOULD BE CLEANED
BEFORE ADJUSTING IF THEY HAVE BEEN IN SERVICE.
The cam or contact
angle is the angle in degrees of cam rotation
through which the points remain closed.
Contact Point Pressure
Contact point pressure must fall within the
limits given. Weak tension will cause point
chatter and ignition miss at high speed, while
excessive tension will cause undue wear of the
contact points, cam and rubbing block.
The Condenser
Four factors affect condenser performance and
each factor must be considered in making any
condenser tests. BREAKDOWN is a failure of the
insulating material, a direct short between
the metallic elements of the condenser. This
prevents any condenser action. LOW INSULATION
RESISTANCE or leakage prevents the condenser
from holding a charge. A condenser with low
insulation resistance is said to be "weak."
All condensers are subject to leakage, which
up to a certain limit, is not objectionable.
When it is considered that the ignition
condenser performs its function in approxi-
mately 1/12,000 of a second, it can be seen
that leakage can be large without detrimental
effects. It must be considered, however, in
any condenser test. HIGH SERIES resistance is
excessive resistance in the condenser circuit
due to broken strands in the condenser lead
or to defective connections. This will cause
burned points and ignition failure upon
initial start and at high speeds. CAPACITY is
built into the condenser and is determined by
the area of the metallic elements and the
insulating and impregnating materials. For a
complete check of the condenser, it is
desirable to use a tester which will check for
the above four conditions.
IGNITION TIMING
Timing of the distributor to the engine should
be made after the distributor has been
calibrated in accordance with specifications.
(See Distributor Specifications.)
"Hornet" V-8 Series
The ignition timing is controlled by the
distributor location in its mounting. The
breaker contact set that controls the inter-
ruption of the primary circuit (circuit
opening contact) must just open when the 5°
B.T.D.C. No. 1 cylinder position of the
crankshaft is obtained (Fig. 33) .
Timing marks are located on vibration damper
pulley and timing chain cover.
A basic timing location position for the
distributor is given to prevent undue bending
of the vacuum tube and rewiring of the
distributor cap for timing and firing order.
This timing should be done whenever the
distributor is removed and the engine inadver-
tently cranked. Locate No. 1 cylinder in
firing position. Install distributor with the