1919 Cadillac - GM Heritage Center

124 REMOVAL, INSPECTION AND REPLACEMENT
Inspection
INSPECTION OF ROTOR—The upper face of the rotor button should
be smooth and clean. If it is necessary to clean it use an oil stone.
Inspect the rotor spring for tension. In replacing the spring make
sure that it bottoms in the hole which receives it, otherwise the resulting
increased pressure will cause cutting in the distributor head.
Under a pressure of between five and ten ounces the rotor button
flange should just rest on the rotor.
INSPECTION OF OTHER PARTS Inspect the distributor head. (See
"Inspection" under "Distributor Head," page 123).
Inspect the timer contact points. If they are burned or pitted or
out of adjustment, see under "Adjustment of Timer Contact Points"
page 42.
Replacement
To replace the rotor, reverse the operation under "Removal," first
making sure that the shaft over which the rotor sets, as well as the hole
in the rotor which receives the shaft, is clean. If the rotor fits tightly
tap it lightly at the center with the wooden end of a screw driver.
DISTRIBUTOR AND TIMER
Removal
Remove the carburetor. (See "Removal" under "Carburetor,"
page 129).
Remove the generator shaft "A," Fig. 22.
Remove the coupling "C" from the rear end of the fanshaft. To
do so first remove the large cap screw "B," then remove the coupling
with a puller.
Remove the two cylinder head nuts which hold the brackets of the
left-hand high tension conduit. Loosen the small screws in the brackets
which hold the right-hand conduit. Remove the distributor head and
the low tension wire and lift the left-hand conduit with wires and head
over to the right side.
Remove the distributor rotor. This may be done by lifting it
straight up. If the rotor sticks on the shaft, force it off with two small
screw drivers. The rotor is recessed on the under side at two points to
receive drivers in removing. Lift both sides of the rotor evenly and
lift it carefully.
Remove the dowel pin "X," Fig. 34, by tapping it out from the
front.
Remove the spark control rod.
Remove the three bolts and two nuts which hold the distributor
and timer to the fan shaft housing.
REMOVAL, INSPECTION AND REPLACEMENT 125
The distributor and timer may now be removed by tapping it lightly.
As the dowel pin "Y" is still in position, care must be exercised to
remove both sides evenly.
Removal of Plain Bearing
Remove the cotter pins "G" and "H," Fig. 7, and the contact arms
"C" and "0," being careful not to bend the posts upon which the arms
operate.
Remove the nut "A," the resistance unit, and the condenser "D."
Remove the oiler "W."
Remove the screws "K" "L" and "M" and lift out the segment
plate "N."
LOCKING DEVICE FOR ALUMINUM CAP
ALUMINUM CAP
CENTRIFUGAL GOVERNOR^1
WEIGHT
MANUAL-
CONTROL
LEVER
O-GEAR ON
DISTRIBUTOR
SHAFT
TO SPARK PIU6S
TO IGNITION COIL
CENTER CONTACT
3
'CONTACTS CONNECTED
TO SPARK PLUGS
SCREW HOLOING
BRACKET TO CONDUIT
BRACKET FOR CONDUIT
DISTRIBUTOR HEAD
ROTOR
TIMER CAM-J
P B
Fig. Sh—Distributor and Timer, Sectional View.
RESISTANCE UNIT-E
A
-CONDENSER-D
GOVERNOR SPRING- L
FANSHAFT
GEAR ON FANSHAFT