1975 Datsun 280z FSM - Spooled up Racing

Engine Tune-up
INSPECTION AND
ADJUSTMENT
PHASE DIFFERENCE
1. Disconnect engine harness red
wire connector from water temperature
switch.
2. Ground engine harness red wire
terminal to engine with a suitable lead
wire.
Fig. ET-37
Adjusting phase difference
2. Checking "ON" of water temperature
switch. Starting water temperature
from 50°C (122°F) and below,
check continuity of water temperature
switch to ensure that reading remains
zero until a water temperature rises to
57°C(134°F).
3. Checking "OFF" of water temperature
switch.
Increasing water temperature from
about 50°C (122°F), make continuity
check of water temperature switch.
Operation is normal if an ohmmeter
reading is infinite, at water temperature
somewhere between 57 to 63°C
(134 to 145°F) and remains infinite at
above 63°C(145°F).
Fig. ET-36 Short-circuit of
advance control relay
\ - EE224
Fig. ET-38 Phase difference
adjusting scale
3. With engine idling, adjust ignition
timing by rotating distributor to
specifications.
4. With engine harness red wire connector
disconnected from water temperature
switch, idle engine. Check to
determine that phase delay is 6 degrees
in terms of crankshaft angular displacement.
To correct proceed as follows:
(3) Make sure that the ignition
timing of advance side meets specifications.
(4) After adjustment, connect water
temperature switch harness.
WATER TEMPERATURE
SWITCH
Water temperature switch is located
at the thermostat housing of engine.
Fig. ET-40 Checking water
temperature switch
4. If it is satisfied both in steps 2
and 3 above, switch is good.
RELAY
The relay which controls the operation
of dual pick-up coil is installed on
the right side of the engine compartment,
on the relay bracket at the
wheel housing.
(1) Referring to Figure ET-37, turn
out adjuster plate screws 1/2 to 2
turns. The screws are located at pickup
coil assembly on retarded side.
(2) Turn adjuster plate until correct
phase difference is obtained.
Ignition timing is retarded when
plate is turned counterclockwise.
EC360
Note: Refer to graduations on breaker
plate to make adjustment easier.
One graduation corresponds to a
crankshaft angular displacement of
4 degrees.
Fig. ET-39
Water temperature
switch
1. A thermometer and ohmmeter
are needed to check water temperature
switch.
Fig. ET-41 Relay
L
ET-16