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ENGINE ELECTRICAL
6D-37
OFF-CAR CHECK OF THERMAL
VACUUM SWITCHES
Thermal vacuum valves open, close, or switch vacuum
sources when the calibration temperature is reached. The
following general checking procedures can be used for all
thermal vacuum valves. Refer to the illustrations on the
following pages for TVS identification, usage, and calibration
temperatures.
1. Allow TVS to cool below calibration temperature.
2. Connect vacuum gage(s) to output port(s) of the TVV
and apply vacuum signal to the source port(s) of the TVV.
3. Compare vacuum gage reading(s) to the correct
reading(s) indicated in the TVS illustration.
4. Heat TVS to a temperature above the calibration
temperature. Never apply a torch or open flame directly to
the TVS.
5. Compare vacuum gage reading to the correct reading
indicated in Fig. 6D-37.
IGNITION SWITCH
For removal and replacement procedures, refer to
Steering Section 3B.
SPARK PLUG WIRES
Use care when removing spark plug wire boots from
spark plugs. Twist the boot 1/2 turn before removing, and
pull on the boot only to remove the wire.
It is extremely important when replacing plug wires to
route the wires correctly and through the proper retainers.
Failure to route the wires properly can lead to radio ignition
noise and crossfiring of the plugs, or shorting of the leads to
ground.
Refer to Figures 6D-43, 6D-44, 6D-45 and 6D-45A for
proper spark plug wire routing.
Fig. 6D-45A Spark Plug Wire Routing
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1 4 0 L-4
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