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ELECTRICAL
the gasket, then using a proper fitting socket wrench,
CAUTION: Before adjusting gap, file
tighten 2/3 additional turn.  Care must be exercised
center electrode flat. In adjusting the
when tightening.
spark plug gap, never bend the
center  electrode  which  extends
3.
Spark  plugs  which  are  not  tightened
through the porcelain center as this
correctly will result in too high an operating temperature
may  break  the  lower  insulator.
if too loose, or distortion of the spark plug body and
Always
make
adjustments
by
change in gap setting or damage to the gasket if too
bending  the  ground  or  side
tight.
electrode. (Fig. 43)
CHECKING GAUGES AND INDICATOR LIGHTS
A. GENERAL
Do not remove any unit from the truck unless it is known
to be defective.
Check wiring, connections and indicator lights before
condemning any unit.
B. ENGINE OIL PRESSURE AND HYDRAULIC OIL
The transmission temperature warning light should be
checked periodically for good connections and lighting
ability.
Although the oil pressure gauge functions normally, the
oil pressure should be checked to help determine engine
condition.
Substitute an oil pressure gauge for the oil pressure
sending unit, to determine the oil pressure.
C. CHECKING GAUGES
Figure 43.
Before checking a gauge or sending unit, make sure all
D. INSTALLATION
electrical connections are tight and free of dirt or
moisture.
1.
Be certain that the old gasket is removed
before installation of plug, and that the gasket seat is
Wiring should be checked for broken or frayed insulation
clean and smooth.  Check also that the spark plug
which may cause a short or ground in the circuit.
threads and the cylinder head threads are not dirty or
damaged.  Dirty or damaged threads cause a faulty
Any of these causes may have been the reason for
torque reading, resulting in incorrect installation and
failure.
consequent poor spark plug life and faulty operation.
The following equipment is necessary to make a
2.
Install the spark plugs in the engine with
complete check of these gauges:
new gaskets and tighten.  If torque wrench is not
available, turn plugs in until they are finger-tight against
B-86

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