(1) Tag and disconnect electrical lead at glow
b. Cleaning, Inspection, Test and Repair.
plug from precombustion chamber. Remove
(1) Clean electrical lead and glow plug with a
rag dampened in an approved cleaning solvent and dry
counterclockwise with wrench on wrenching surface until
threads are disengaged then lift glow plug from
(2) Visually inspect electrical lead for cracked
precombustion chamber. Remove remaining plugs in a
or deteriorating insulation,. or loose terminals. Inspect
glow plug for visible signs of short circuit (discoloration),
or' other damage.
(3) Use an ohmmeter, place probe at each
end of lead and test for continuity. Replace a defective
(4) Use an ohmmeter, place negative probe
at threads and positive probe at glow plug terminal, then
test for continuity. Replace a defective glow plug.
In absence of an ohmmeter the glow
plug may be tested by grounding
threads at cylinder head, attaching
known 24 vdc hot lead at glow plug
terminal. If heat cannot be felt at tip,
or plug fails to glow, it is defective
and must be replaced.
(1) Install glow plug (fig.
Figure 3-127. Glow plug, removal and installation
precombustion chamber by turning clockwise until
threads are seated finger tight.
(2) Use torque wrench on wrenching surface
and tighten to between 10 and 12 ft-lbs.
(3) Connect electrical lead and remove tag.
(4) Install remaining glow plugs in a similar