Service Manual

Testing

Glow Plug Test

CAUTION

Be careful while handling or testing glow

plugs. Glow plugs become extremely hot. Ac-

cidental contact with the heated plug tip could

cause personal injury.

1. Disconnect the wire lead(s) to the glow plug.

2. Remove the glow plug.

3. Inspect the glow plug for signs of a burnt glow plug

d tube.

NOTE: If the metal of the glow plug end is melted, it is

a sign of cylinder overheating. (See Engine Overheats

in the Troubleshooting section of this chapter.)

4. Connect the positive (+) battery terminal to the glow

ug terminal, and the negative (–) battery terminal to

the plug body (Fig. 15). If the glow plug glows red-hot,

the glow plug is operating correctly.

5. Replace any glow plugs that do not operate correctly.

Figure 15

Liquid Cooled Diesel Engine Page 4 - 18 Workman 3300-D/4300-D