Service Manual

Testing

Glow Plug Test (Fig. 16)

Be careful while handling or testing glow

plugs. Glow plugs become extremely hot. Ac-

cidental contact with the heated plug tip could

cause personal in ury.

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

Figure 16

end 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

plu

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

the plug body. If the glow plug glows red-hot, the glow

plug is operating correctly.

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

Testing P

age 4 - 18 Groundsmaster

300 Series