Toro GROUNDSMASTER 345 - Manual (Page 37)

TORO GM 325-D Mitsubishi K3D Diesel Engine
Notes
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35
Glow Plug Testing.
The diesel engine requires glow plugs to warm the combustion chamber to assist in starting. Evidence of faulty
glow plugs includes: hard starting, excessive smoke, or engine knocking.
There are several ways to test glowplugs.
The resistance of the glow plug can be measured with an Ohmmeter.
Normal resistance is 2 to 3 ohms.
0 ohms indicates a shorted glow plug.
An O.L. reading on the ohmmeter indicates an open circuit in the glow plug.
Another way to test the glow plugs is to remove the plug and connected it to a battery. If the glow plug ends turn
red, the glow plug is working.
A third test is to measure the amperage draw when the glow plug circuit is energized. The operating circuit
should draw 30 amps. (10 amps per glow plug)