109823_2/09 5-3
2. Using an ohmmeter, touch one test probe to the glow
plug electrode. Touch the other test probe to the
glow plug body (see page 5-3, Fig. 5-7).
3. Observe the ohmmeter. A resistance reading of 1.0
ohm is maximum for the standard glow plug. If the
resistance is higher than 1.0, the glow plug is
defective and needs replaced.
Installation
1. Thread the glow plugs into the engine cylinder head.
Torque each glow plug to 11.1–14.8 lb
f
•ft (15-20
N•m) {1.5–2.0 kg
f
•m}.
2. Install the electrode bar,
, and the washers onto
the glow plugs. Secure with the three (3) nuts,
.
3. Connect the negative (–) battery cable to the battery.
Engine Oil Pressure Switch
Description and Location
The engine oil pressure switch,
( page 5-3, Fig. 5-8), is
located in the front of the engine cylinder head.
The engine oil pressure switch closes (circuit completed)
when engine oil pressure is less than 4.25 psi (29.4 kPa).
This illuminates an indicator light on the instrument panel.
The closed engine oil pressure switch will be opened after
the engine is started. If the switch does not work after
started, the oil level inside the engine may be low or there
may be a problem with the oil pump.
Engine Oil Pressure Switch Testing
1. Using an ohmmeter, touch one test lead to the
pressure switch terminal,
( page 5-3, Fig. 5-9),
and the other test lead to the threads of the switch
body,
( page 5-3, Fig. 5-9).
2. Observe the ohmmeter. There should be little or no
resistance, indicating continuity in the switch. If there
is no continuity, the switch is defective and needs
replaced.
Caution: Do not use high-pressure compressed
air for the following test, otherwise
damage may occur to the oil pressure
switch.
Note: The following test is not a calibrated test.
The purpose of the test is to see if the
switch contacts open at pressure.
3. While the test leads are connected to the switch,
pressurize the switch oil pressure port
( page 5-3,
Fig. 5-9), with low pressure 10.0–20.0 psi(69–138
kPa) {0.7–1.4 kgf/c
2
} compressed air.
4. Observe the ohmmeter. While air pressure is being
supplied to the oil pressure port, the ohmmeter
should indicate high resistance, or no continuity. If
there is continuity, the switch is defective and needs
replaced.
Installation
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