3-78 2007 Buell Lightning: Engine
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OIL PRESSURE INDICATOR SWITCH 3.12
GENERAL
The oil pressure indicator switch is a pressure-actuated dia-
phragm-type switch. When oil is not circulating through the
system or when oil pressure is low, spring tension holds the
switch contacts closed, thereby completing the signal light cir-
cuit and causing the indicator lamp to illuminate.
OIL PRESSURE SIGNAL LIGHT
The oil pressure signal light turns ON when:
●
Ignition switch is turned on prior to starting engine.
●
Oil is not circulating through the running engine.
●
Oil pressure is abnormally low in the running engine.
●
Engine is idling below 1000 RPM.
The oil pressure signal light turns OFF when:
●
Oil is circulating with adequate pressure through the
engine running at 1000 RPM or greater.
Troubleshooting information is listed in Table 3-24.
NOTE
If the ignition is turned back on immediately after the engine
is stopped, the oil light may not turn on right away because of
oil pressure retained in the filter housing.
OIL PRESSURE
See Figure 3-112. The oil pump is non regulatory and deliv-
ers its entire volume of oil under pressure to the oil filter
mount. When an engine is cold, the engine oil will be more
viscous (i.e., thicker).
When an engine is operated at high speeds, the volume of oil
circulated through the oiling system increases, resulting in
higher oil pressure. As engine speed is reduced, the volume
of oil pumped is also reduced, resulting in lower oil pressure.
1. Remove cable strap securing oil pressure wiring to oil
pressure switch.
2. See Figure 3-112. Unplug connector (2) from oil pres-
sure indicator lamp switch (1) located on top of the oil fil-
ter mount (3). Remove oil pressure switch by using OIL
PRESSURE SENDING UNIT WRENCH, unscrew and
remove oil pressure switch from crankcase.
3. See
Figure 3-113.
Install OIL PRESSURE GAUGE
ADAPTER (Part No. HD-96925-58) (2) in oil pressure
indicator lamp switch mounting hole. Tighten adapter
snugly. DO NOT OVERTIGHTEN.
s
Figure 3-112. Oil Pressure Indicator Switch
Table 3-24. Troubleshooting Oil
Pressure Signal Light
OIL
PRESSURE
SIGNAL
LIGHT
PROBABLE CAUSES
Stays on at
speeds above
idle.
●
Empty oil reservoir.
●
Clogged feed line (ice and sludge,
freezing temperatures).
●
Air-bound oil line.
●
Grounded oil switch wire.
●
Malfunctioning signal switch.
●
Diluted oil.
●
Malfunctioning check valve (see
3.16 OIL FILTER MOUNT).
Flickers at idle.
●
Incorrect idle speed. Malfunction-
ing or improperly installed check
valve (see 3.16 OIL FILTER
MOUNT).
Does not glow
when ignition
is turned on
(prior to oper-
ating engine).
●
Malfunctioning signal switch.
●
Malfunction in wiring.
●
Burned-out signal bulb.
●
Dead battery (see NOTE).
b1032b3x
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