6.4
Section 6
Lubrication System
Service Oil Cooler
These engines are equipped with an oil cooler
mounted under the No. 2 side cylinder shroud,
separate from the oil filter. See Figure 6-9.
Figure 6-11. Cleaning Underside of Oil Cooler.
Oil Sentry™
General
Some engines are equipped with an optional Oil
Sentry™ oil pressure monitor switch. See Figure 6-12.
If the oil pressure drops below an acceptable level, the
Oil Sentry™ will either shut off the engine or activate
a warning signal, depending on the application.
The pressure switch is designed to break contact as
the oil pressure increases above 7-11 psi, and make
contact as the oil pressure decreases below 7-11 psi.
On stationary or unattended applications (pumps,
generators, etc.), the pressure switch can be used to
ground the ignition module to stop the engine. On
vehicular applications (lawn tractors, mowers, etc.)
the pressure switch can only be used to activate a low
oil warning light or signal.
NOTE: Make sure the oil level is checked
before each
use
and is maintained up to the “F” mark on
the dipstick. This includes engines equipped
with Oil Sentry™ .
Figure 6-9. Oil Cooler.
Inspect and clean the oil cooler every
150 hours of
operation
(more frequently under severe conditions).
In order to be effective, the oil cooler must be kept free
of debris.
To service the oil cooler, clean the outside of fins with
a brush, vacuum, or compressed air. If required,
remove the two screws holding the cooler unit to the
backing shroud asseembly. Carefully pull the cooler
outward and clean the underside. After cleaning,
reinstall the oil cooler to the backing shroud with the
two mounting screws.
Figure 6-10. Cleaning Top of Oil Cooler.
Oil
Cooler
Cylinder
Shroud
Pressure Switch
Figure 6-12. Oil Sentry™ Pressure Switch.
Oil
Cooler
