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6.4
Section 6
Lubrication System
Figure 6-7. Oil Coolers.
Inspect and clean the oil cooler every 100 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 crankcase mounted oil cooler, clean off
the outside fins with a brush or with compressed air.
To service the blower housing mounted oil cooler, clean
the outside of fins with a brush. Remove the two screws
holding the cooler unit to the blower housing. Tilt the
cooler downward. Clean the inside of the cooler with a
brush or with compressed air. After cleaning, reinstall
the oil cooler to the blower housing with the two
mounting screws.
Oil Sentry
™
General
Some engines are equipped with an optional Oil
Sentry
™
oil pressure monitor switch. See Figure 6-8. If
the 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 3-5 psi, and make
contact as the oil pressure decreases below 3-5 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
™
.
Installation
The Oil Sentry
™
pressure switch is installed in the
breather cover. See Figure 6-8.
Service Oil Cooler
Some engines are equipped with an oil cooler. One
style of oil cooler mounts on the engine crankcase and
has the oil filter on it. The other style of oil cooler is
mounted on the blower housing, separate from the oil
filter. See Figure 6-7.
Blower Housing
Mounted Oil Cooled
Crankcase Mounted
Oil Cooler
Figure 6-8. Location of Oil Sentry
™
Switch (or pipe
plug).
On engines not equipped with Oil Sentry
™
the
installation hole is sealed with a 1/8-27 N.P.T.F. pipe
plug.
Breather Cover
Oil Sentry™
Switch