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6.4
Section 6
Lubrication System
To service the blower housing mounted oil cooler,
clean the outside of the fins with a brush (see Figure
6-7). Remove the two screws holding the cooler unit
to the blower housing. Tilt the cooler downward as
shown in Figure 6-8. 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.
Figure 6-9. Oil Sentry™ Location.
On engines not equipped with Oil Sentry
™
the
installation hole is sealed with a 1/8-27 N.P.T.F. pipe
plug.
To install the switch, follow these steps:
1. Apply pipe sealant with Teflon
®
(Loctite
®
No.
59241 or equivalent) to the threads of the switch.
2. Install the switch into the tapped hole in the
breather cover. See Figure 6-9.
3. Torque the switch to 4.5 N·m (40 in. lb.).
Testing the Switch
Compressed air, a pressure regulator, pressure gauge
and a continuity tester are required to test the switch.
1. Connect the continuity tester across the blade
terminal and the metal case of the switch. With
0 psi pressure applied to the switch, the tester
should indicate continuity (switch closed).
2. Gradually increase the pressure to the switch. As
pressure increases through the range of
3.0/5.0 psi, the tester should indicate a change to
no continuity (switch open). The switch should
remain open as the pressure is increased to
90 psi maximum.
3. Gradually decrease the pressure through the
range of 3.0/5.0 psi. The tester should indicate a
change to continuity (switch closed) down to
0 psi.
4. Replace the switch if it does not operate as
specified.
Figure 6-8. Cleaning Blower Housing Mounted Oil
Cooler.
Oil Sentry
™
General
Some engines are equipped with an optional Oil
Sentry
™
oil pressure monitor switch. 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 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 “FULL”
mark on the dipstick. This includes engines
equipped with Oil Sentry™.
Installation
The Oil Sentry™ pressure switch is installed into the
breather cover. See Figure 6-9.
Oil
Sentry™