6.5
Section 6
Lubrication System
6
Installation
The pressure switch is installed in the oil fi lter
adapter, in one of the main oil galleries of the oil pan.
See Figure 6-10. On engines not equipped with Oil
Sentry
™
, the installation hole is sealed with a 1/8-27
N.P.T.F. pipe plug.
Figure 6-10. Oil Sentry
™
Pressure Switch.*
*NOTE: Some engines use adapter without oil drain
plugs or provision for Oil Sentry
™
.
To install the Oil Sentry
™
switch to the oil fi lter adapter
of oil pan:
1. Apply Loctite
®
No. 59241 pipe sealant with
Tefl on
®
(or equivalent) to the threads of the
switch.
2. Install the switch into the tapped hole in oil fi lter
adapter.
Torque the switch to 6.8 N·m (60 in. lb.).
Testing the Oil Sentry
™
Switch
The Oil Sentry
™
pressure monitor is a normally-closed
switch. It is calibrated to open (break contact) with
increasing pressure and close (make contact) with
decreasing pressure, within the range of 2.0/5.0 psi.
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.
The tester should indicate a change to no
continuity (switch open) as the pressure
increases through the range of 2.0/5.0 psi.
The switch should remain open as the pressure is
increased to 90 psi maximum.
3. Gradually decrease the pressure to the switch.
The tester should indicate a change to continuity
(switch closed) as the pressure decreases
through the range of 2.0/5.0 psi.
If the switch does not operate as specifi ed,
replace the switch.
Testing Oil Pressure
The engine oil pressure can be tested using the oil
pressure tester described in Section 2. Follow the
instructions included with the tester. The pressure can
be tested by removing the oil fi lter and installing the
tester adapter on the fi lter pad, or by removing the Oil
Sentry
™
pressure switch (or pipe plug) and threading
the tester hose directly into the hole. See Figure 6-10.
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