6.4
Section 6
Lubrication System
Installation
The pressure switch is installed into the center oil
galley of the filter adapter casting on the closure plate.
Based on the application an elbow adapter may also
be used. See Figure 6-9. On engines not equipped with
Oil Sentry
™
, the oil galley is sealed with a 1/8" pipe
plug or completely sealed.
Figure 6-9. Oil Sentry
™
Pressure Switch Locations.
To install the Oil Sentry
™
switch:
1. Remove and discard the pipe plug from the
center passage of oil filter mounting pad.
2. Apply pipe sealant with Teflon
®
(Loctite
®
No.
59241 or equivalent) to the threads of the 90°
adapter (if used), and the Oil Sentry
™
switch.
3. Install the adapter (if used), and carefully tighten
it to the intended position. Do not over tighten or
damage the adapter.
4. Install the switch into the adapter or center
passage. Torque the switch to 4.5-5.0 N·m
(40-45 in. lb.).
5. Connect the lead to the terminal on the Oil
Sentry
™
switch.
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; approaching 0 psi.
If the switch does not operate as specified,
replace the switch.
Testing Oil Pressure
On some models the engine oil pressure can be tested
using an oil pressure tester. Follow the instructions
included with the tester. The pressure can be tested by
removing the oil filter and installing the tester adapter
on the mounting pad, or by removing the Oil Sentry
™
pressure switch (or pipe plug) and threading the tester
hose directly into the mounting hole. See Figure 6-10.
Oil Sentry
™
(External)
Oil Sentry
™
(Behind
Blower Housing)
Locations
For Tester
Figure 6-10. Tester Locations (Some Models).
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