(3) Connect the electrical lead to the chip detect-
or and ground the case of the chip detector to the
(4) Using a screwdriver, short across the gap
between the pole piece and the magnet and observe
ENC. CHIP DET indicator light. If light is on, circuit
and detector test good.
(5) If ENC. CHIP DET indicator light does not
illuminate, check that case is grounded to engine. If
light is still not observed, remove electrical connector
from chip detector and ground connector to engine.
ENC. CHIP DET indicator light should illuminate. If
light does illuminate replace chip detector; if light does
not illuminate, check circuits for continuity and
replace defective parts.
(6) Reinstall chip detector.
(7) Reinstall electrical connector to chip detec-
(8) With engine running, check the magnetic
chip detector light; the light should be out.
5-25 Oil Filter.
(1) Remove the nuts (1, figure 5-11) and washers
(2). Remove cap (3) with preformed packing (4) from
housing (9) located on top of engine.
(2) Use a clean suction gun or another suitable
device to remove the puddled oil from within the filter
housing (9) before removing the filter element (5). Do
not damage the filter element. Examine sediment for
evidence of metal particles.
(3) Remove the filter element (5) and pre-
formed packing (6). Discard the preformed packing.
(4) Install the cap (3) with preformed packing
on housing to prevent dirt from entering the housing.
Use ultrasonic cleaning equipment if avail-
Some engine bearings have silver-plated sepa-
rators, If minute silver particles are found in
the engine oil filter, clean and reinstall the
filter. Minute silver particles are due to normal
bearing wear and are not cause for corrective
(1) Agitate filter element in solvent (item 3,
table 2-2) until clean.
(2) Air dry filter element.
(3) Thoroughly clean the oil filter cavity of all
residual oil and/or sludge prior to the installation of a
cleaned or new filter element. If metal particles are
present remove and examine magnetic plugs in gear
(1) Remove cap (3, figure 5-11 ) with preformed
packing from housing. Discard preformed packing.
Clean cap with a clean lint-free cloth. Install new pre-
formed packing (4) lubricated with engine oil (item 7 or
8, table 2-2) on filter cap.
(2) Install new preformed packing (6) and
cleaned filter element (5) in filter housing (9).
(3) Install filter cap (3).
(4) Tighten nuts (1) which secure filter cap to
housing to 40-45 in. lb.
d. Testing. After the filter element has been
cleaned or replaced, run the engine for a short duration
and check the splitline for leaks.
5-26. Oil Pressure Regulator.
Do not remove the pressure regulator unless the
oil pressure cannot be adjusted within limits.
a. Removal. Remove lockwire and turn guide (14,
figure 5-11) out of housing (9). Remove spring (17) and
poppet (18) from the housing. Discard preformed pack-
(1) Lubricate preformed packing (16) with oil
(item 7 or 8, table 2-2) and place on guide (14).
(2) Install poppet (18), spring (17), and guide
(14) in housing (9). Turn the guide in until it bottoms;
then back it out 5 ½ turns.
(3) Adjust the regulating valve as outlined in
(1) Check the external condition of the reg-
ulator; ensure that the regulator is lockwired. If the
regulator is not lockwired, check the adjustment as
outlined in step e.
(2) If oil pressure cannot be adjusted within
limits, remove the regulator. Check for a broken spring
(17) or evidence of poppet (18) sticking. Check for
damage or wear on the poppet seating surface.
Oil pressure limits apply to an engine that is at
normal operating temperature.
(1) With the engine running at ground idle,
check that the oil pressure is 50 psig minimum.
(2) With the engine operating at maximum
speed, check that the oil pressure is within limits.
(Refer to table 10-1.)
Any adjustment made to the oil pressure reg-
ulator should be verified by a calibrated direct-
reading pressure gage connected at the oil pres-
sure sensing port on the front of the gearbox.