TM-9-2815-213-34
ENGINE, DIESEL, WITH ACCESSORIES CUMMINS MODEL V8-300 (2815-910-8217)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING DIRECT SUPPORT AND GENERAL SUPPORT REPAIR PARTS LIST AND DEPOT MAINTENANCE ALLOWANCES)
FEBRUARY 1972
TM-9-2815-213-34 - Page 57 of 192
*TM 9-2815-213-34
(1) Install factory calibrated master injec-
tor gage (36, fig.
B-28), in test stand to adjusting
other injectors for fuel delivery.
CAUTION
The master injector must never be tam-
pered with.
(2) Fill hydraulic fluid reservoir.
(3) Test oil tank on stand must be kept at
least ye full of diesel fuel.
(4) Aline timing mark (fig.
3-60) and close
hydraulic valve and open the air valve (fig.
3-61).
Place load cell tester (1, fig.
B-29) in test stand
and clamp in place by opening hydraulic valve
(fig.
3-61).
CAUTION
Never operate test stand with load cell
in position.
(5) Adjust air pressure by turning knurled
button on air regulator until the load cell indi
cates within marked band on load cell gage (0
3-62).
Lock knurled button in place with lock-
nut.
Note air gage pressure (gage at top
hydraulic reservoir).
(6) Remove load test gage by opening ]
draulic valve and returning air valve knob center
position.
With cylinder rod in down posi- tion, check
to make sure hydraulic fluid shows hydraulic oil lever
sight bulb.
(7) Open air valve.
While cylinder rod is at
the top of its travel, check to make sure there no air
in hydraulic fluid sight glass.
(8) Make sure injector seat contains 0.0
inch restrictor orifice when calibrating test stand.
(9) Place injector adapter (fig.
3-63) o~
master injector and engage locators in inject
mounting holes.
Make sure seat is retracted a timing
marks are alined at timing wheel.
(10) Position test stand link (marked NV NH,
H) over injector plunger link and place adapter and
injector assembly in injector se tip back until link is
below machine push rod.
necessary adjust bracket
so link is alined but r rubbing.
NOTE
Turn injector plunger so that class size
marking on top of spring retainer is midway
between inlet and drain connec- tions.
(11) Open air valve (fig.
3-61) and as
jector goes in clamped position make sure plunk
link is properly alined and engaged in link gui
(12) Check air gage pressure at top of ]
draulic reservoir as originally established with load test cell.
Close hydraulic valve (fig.
3-61) to lock injector in clamped
position.
Connect inlet and drain connectors (fig.
3-64) to
injector.
(13) Start test stand motor and allow to run until fuel
temperature reaches a minimum of 80 degrees.
(14) Adjust fuel pressure by turning pressure
regulator knob until fuel pressure gage
shows 120 psi.
If this pressure can not be achieved, the
trouble probably is due to a sticking air regulator, or to a worn
gear pump.
Pres.
sure of 120 psi must be maintained at all
times during calibration and testing.
(15) All counter wheels (fig.
3-60) must be set at
zero (0) as a starting point.
(a) Shift silver-colored counter wheels to right, rotate as
necessary then release them to indicate 1020 strokes.
Rotate empty vial into position by turning vial knob.
(b) Clear counter by rotating with thumb screw until all white
counter wheels show zero.
(16)
Engage
counter
and
divert fuel to vial for measurement by pressing and releasing
red flow start switch.
(17) Stir fuel with a rod to settle out foam.
Check
amount collected in vial at end of 1020 counter strokes.
(18) Look directly into vial at fuel level to avoid
parallax.
If this reading shows 129 cc which is 3 cc below
correct injector master de livery specifications (132 cc @ 120
psi.), or an- other value, repeat test.
(19) Dump fuel from vial and repeat test at least
twice to insure consistent results.
(20) If 3 cc low, it will be necessary to set counter up
to approximately 1043 strokes or
about 71/2 strokes for each cc.
Roll counter back,
all white counter wheels must show zero (0).
(21) Repeat
tests and adjust counter as necessary to obtain 132 cc
delivery at 120 psi.
with fuel temperature at 80 degrees to
100 degrees Fahrenheit while master injector is in test stand.
Check readings for three cycles to insure repeatability, at this
point test stand is correctly
calibrated.
(22) Remove master injector from test
stand.
c.
Injector Spray Pattern Check.
(1) Locate injector spray angle tester (6, fig.
B-29)
on or near injector test stand (fig.
3- 59) or other source of
50 p.s.i.
constant fuel pressure, so that injector inlet
connection of test stand will reach injector to be checked.
Use injector test oil or diesel fuel to perform test.
3-28
Back to Top
