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 78 of 192
*TM 9-2815-213-34
Figure 3-90.
Main throttle shaft shim check.
g
.
Calibration Procedure (Flow Meter Method:
CAUTION
Test stand motor switch is marked "RE-
VERSE"
and "FORWARD." For all
testing of this pump the stand switch
must
be set to the "FORWARD"
position.
This corresponds
to
the
rotation requirements of "L" on the pump
name- plate (fig.
3-84).
Refer to
paragraph 3-104.d.
(1).
(1
) Check Pump Seals.
(a)
With test stand operating at 5C rpm
(throttle wide open) close control valve in fuel pump
suction line till vacuum gage reads 1 inches vacuum.
The fuel flow control or need valve should be open
during this check.
(b)
Put a small amount of Lubriplate ( light
cup grease over the vent or "weep" hole main shaft seal
bore of fuel pump front cover (fig.
3-91).
(c)
If the lubricant is sucked into the ho at
the 15-inch vacuum setting, it is an indicate that the seal
will not permit proper fuel pun performance and should
be replaced.
(d)
Perform the above check on the throttle
shaft to check the shaft O-Ring.
App lubricant at the
throttle.
(e)
Remove tachometer cap and fill the
tachometer seal bore with test fuel from the stand. If the
fuel is drawn into the pump,
r place the seal.
NOTE
During the above checks observe the
flow meter for the presence of air
bubbles. Air bubbles are an indication of
air leakage into the system.
Check the
line connections between tank
and
pump for tightness.
Check for proper
mating of gear pump to pump housing.
Insure that fuel supply tank is full.
(2
) Adjust Vacuum.
(a)
Open test stand flow control valve
completely.
(b)
Increase pump speed to 100 rpm below
engine rated speed of 3000 rpm.
(c)
Adjust control valve in fuel pump suction
line to obtain 8 on vacuum gage (fig.
3-80).
(3
) Set Pump Flow.
(a)
Set pump speed to 3000 rpm.
(b)
Close flow control valve (fig.
3-80) until
flow meter registers 540 p.p.h.
(c)
There must be no air bubbles visible in
the flow meter.
NOTE
Disregard change in vacuum meter
readings.
(4
) Set Ground Speed.
(a)
With throttle wide open,
increase pump
speed to point where fuel pressure just begins to
decrease (peak point). This should occur at speed of
3020 to 3040 rpm.
Check speed twice as fuel pump
tachometer drive is turning at /2 engine speed.
(b)
If peak point speed is lower than
specified,
add shims (fig. 3-92) between governor
spring and retainer. To reduce speed,
remove shims.
Each 0.001 inch shim thickness will change speed
approximately 2 rpm.
(5
) Set Throttle Leakage.
(a)
Insure that flow-meter reading is 540
Figure 3-91.
Weep hole leakage.
3-49
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