TM 9-2815-225-34&P
3-93. ON-ENGINE FUEL PUMP ADJUSTMENT (Contd)
LOCATION/ITEM
ACTION
REMARKS
9.
Spring retainer (12)
Remove.
10. New shim(s) (13)
Add or remove from behind
Each 0.001 in. (0.025 mm) shim
spring (14). High speed adjust-
thickness will change speed
ment should be 2130 to
approximately two rpm.
2150 rpm.
11. Spring retainer (12) and
Install on guide (15).
Use snapring pliers. Make certain
snapring (11)
shim(s) (13) do not slip off of guide
(15).
12. Spring pack cover (9)
Secure with three captive
Tighten screws (6) and (8) to
washer screws (6), screw (8),
9-11 lb-ft (12-15 Nm). Screw (8)
and four washers (5).
has hole drilled through head for
sealing wire insertion.
d. High Idle Speed Adjustment
NOTE
Do not use this check to make governor speed adjustments. If no-load speed is much
greater than specifications, examine governor for malfunction or faulty parts.
13. Engine (1)
a. Operate to purge air from fuel
system and bring up to operating
temperature.
b. Bring to full throttle and hold.
Speed should be 10-12 percent
Note maximum rpm.
greater than governor speed
cutoff point. If on-engine fuel
pump adjustments made with
engine mounted in vehicle, rpm
will depend on engine parasitic
loads (fan, pumps, etc.).
e. Checking and Adjusting Fuel Rail
NOTE
It should not be necessary to adjust fuel rail pressure on a newly calibrated fuel pump
more than ± 2 psi (± 14 kPa). If adjustments greater than this are required, fuel pump test
stand, injector test stand, or engine problems may exist. Do not remove throttle shaft ball
unless fuel rail pressure adjustment needs to be performed.
The correct method of checking engine fuel rail pressure is with engine installed on a
chassis or engine dynamometer.
14. Governor speed cutoff
Check setting point.
Adjust, if necessary.
15. Fuel rail pressure gauge (19)
Install between fuel supply
elbow (18) on fuel pump assembly
(3) and female union tee (17).
16. Engine(1)
Bring to full throttle load until
Accurate tachometer must be
rpm falls to rated speed.
used to measure rpm.
17. Fuel rail pressure gauge (19) Note reading.
If pressure is above or below the
minimum specification, do step 18.
If OK, go to step 19.
3-694
|
|
