TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980
TM-5-3805-254-14-P-2

  TM-5-3805-254-14-P-2 - Page 550 of 894

TRUCK SERVICE MANUAL
FUEL SYSTEM
5.
Apply a thin coat of Permatex Aviation Forma gasket
around cover O.D.
and drive it into housing by tapping
uniformly around rim until flange contacts housing.
Note:
Do not drive or press against cupped portion of cover.
Distortion will cause binding of shaft, Part No.
140358.
6.
Retail with oil after mounting an engine.
Maintenance, Trouble Shooting And Repair
Maintenance
1.
Assure that body is initially filled with oil of same
grade as that used in engine.
2.
Check oil level and replenish every 2
nd
or 3
rd
engine
oil change period.
A.
If evidence of rust appears in drained oil, remove
aneriod from engine.
B.
Remove pressed side cover and wash cavity with
solvent.
C.
Install
as
previously
described
in
“O”
ring
replacement.
3.
Occasionally check to determine if oil leakage is
occurring
at bottom adjusting screw or side cover, Part No.
114773.
4.
Replace the aneroid bellows at 125,000 to 150,000
miles 1200 000 to 240 000 km].
5.
Every 30,000 to 50,000 miles [48 000 to 80 000 km],
replace breather.
Torque
to
10 to 13 ft-lbs.[14 to 18 N.
m .
Trouble Shooting
Engine Will Not Start
Aneroid starting check valve may be stuck open.
1.
Disconnect intake manifold to aneroid air line at
aneroid. Used a pencil or rod of suitable length to depress the
aneroid piston fully.
Have someone attempt to start the
engine.
2.
If engine starts, aneroid check
valve is stuck open.
Remove, clean and polish check valve with crocus cloth.
Check for binding In bore.
Replace new style valve.
3.
If engine
does
not start, when
aneroid
piston is
depressed, aneroid is not
fault.
Excessive Acceleration Smoke
1.
Engine fuel rate will be excessive if pump calibration
is above specs.
2.
Aneroid check value stuck close.
a.
Disconnect aneroid fuel outlet line at aneroid and
plug end.
Attach a hose at aneroid i outlet connection and run
into a bucket.
Start engine and observe for fuel discharge
from hose as engine no load speed is increased.
Fuel should
be discharged at or slightly above idle (600 rpm).
See Table
5-2-3 for starting check value opening pressure
b.
If no fuel is discharged, replace new style valve or
remove, clean and polish starting check valve.
Check for
binding in bore.
c.
Disconnect air line at top of aneroid.
With a pencil or
rod of suitable length, determine if piston is stuck down
If so,
remove aneroid and repair.
d.
If fuel is discharged, check valve is riot at fault.
3.
Obstruction in aneroid hoses or fitting.
Check for unauthorized tampering that renders the aneroid
ineffective.
4.
Aneroid "fuel pressure" setting too high.
5.
Aneroid air actuation pressure too low.
a.
Wrong spring in use (too tight).
b.
Aneroid spring shimmed too lightly or 2 piece shaft
too long.
6.
High altitude.
"Aneroid" fuel pressure setting should be reduced.
Low Power
If exhaust smoke is dense, at full power, aneroid is not at fault.
1.
Aneroid "fuel pressure" setting too low.
Check for tampering.
2.
Aneroid air actuation pressure too high.
Check for tampering. Check for air leaks between aneroid
cover and bellows.
3.
Aneroid bellows ruptured.
Remove breather and apply 20 psi [138 kPa] maximum air
pressure at aneroid air inlet.
If continuous air leakage is noted
at breather hole, bellows is ruptured.
4.
Breather plugged.
Clean or replace.
5.
Aneroid piston and
linkage mechanism
stuck
In up
position.
With a pencil or rod of suitable length inserted through aneroid
air inlet opening, check for piston, aneroid shaft or linkage
binding.
An indented pressed side cover will rub valve lever.
Air In Fuel System
1.
"0" ring, Part No.
114791 leaking.
a.
Disconnect aneroid air inlet line and impose
restriction on gear pump suction.
Attach manometer at
breather opening or otherwise determine if vacuum is being
drawn In
545


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