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