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 - Page 392 of 894
TRUCK SERVICE MANUAL
ENGINE
The intake air system group consists of intake manifolds,
Intake
Air System
connections, air cleaners, piping, cold-starting aids, and
turbochargers.
The turbochargers are covered in separate
Group 10
manuals.
INTAKE MANIFOLDS AND CONNECTIONS
CLEANING AND INSPECTION
1.
Clean intake manifold or air connection with steam.
2.
Inspect for chips, cracks, distortions and damaged
threads.
Discard unusable parts.
3.
Damaged threads may be repaired by installing Heli-
Coils.
COLD-STARTING AIDS
Preheater
Due to the lower compression ratio of turbocharged
engines, they may not start unaided below 50 deg.
F [10
deg.
C].
For this reason, the glow plug cold-starting aid
is supplied as standard on these engines.
This aid uses engine fuel which is pressurized by a hand
pump and atomized in a nozzle in the intake system.
The
atomized spray is ignited by the glowing coil of the glow
plug and provides sufficient heat for combustion of fuel in
the cylinders.
Fuel supply should be obtained from fuel tank.
If this is
impractical, supply may be taken from pipe plug in center
bottom of fuel pump housing or by a connection in engine
fuel supply line.
These methods are not desirable due to
possible deterioration of hand pump seals which may
allow air to be pulled into engine fuel system.
Preheater Servicing
1.
Remove preheater adapter (6, Fig.
10-1) and glow
plug (1) from intake manifold.
2.
Remove nozzle (2) and clamping washer (5) from
adapter (6).
3.
Clean adapter and nozzle with Bendix carburetor
cleaner, or equivalent.
Be sure nozzle screen (3, Fig.
10-1) and spray holes are open and clean.
Check "O"
ring (4) for damage.
4.
Check glow plug on 6-volt or 12-volt source, as
applicable.
CAUTION
6 and 12-volt plugs are not interchangeable.
5.
Assemble clamp washer (5, Fig.
10-1) and nozzle (2)
to adapter (6).
6.
Tighten nozzle to 15 to 20 ft-lbs [2.1 to 2.8 kg m] and
bend washer over one of hexagonal sides of nozzle.
7.
Install assembled adapter in intake manifold.
Ether-Starting Aids
A pressurized spray can or a rag wet with ether will
usually provide quick starting as low as -10 deg.
F [-23
deg.
C] .
Below this temperature, some means of
injecting a carbureted ether vapor directly into intake
manifold is necessary.
CAUTION
Do not attempt to use ether compound type starting
aids near heat, open flame or on engines equipped
with glow plug system.
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