TM 5-3810-300-24&P-3
Shop Notes 2.0
1. An alkaline solution bath (180-212F or 82-100C)
It is extremely important that the parts be free of oil
to pre-clean.
before placing them in the bluing bath. Oil will produce a
varied color part.
2.
A hot or cold water rinse.
There are several important safety precautions to be
3.
The bluing solution bath.
followed for preparing and using the solutions. Protective
clothing such as rubber gloves, rubber arm covers,
4.
A cold water rinse.
rubber apron and protective face shield contribute to the
safety- of personnel carrying out the procedures. When
5. An engine lubricating oil bath (180-212F or 82-
preparing the solutions, the compounds should be added
100' C) to rust proof the parts. The bluing tank should be
to the water and not water added to the compounds.
a double walled, 1-1/2" insulated type of 10 gage steel.
The dipping tanks should be properly vented and all
fumes exhausted to the outside atmosphere. Since
The temperature of the bluing solution should be 295'F to
temperatures of the caustic solutions exceed the boiling
305F or 146C to 152C. The boiling point of the
point of water, any splashing encountered while adding
solution is directly related to its concentration. Therefore,
make-up water can cause serious burns. Always add
when the boiling point is too high, the solution is too
water slowly and with extreme care. When the parts to
concentrated and the volume of water is probably low.
be dipped are cold, caution should be taken to avoid
When this occurs, the boiling point can be reduced to
splashing that might occur when the cold parts come in
300'F (149' C) by water: The parts should be placed in
contact with the hot solutions. A heavy wire-screen type
the solution for 15 to 30 minutes.
basket, suitable for holding a quantity of injector bodies,
is recommended for dipping the parts in the solutions.
FUEL LINES
Flexible fuel lines are used to facilitate connection of
When installing fuel lines, it is recommended that
lines leading to and from the fuel tank, and to minimize
connections be tightened only sufficiently to prevent
the effects of any vibration in the installation.
leakage of fuel; thus flared ends of the fuel lines will not
become twisted or fractured because of excessive
Be sure a restricted fitting of the proper size is used to
tightening. After all fuel lines are installed, run the
connect the fuel return line to the fuel return manifold.
engine long enough to determine whether or not all
Do not use restricted fittings anywhere else in the fuel
connections are sufficiently tight. If any leaks occur,
system.
tighten the connections only enough to stop the leak.
Also check the filter cover bolts for tightness.
LOCATING AIR LEAKS IN FUEL LINES
Air drawn into the fuel'system may result in uneven
improper fuel line connections such as a fuel pump
running of the engine, stalling when idling, or a loss of
suction line connected to the short fuel return line in the
power. Poor engine operation is particularly noticeable
fuel tank which would cause the pump to draw air.
at the lower engine speeds. An opening in the fuel
Presence of an air leak may be detected by observing
suction lines may be too small for fuel to pass through
the fuel filter contents after the filter is bled and the
but may allow appreciable quantities of air to enter.
engine is' operated for 15 to 20 minutes at a fairly high
speed. No leak is indicated if the filter shell is full when
Check for loose or faulty connections. Also check for
loosened from its cover. If the filter shell is only partly
full, an air leak is indicated.
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