Section V. TESTING
pressure tank from the M2A1-7 flamethrower or a similar
3-21. General
3
volume (208 + 3 in. ).
Connect pressure gauge.
Observe pressure in air bottle.
Before installation of the compressor assembly
on the gasoline engine, test runs of the compressor
b. Brush all seams and connections with a soap
assembly must be performed. The type test to be
solution and check for leakage during pump-up.
performed is dependent upon the replacement
performed during overhaul.
c. The compressor is required to pump-up the
system to 2,000 psig in 5 1/2 minutes when operated at
Note. If gasoline engine group is not
3,600 rpm maximum.
available, mount the compressor on a
unit capable of operation at speeds
d. No leakage is permissible.
ranging from 0 to 3,600 rpm.
3-24. Blow-by Test
3-22. Run-In
a. Operate the compressor at a regulated
a.
Run-in is a test which is performed
pressure of 2,000 psig under ambient air conditions until
immediately after final assembly.
the operating temperature stabilizes.
b. The compressor assembly is run for a
minimum of 2 hours as follows: (Conduct all tests at
b.
Measure blowby at the crankcase oil filler
ambient pressure and temperature.)
pipe.
(1) Remove intake filter, first stage, and
c. Blowby must not exceed 0.07 scfm at 80 F.
inject 1 ounce of new crankcase oil
ambient temperature.
(MIL-L-6085) into cylinder head.
(2) Run for 2 hours at 3,600 rpm.
d. Blowby may increase by 0.02 scfm per 10F.
rise in ambient temperature when oil (MIL-L-6085) is
3-23. Pump-Up Time
used.
a.
Connect the compressor to a standard
30