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TM 55-1905-219-14-10
10. Check the air inlet restriction with a water
manometer connected to a fitting in the air
inlet ducting located 2 inches above the air
inlet housing. When practicability prevents
the insertion of a fitting at this point, the
manometer may be connected to a fitting in-
stalled in the 1/4 inch pipe tapped hole in
the engine air inlet housing. If a hole is
not provided, a stock housing should be
drilled, tapped, and kept on hand for future
use .
11. The restriction at this point should be check-
ed at a specific engine speed. Then the air
cleaner and ducting should be removed from the
air inlet housing and the engine again oper-
ated at the same speed while noting the mano-
meter reading. The difference between the two
readings, with and without the air cleaner and
ducting, is the actual restriction caused by
the air cleaner and ducting.
12. Check the normal air intake vacuum at various
speeds (at no-load),and compare the results
with the Engine Operating Conditions in
Chapter 3. Record these readings on the
Engine Test Report.
13. Check the exhaust back pressure at the exhaust
manifold companion flange or within one inch
of this location. This check should be made
with a mercury manometer through a tube adap-
tor installed at the tapped hole. If the ex-
haust manifold does not provide a 1/8 inch
pipe tapped hole, such a hole can be incorpor-
ated by reworking the exhaust manifold.
Install a fitting for a pressure gage or mano-
meter in this hole. Care should be exercised
so that the fitting does not protrude into the
stack. The manometer check should produce a
reading in inches that is below the Maximum
Exhaust Back Pressure for the engine.


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