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TYPICAL
MULTI-CYLINDER
COMPRESSOR
FIGURE 8 - IRV
VALVE TEST APPARATUS
™
OPERATION & LEAKAGE TESTS
(Figures 7 & 8)
GENERAL
In order to test the operation of the IRV
necessary to install the equipment and apparatus as
illustrated in Figure 8.
The Bendix compressor inlet adapter in Figures 7 and 8 can
be obtained at the nearest Bendix parts outlet. In most cases
the inlet adapter will be required, however, if the IRV
being tested has a 1/8 inch NPT access port in the area of
its flange, the adapter is not needed.
In addition to the inlet adapter two test gauges of known
accuracy and a pressure regulating valve capable of
graduation in the 5-30 psi range will be required to complete
the tests.
LEAKAGE TESTS (FIGURE 8)
1. With the engine off and vehicle air system pressure above
15 psi, apply 15 psi shop air pressure at the turbo supply
port of the IRV
™
valve. When pressure stabilizes on test
gauge 'A', proceed to Step 2.
4
COMPRESSOR
INLET CAVITY
INLET GASKETS
(243430)
2. Using a soap solution check for leakage at the IRV
valve it will be
™
OPERATIONAL TESTS (FIGURE 8)
1. Drain the air pressure from the vehicle reservoirs.
2. Apply 25 psi shop air pressure to the turbo supply port
valve
™
3. Using the pressure regulating valve and test gauge B,
TEST
GAUGE A
ADAPTER
(236701)
IRV
valve vent in the body, around the two inch cap nut and
at the exhaust plug of the safety valve. Leakage in excess
of a one inch bubble in one second is unacceptable.
of the IRV
valve, start the engine and allow it to run at
™
an idle (approximately 600-700 RPM). When vehicle air
system pressure rises above 25 psi, proceed to Step 3.
adjust the shop air pressure being delivered to the IRV
valve in 5 psi increments between 5 and 25 psi. Pause
15-20 seconds at each pressure setting and note that
the compressor inlet pressure, as indicated by test gauge
'A', is 12 psi or less. If the pressure exceeds 12 psi
more than momentarily, the IRV
or replaced.
Note: The tests described in this step must be made
with the compressor loaded.
AIR LINE
QUICK
COUPLER
TEST
GAUGE B
PRESSURE
REGULATING
VALVE
TO SHOP AIR
™
valve should be repaired
™
™
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