TM 9-2815-202-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR INTAKE SYSTEM
(TURBOCHARGER REGULATOR - ENGINE)
(MODELS 7083-7398 AND 7083-7399 ONLY)
13.
BYPASS VALVE FAILS TO CLOSE
Step 1. Remove turbocharger regulator and check for carbon build-up on bypass valve.
Remove carbon as required.
Step 2. Check for broken bypass valve spring.
Replace turbocharger regulator if spring is broken (Refer to Para 6-2).
END OF TEST
14.
EXCESSIVE EXHAUST PRESSURE AT TURBOCHARGER
Step 1. Remove turbocharger regulator and check for carbon build upon bypass valve.
Remove carbon as required.
Step 2. Check for damaged air pressure lines.
Replace air pressure lines.
Step 3. Check turbocharger regulator calibration.
a. Remove air inlet line to turbocharger regulator.
NOTE
If regulator valve moves with 13.0 PSI (90.0 kPa) air pressure at
inlet, regulator is within limits.
b. Hookup air supply to regulator inlet port. Slowly apply air pressure and
record when valve movement occurs.
c. If regulator is out of limits, replace unit.
d. Install air inlet line to regulator.
END OF TEST
2-17
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