Quantcast BYPASS  VALVE  FAILS   TO   CLOSE

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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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