MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Date
MAR 2017
Rev Date
Page
6
81-20-00 - TURBOCHARGER TROUBLESHOOTING
TROUBLE PROBABLE CAUSE CORRECTION
Engine lacks power, reduction in
maximum manifold pressure or
critical altitude
Improperly adjusted controller Refer to CMI Maintenance and
Overhaul Manual M- 18 section re-
garding Post Maintenance Adjust-
ment and Test to adjust controller.
Loose or damaged exhaust system Inspect entire exhaust system to
turbocharger for cracks and leak-
ing connections. Torque connec-
tions and replace damaged parts.
Malfunctioning turbocharger Check for unusual noise in turbo-
charger. If malfunction is sus-
pected, remove exhaust and/or air
inlet connections and check rotor
assembly for possible rubbing in
housing, damaged rotor or dam-
aged bearings. Per component
manufacturer’s instructions, re-
place if turbocharger damage is
noted.
Exhaust system gas leakage inspect exhaust system for gas
leakage, gaskets at cylinder ex-
haust ports, gaskets at turbine inlet
flanges, et., and correct.
White smoke exhaust Turbo coking, oil forced through
turbine housing seal
Clean and change turbocharger.
Low manifold pressure Improperly adjusted controller Adjust according to CMI Mainte-
nance and Overhaul Manual M- 18
section regarding Post Mainte-
nance Adjustment and Test or re-
place if adjustment cannot be
made.
Binding wastegate Replace.
Induction or exhaust manifold
leaks
Repair or replace as required.
Manifold pressure higher than nor-
mal
Binding wastegate Replace wastegate.
Improperly adjusted controller Adjust per CMI Maintenance and
Overhaul Manual M- 18 section re-
garding Post Maintenance Adjust-
ment and Test.
Loss of aircraft’s critical altitude Improperly adjusted controller Adjust per CMI Maintenance and
Overhaul Manual M- 18 section re-
garding Post Maintenance Adjust-
ment and Test.
Induction or exhaust manifold
leaks
Repair or replace as required.
Aftercooler plugged or damaged Repair or replace as required.
Turbocharger oil seals leaking Worn or damaged seals Refer to CMI Maintenance and
Overhaul Manual M- 18.
81-20-00
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