MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
5
2006
Rev Date
74--00--00 -- GENERAL
The TSIO--550--G ( ) series engines are equipped with
pressurized magnetos with impulse couplings on each
magneto.
The magneto/starter switch combines both ignition and
starting functions. Turn key clockwise through R, L and
BOTH to START position; push forward on key while in
START and starter relay is energized. Release of key,
after engine starts, will return switch to BOTH position
where both magnetos are operative.
In OFF position, both magnetos are grounded. At R
position, left magneto is grounded and at L position,
right magneto is grounded.
74--10--00 -- ELECTRICAL POWER
74--10--01 -- IGNITION SYSTEM TROUBLESHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
Failure to start or hard starting.
Grounded switch wires.
Check for grounded wires.
Magneto impulse coupling not op-
erating properly.
Refer to TCM Maintenance and
Overhaul manual M--18.
Spark plugs fouled, improperly
gapped or loose.
Remove and clean spark plugs.
Adjust to proper gap. Install and
tighten to specified torque.
Magnetos improperly timed to en-
gine.
Check magneto timing to engine.
Refer to TCM Maintenance and
Overhaul manual M--18.
Shorted Condenser.
Replace Condenser.
Magneto internal timing incorrect
or timed for opposite rotation.
Install correctly timed magneto.
Reference TCM Maintenance and
Overhaul manual M--18, for timing
procedures.
Engine roughness (Idle).
Loose, fouled or improperly
gapped spark plugs.
Tighten Spark Plugs. Clean spark
plugs. Adjust spark plug gap
(.016/.021 both Champion fine wire
and thick electrode). Install new
spark plugs.
Weak Condenser.
Replace Condenser.
Engine Roughness (Above Idle
RPM).
Loose or improperly gapped spark
plugs.
Tighten to specified torque. Adjust
to proper gap (.016/.021 both
Champion fine wire and thick elec-
trode).
High tension leak in ignition har-
ness.
Check plug leads for deterioration.
Weak or burned out condenser as
evidenced by burned or pitted
breaker points.
Replace points and condenser.
Sluggish Operation and/or Exces-
sive RPM drop.
Fouled or dead spark plugs.
Clean spark plugs. Replace dead
spark plugs.
Improperly gapped spark plugs.
Adjust to proper gap.
Magnetos out of time with spark
plugs.
Refer to TCM Maintenance and
Overhaul manual M--18 for timing
procedure.
Damaged magneto breaker points
or condenser.
Replace points and condenser.
74--00--00
AUGUST 2010
Summary of Contents for M20TN
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Page 73: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 6 DIMENSIONS AND AREAS ...
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Page 111: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 10 PARKING AND MOORING ...
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Page 119: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 11 PLACARDS AND MARKINGS ...
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Page 151: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 21 ENVIRONMENTAL SYSTEMS ...
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Page 191: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 24 ELECTRICAL POWER ...
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