Mooney M20TN, Service And Maintenance Manual

Page: 559 / 1169

MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 5
78--00--00 -- GENERAL
The exhaust system’s headers, turbochargers and ex-
haust pipes are manufactured by Teledyne Continental
Motors (TCM). They are designed to optimally scav-
enge the cylinders exhaust gases during normal engine
operation. Refer to TCM Service and Maintenance
Manual M18 for more detailed information on removal
and installation of the exhaust system.
Inspections for cracks, burns, etc. are required during
each maintenance activity and recommended before
each flight.
78--10--00 -- EXHAUST SYSTEM INSTALLATION
1. EXHAUST PIPE HEADERS TO ENGINE.
A. Place new exhaust gaskets in position on the LH
& RH engine exhaust flange studs.
B. Place either LH or RH header pipe into position
on engine cylinder exhaust flanges. Be careful during
this procedure to ensure that the exhaust gaskets re-
main in proper position on each cylinder exhaust
flange.
NOTE:
Attach new headers with existing exhaust flange
stud nuts. (If nuts have been damaged, replace
them with new nuts, (P/N 643967, available from
TCM).
Leave exhaust flange stud nuts loose so header is mov-
able.
C. Lubricate outside of inner and inside of all outer
slip joints on headers and the outside of header pipe
flanges with MIL--A--907 type Hi--temp anti--seize com-
pound, C5--A (Fel--Pro) or equivalent.
2. EXHAUST SYSTEM REMOVAL
Refer to Chapter 71--00--10 Engine Removal instruc-
tions for turbocharger/exhaust system connections.
R78--2
EGT INSTALLATION (TYP)
FIGURE 78--2
3. EGT PROBE INSTALLATION/SECURITY
Garmin G1000 equipped M20TN aircraft utilize six cyl-
inder EGTs and one system EGT to monitor exhaust
gas temperatures. Refer to Garmin G1000 service liter-
ature for recommended EGT probe maintenance and
troubleshooting.
78--30--00 -- EXHAUST SYSTEM SERVICING
1. CLEANING
To properly inspect exhaust system, components must
be clean and free of oil, grease, etc. Clean as follows:
A. Spray engine exhaust system components with
a suitable solvent (Stoddard Solvent), allow to drain
and wipe dry with clean cloth.
-- WARNING--
When using Stoddard Solvent, follow directions
and warnings given by the manufacturer.
-- WARNING --
Never use highly flammable solvents on engine
exhaust systems.
-- WARNING --
Never use a wire brush or abrasives to clean ex-
haust systems or mark on system with lead pen-
cils. A mark with pencil lead (zinc or galvanized
tool) can be absorbed by the metal of the exhaust
system when heated. This causes a change in its
molecular structure. This softens the metal in the
area of the mark, and can cause cracks and even-
tual failure.
2. VISUAL INSPECTION OF COMPLETE SYSTEM
A thorough inspection of engine exhaust system will
detect any breaks or cracks causing leaks which might
result in loss of efficiency, loss of engine power or en-
gine compartment fire. Inspect per following proce-
dures:
NOTE:
This inspection should be conducted when
engine is cool.
A. LOOK FOR LEAKS -- Examine surfaces adja-
cent to exhaust system components for signs of ex-
haust soot. Look for gray, red or black gas stains at
welds, clamps, flanges, etc. Inspect exhaust system for
chaffing by cowling, engine mount, cables or any air-
frame components.
Inspect exhaust stacks for burned areas, cracks and
looseness.
B. LOOSE CONNECTIONS -- Inspect exhaust
clamps for cracks, looseness and proper security.
NOTE:
During inspection, particular attention should be
given to condition and security of flanges, spot
welds, slip joints, and welded areas.
C. INTERNAL EROSION -- Examine bends and
low spots for thinning or pitting.
D. STANDOFFS (PINS) AND HEAT TRANSFER
FINS -- Look for missing or damaged heat transfer pins
or fins. Look for holes at these locations.
AUGUST 2010
78--00--00