MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
6
MAR 2017
Rev Date
-NOTE-
When defueling using removable tank quick
drains, it is only necessary to remove the drains
and to operate the gascolator drain.
12-10-03 - ENGINE OIL
Check engine oil level after engine has been stopped
long enough for oil to drain back into sump. The oil filler
cap access door is located in the top cowling. Any lubri-
cating oils approved by Teledyne Continental Motors
(MHS24) are acceptable for use after break- in period.
Approved products and engine oil viscosity require-
ments are shown in Chapter 5-20-07.
-CAUTION-
The terms “detergent”, “additive”, and “com-
pounded” used in this manual are intended to
refer to a class of aviation engine lubricating
oils to which certain substances have been
added to improve them for aircraft use. These
terms do not refer to such materials common-
ly known as “top cylinder lubricant”, “dopes”
and “carbon remover” which are sometimes
added to fuel or oil. These products may
damage the engine and therefore, should not
be used. Under no circumstances should au-
tomotive oil be used, since such oils could
cause engine damage.
During the engine break- in period, Nondispersant min-
eral oil conforming to SAE 51 966 shall be used. How-
ever, if the engine is flown less than once a week, a
straight mineral oil with corrosion preventative
MIL-C-6529 for the first 25 hours is recommended.
After the first 25 hours of the airplane’s time in service,
the oil and oil filter must be changed and a new supply
of Continental Motors specification MHS-24 (latest re-
vision) ashless dispersant oil must be used. At 50 hours
of time in service, the oil and oil filter shall be changed.
Discard the old filter and replace with new. Check dis-
carded oil for evidence of metal particles. Thereafter,
the oil and oil filter must be changed at every 50 hours
of time in service. Use CMI filter or approved equivalent
(Champion #48109).
At the first oil change, the engine and related accesso-
ries including the magnetos, starter, alternator, engine
driven fuel and oil pumps, oil cooler, and propeller gov-
ernor, should be inspected for oil leaks and security.
When changing from mineral oil to additive oil, filter
should be changed regardless of the operation time.
Check screens and filters for sludge or plugging every
10 hours after switching from mineral oil to ashless dis-
persant (additive) oil or until no sludge or plugging is
found.
12-10-04 - OXYGEN SYSTEM
PRECISE FLIGHT SYSTEM (OPTIONAL)
The oxygen cylinder, when fully charged, contain
approximately 77 cubic feet of aviators breathing oxy-
gen (Specifications No. MIL-O-27210). Recharging of
this oxygen c
ylinder should be accomplished by using
the appropriate Precise Flight recharging fittings to the
pressure shown in Chapter 35.
12-20-00 - SCHEDULED SERVICING
12-20-01 - INDUCTION AIR FILTER
The importance of keeping the induction air filter (fig.
12- 1) clean cannot be over- emphasized. A clean filter
promotes fuel economy and longer engine life.
Challenger Aviation Products
Re- charging instructions must be followed carefully for
maximum air filter life. Air filter must be recharged ev-
ery 100 hours or 12 months or sooner if operated in ex-
treme dusty conditions. Air filter assembly must be re-
placed after 25 cleanings or sooner if any deterioration
or damage is found during pre- flight, post flight or any
other aircraft inspections.
To clean the Challenger Aviation Products filter:
1. Remove engine cowling.
2. Remove the air filter assembly from the aircraft air
box. DO NOT REMOVE filter element from inside its
frame. Remove the old sealing gasket from filter as-
sembly with frame.
3. Begin re- charging air filter by “gently” tapping the
filter assembly on a hard surface to remove any loose
dust that will easily fall off the filter. Visually inspect the
filter for any damage, cracks, broken wires or missing
fibers. If any of those conditions are visible, the filter as-
sembly must be scrapped and replaced with a new filter
assembly.
4. Begin cleaning with Challenger Re- charger Kit
P/N CP-99-5050. Inside are two squeeze bottles, one
for cleaning and one red in color for re- oiling the filter
element. Remove the bottle containing cleaning fluid
and thoroughly saturate the filter. Allow the filter to soak
for approximately 15 minutes. DO NOT USE ANY
OTHER CLEANING FLUID.
5. Flush the filter with low non- pressurized warm wa-
ter starting from inside out. After flush, gently shake the
water out of the filter and allow to air dry only. DO NOT
USE ANY OTHER DRYING METHOD.
6. Remove the bottle from the Re- charger Kit P/N
CP-99-5050 containing oil red in color. Begin re- oiling
the dry filter by applying a bead or line of red oil along
the top only of each pleat of the filter. The oil will soak
into the length of each pleat. It may be necessary to ap-
ply oil on filter material that has not received oil from the
wicking action. The entire filter medium must be cov-
ered with red oil. DO NOT OVER OIL. If oil drips from
the filter, it has been over oiled. Allow the filter to drain
the excess oil onto a clean rag or paper towel until the
12-10-04
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