MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
6
MAR 2017
Rev Date
28-00-01 - FUEL FILLER CAP ASSEMBLY MAIN-
TENANCE
Fuel filler port cap assemblies should be inspected pe-
riodically for proper sealing, condition of O- rings and
should be serviced occasionally to prevent hard to
open or close conditions.
Aero 300 Fuel Fill Caps: 2.25”
610213- 001 (Bat Inc)
610213- 003 (Newton)
610213- 005 Locking Type (Bat Inc)
610213- 007 Locking Type (Newton)
Replace O- Rings at 5 years or unusual wear part num-
ber #225 suffix #NBR70 (was FPM 75) Mooney Service
Parts now offers a O- Ring Kit # OHK3.
1. The O- ring seal (1) (Figure 28- 2) around the cap
assembly should be kept clean and free of dirt or grit
that might cause abrasive action on seal or mating
flange. Occasional lubrication with petroleum jelly or
Tri- Flow (Teflon Lubricant) will keep O- ring soft and
pliable.
-NOTE-
Fuel selector should be in the OFF position be-
fore proceeding with paragraph (A) to pressurize
the fuel tanks.
- CAUTION -
-CAUTION-
Use only one- half pound (0.5 psi) of air
pressure in tank.
A. Connect rubber hose to each tank’s vent line.
Apply ONLY one- half pound (1/2 psi) air pressure.
Check for fuel cap leaks by soaping circumference and
shaft area of filler cap assembly and observing
bubbles. Replace O- ring if bubbles are observed.
1
FUEL FILLER CAP ASSEMBLY
FIGURE 28- 2
28-10-00 - STORAGE
28-11-00 - FUEL TANK FIELD REPAIR
This paragraph outlines procedures recommended for
repair of integral fuel tanks. Tank repairs should not be
attempted until these instructions are fully understood.
Refer to Service Bulletin SB M20- 230 for a general
concept on resealing tanks.
1. Approved Materials.
A. Sealants.
-WARNING-
Sealants are safe only when handled with reason-
able care. Avoid ingestion and all contact with the
body, especially with open breaks in the skin.
Wash hands before eating or smoking. If accelera-
tor contacts the skin, flush area with warm water.
(1) Brush sealant - PR1422- A- 1/2 or A- 2 or
CS3204 A- 1/2, A- 2 (MIL- S- 8802D Class A).
(2) Filleting Compound - PR1422 B- 1/2, B- 2 or
CS3204 B- 1/2, B- 2 (MIL- S- 8802D Class B).
(3) Removable access panel sealant -
PR1428- B.
(4) Protective sealant - PR1005- L
MIL- S- 4383B).
B. Gloves - Polyethylene
C. Metal cleaning solvent - Turco 657 wipe sol-
vent, Methyl Ethyl Ketone or other approved solvent.
D. Cheese cloth.
E. Turco leak detector or bubble fluid.
F. Methyl ethyl keytone (MEK) (thinner for PR
1005- L). Check with local authorities for restrictions on
usage of MEK.
-NOTE-
Approved materials may be obtained from your
local Mooney Service Center. Sealants may also
be obtained from Products Research Co., 5454
San Fernando Road, Glendale, CA. 91209; or
Chem Seal Corp., 11120 Sherman Way, Sun
Valley, CA. 91352
2. Handling and Mixing Sealants.
A. Sealant Material Characteristics.
(1) Application life is the time that the mixed com-
pound remains suitable for application. Application life
ratings are always based on standard atmospheric
conditions of 75
F. and 50% relative humidity. For ev-
ery 10
F. rise in temperature, application life and cure
time is reduced by half; for every 10
F. drop in tempera-
ture, application life and cure time is doubled. High hu-
midity at the time of mixing slightly reduces the sealant
application life.
(2) Maximum unopened container life, with seal-
ant at 80
F., is six months.
28-00-01
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