Sealants, Lubricants, and Adhesives Authorized By CMI

CATEGORY 5
CONTINENTAL MOTORS® AIRCRAFT ENGINE
SERVICE INFORMATION LETTER
SIL99-2C
Contains Useful Information Pertaining To Your Aircraft Engine
TE CHN ICA L P O RTI O NS
S upe rs ede s SIL99-2B
FA A AP PROVE D
SUBJECT:
SEALANTS, LUBRICANTS, AND ADHESIVES
AUTHORIZED BY CMI
PURPOSE:
Provide current application of sealants, threading, lubricants, and adhesives.
COMPLIANCE: During engine installation, maintenance, overhaul or component repair or
replacement.
MODELS
AFFECTED:
All CMI engine models operating with AVGAS (gasoline based) fuel.
I. General Information
Lubricating oils qualified for use in Continental Motors, Inc. (CMI) gasoline engines are required to
meet Society of Automotive Engineers (SAE) specifications.
NOTE: Continental Motors, Inc. listing of accepted SAE J 1899
oils by manufacturer and brand name is provided only for the
convenience of our customers. Always refer to the manufacturer’s
label on the oil to ensure that the oil meets the appropriate SAE
specification.
Major sections within this document:
I.
II.
III.
IV.
V.
VI.
Page
General Information
Oil Change Intervals
Additives
Recommended Sealants, Lubricants, and Adhesives
Manufacturer/Distributor Supplemental Product Information
General Sealant Applications and Threading Procedures (typical)
1
3
3
4
10
11

SAE specification J 1899 (formerly MIL-L-22851) is the approval authority for aircraft piston
engine ashless-dispersant lubricating oil.
SAE specification J 1966 (formerly MIL-L-6082E) is the approval authority for aircraft piston
engine non-dispersant mineral oil.
QPL-J 1899: Qualified Products list is available from:
SAE Headquarters
400 Commonwealth Drive
Warrendale, PA 15096-0001
The Naval Air Systems Command is required to maintain QPL-J-1899 and QPL-J-1966.
Naval Air Systems Command 
47123 Buse Road
Building 2272, Suite 540
Patuxent River, MD 20670
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©2014 Continental Motors, Inc. All other product or company names that may be mentioned in this publication are trade names, trademarks, or registered
trademarks of their respective owners.
Recommended Oil Grade:
• Above 40°F ambient air, sea level SAE 50 or multi-viscosity
• Below 40°F ambient air, sea level SAE 30 or multi-viscosity
NOTE: See SIL99-1 (latest version) for preservation information.
The marketers of the aviation lubricating oil listed below (Table 1) have supplied data to
Continental Motors, Inc. (CMI) indicating their products conform to all the requirements of CMI
Specification MHS-24, Lubricating Oil, Ashless Dispersant.
In listing the product names, CMI makes no claim of verification of marketer's statements or
claims. The listing is made alphabetically and is provided only for the convenience of the user.
Table 1. Qualified SAE J-1899 Ashless Dispersant Engine Oil
Supplier
Air BP Lubricants
Brand
Castrol Aviator AD Oil
Castrol Aviator A Oil
ChevronTexaco Aero Oil AD
ChevronTexaco Aero Oil AD SAE 20W-50
Delta Avoil Oil
Exxon Aviation Oil EE
Exxon Elite
Gulfpride Aviation AD
Mobil Aero Oil
Turbonycoil 3570
ChevronTexaco
Delta Petroleum Company
Exxon Company, USA
Gulf Oil Company
Mobil Oil Company
NYCO S.A.
Pennzoil Company
Phillips 66
Quaker State Oil & Refining Co.
Red Ram Limited (Canada)
Shell Aviation
Sinclair Oil Company
Total France
Pennzoil Aircraft Engine Oil
Phillips 66 Type A 100 AD, 120 AD
Phillips 66 X/C Aviation Oil SAE 20W-50, SAE 25W-60
Phillips 66 Victory Aviation Oil 100AW
Quaker State AD Aviation Oil
Red Ram X/C Aviation Oil 20W-50
Aeroshell Oil, (Mineral) 65, 80, 100, 2F Anti Corrosion Formula
Aeroshell Multi-grade Oil AD, 15W - 50
Aeroshell Oil W65, W80, W100
Aeroshell Oil W80 Plus, W100 Plus Anti Corrosion Formula
Sinclair Avoil
Total Aero DM 15W - 50
Table 2. Break-in Oil
Type
MIL-C-6529 Type II Corrosion
preventive mineral oil1
Equivalent
SAE J-1966 Aviation Oil
Non-dispersant mineral oil for
piston aircraft engines
Fly-away oil
Application
First 25 hours of engine operation
or until oil consumption stabilizes
1. Mineral oil conforming to MIL-C-6529 Type II contains a corrosion preventive additive and must not be used for
more than 25 hours or six months, whichever occurs first. If oil consumption has not stabilized within this time, drain
the mineral oil, replace the oil filter, and replace discarded mineral oil with SAE J-1966 aviation oil.
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Table 3. Preservative Oil
Type
Equivalent
Grade 1 Oil, Non-Rust VCI-105
Motorstor Oil Preservative
MIL-P46002
Application
Temporary or Indefinite Storage
II. Oil Change Intervals
Refer to the engine maintenance manual and/or the aircraft manufacturers or Supplemental Type
Certificate (STC) holders AFM/POH for fuel specifications, specified oil change intervals and
inspection procedures.
Oil change intervals published in this manual are minimum requirements. Continental Motors,
Inc. (CMI) believes more frequent oil and filter changes enhance engine service life. CMI
recommends engine oil be drained and replenished every 25 hours of operation or 4 months for
engines that incorporate an oil screen. Engines with full flow oil filters, either large or small,
should have the oil changed every 50 hours or 4 months.
NOTE: When using the small oil filter (4.80 inch high) do not
exceed 50 hours and/or 6 months between oil and filter changes.
When using the larger oil filter (5.80 inch high) do not exceed 100
hours and/or 6 months between oil and filter changes. Oil screens
and oil filter elements must be inspected for contaminates at each
oil change. Oil analysis may be used in addition to the oil screen or
filter element inspection, but not as a replacement for it.
III. Additives
We often receive inquiries regarding the potential use of alternative fuel and oil additives and/or
concentrates (formulated primarily for automotive and industrial engine applications) for use in
our aircraft engines. Most of these additives and concentrates are not compatible with air-cooled,
light aircraft engines in their operating environments. With the exception of the use of isopropyl
alcohol or diethylene glycol monomethyl ether (DiEGME) compound (described in the following
paragraph), we do not recommend the use of additives or concentrates in any of our aircraft
engines. The use of unapproved additives may void the engine warranty. Use only recommended
fuels and lubricants.
WARNING
Mixing of DiEGME compound with fuel concentration in
excess of the recommended (0.15% volume maximum) could
have a harmful effect on engine components. Use only the
manufacturer’s recommended blending equipment and
procedures to achieve proper proportioning.
Under certain ambient conditions of temperature and humidity, sufficient quantities of water may
exist in the fuel to create restrictive ice formation in the fuel supply. To alleviate this occurrence,
it is permitted to add no more than 3% (by volume) isopropyl alcohol to the fuel supply. Also,
DiEGME conforming to military specification MIL-DTL-85470B, if approved by the aircraft
manufacturer, may be added for this purpose. DiEGME compound must be carefully mixed with
the fuel in concentrations not to exceed 0.15% (by volume).
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IV. Recommended Sealants, Lubricants, and Adhesives
Table 4. Sealants
Item
P/N
Type
1
642188
CRC Copper Coat 401504
Gasket Sealant
2
646940
F/I Sealant
Loctite 569 Hydraulic Sealant
3
646942
Gasket Maker
Loctite 515 Gasket Eliminator
Flange Sealant
4
649246
Loctite 290 Sealant
5
653692
Loctite LocQuic Primer 7649
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Application
Non-beaded gaskets; Apply both
sides of starter gasket, oil cooler
adapter gasket, vacuum pump
adapter gasket, and fuel pump pad
cover gasket.
Beaded gasket; Apply to nonbeaded side of starter gasket, oil
cooler adapter gasket, vacuum
pump adapter gasket, and fuel
pump pad cover gasket.
All press type plugs (Hubbard etc.)
Intake manifold gasket
ACC case to crankcase
(crankcase side only)
Oil drain back tubes
Oil cooler (both sides)
Oil seal accessory drive (O.D. only)
2 bolt suction tube gasket 
(both sides)
Remarks
0200D, X
All models
C-90, O200, IO240, O300,
IO360, LTSIO360, TSIO360
C-90, O200, O300
IO360, LTSIO360, TSIO360
IO360, LTSIO360, TSIO360
470, 520 and 550 (where
applicable)
470, 520, 550 (Sandcast), and
Gasket and oil filler neck holes
GTSIO520
Cam bore cover gasket 
470, 520, 550, GTSIO520,
(except beaded gasket)
IO240
Idler pin gasket
470, 520, 550, GTSIO520
Sump to crankcase or sump to
In parting line area of 3-way joints crankcase to accessory case
All gaskets (both sides) except
magneto gasket and gaskets
between intake manifold and
Tiara 6-285, 6-230
cylinder head.
Oil seal at alternator drive 
(O.D. only)
All pipe thread fittings in fuel
injection system (except pipe plug See Figure 2
threads in throttle body units)
Crankcase parting face
Where applicable
Engine nose seal, scavenge oil
pump covers, between crankcase All models, where applicable
and sump gasket, oil pump covers
Between starter adapter gasket &
All Permold crankcase models
crankcase
Between oil sump and sump gasket Non-beaded gaskets only
642910 oil seal, O.D. of all
uncoated oil seals, except fuel
All models, where applicable
pump adapter seal
Data plate screw installation on
All models, where applicable
throttle bodies
Crankshaft nose oil seal area
All models
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Table 4. Sealants
Item
P/N
6
654663
7
657042
8
N/A
9
N/A
Type
Application
Crankcase parting face
Starter adapter to accessory case
Loctite 1522029 Gasket
Sealant
Accessory drive adapter
(with P/N 641543 Silk Thread) Pressure oil pump covers
Pressure scavenge pump covers
Loctite 565 Adhesive Sealant Use on all pipe threads to oil
coolers and other oil sources
Ignition harness terminals at
Miller-Stephenson MS-122AD magneto block end & spark plug /
ECU terminals
Use on all pipe threads except as
noted elsewhere
All pressure relief valve housing
Loctite 592 Teflon PS/T Pipe threads
Permold 2 studs engine mount 1-3Sealant
5 side bottom
All threaded fasteners installed in a
stud hole through to an oil source
Remarks
Apply according to assembly
instructions
All models (use sparingly on
male threads only)
All models
All models, where applicable
Apply before installing threaded
fastener
Table 5. Lubricants
Item
1
P/N
646943
2
654468
3
654514
4
654561
Type
Loctite 76732 Anti-Seize
Lubricant
Application
Fuel injector nozzles 
(at cylinder head)
Mechanical tachometer drive
housing threads not connected
through to an oil source.
Exhaust studs (applied to nut end
before torque), exhaust slip joints
Vernatherm plug
All 0.3125 and larger studs unless
otherwise noted
Throttle body air reference fittings
Oil sump return fitting
Fuel injection linkages
Remarks
See Figure 2
At engine assembly
Where applicable
IO360ES3B & IO360HB9B
At engine assembly
Shell #5 MIL-G-3545-C Grease
Apply
at pivot points during
(optional Lubriplate 630 AA or
Throttle
&
mixture
control
linkages
assembly
and periodic
LPS 2)
maintenance
CRC 336 Rust Preventative
Spray exhaust end of turbocharger After engine test
Compound
Light coat at contact point between All models, where applicable
nut seat and ignition lead ferrule
Shell Alvania # 2
LTSIO360E, EB, RB;
Apply to oil seal lip only (alternator
TSIO360E, EB, F, FB, GB, KB,
seal)
LB
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Table 5. Lubricants
Item
5
P/N
656817
Type
Super Molyshield Grease
Application
Starter worm gear & bevel gear
teeth
Needle bearings and ball bearings
Valve stems
Accessory drive splines and
couplings
Idler gear and pin
Magneto rubber drive bushings
Oil seal lips only
Remarks
All models during engine
assembly
Where applicable
470, 520, 550
All models
Except 360, TSIO520D, 
GTSIO520K, which use 50W
motor oil
Coat gear cavity during pump
Oil pumps (pressure & scavenge) assembly
Adapter (tach reduction)
TSIO & LTSIO360
Fuel injection controls, o-rings,
springs, shafts, and bushings
Use only manufacturer’s
recommended spark plug
thread lubricant
Chesterton #995 Release
Agent
or WD-40
6
N/A
7
N/A
8
N/A
Dow Corning No. 4
9
N/A
Dow Corning G-N Paste
10
N/A
Lubriplate 930 AA
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Spark plugs
All models
Induction system hoses and flex
duct connections, pipe plugs in
All models
throttle body units
Rubber oil seal of spin-on oil filters
Governor pad gaskets (both sides) All models where applicable
Starter adapter cover o-rings
Camshaft lobes and tappet faces During engine assembly
All models during valve guide
O.D. of valve guides
installation
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Table 5. Lubricants
Item
11
P/N
N/A
Type
SAE J-1966 Grade 50 
MHS-27 Aviation Oil
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Application
Quill Shaft Springs
Crankshaft bearings
Connecting rod bearings
Prop driver, driven gears &
bearings
Camshaft bearings
Tachometer gears & adapters
Accessory spur gear teeth
Prop governor transfer collar &
sleeve
Starter cone, bushing & nut
Starter clutch spring (ID & OD)
Pistons, piston pins, & piston rings
Thrust washers
Oil filter adapter seals
O-rings
Carburetor fuel connections
Valve guide seals
V.T.C. unit pistons & centrifugal
valves, rocker arms, valves and
tappets
Cylinder studs, through bolts,
crankcase studs, connecting rod
bolts and nuts; and engine
accessory studs unless installed in
blind or stud holes not through to
an oil supply or otherwise specified
Remarks
GTSIO520
During engine assembly
Carburetor-equipped models
Apply to sealing surface
Tiara 6-285, 6-230
Lubricate bolt thread and nut
seat before tightening nuts
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Table 6. Adhesives
Item
1
2
3
4
5
6
7
P/N
Type
Remarks
Breakaway torque minimum
Cylinder deck studs
100 in-lbs. after two hours
470 & 520 (Sandcast) &
Crankcase breather tubes
GTSIO520
Crankcase nose seal retainer bolts All models
Intake manifold mount studs
C-75, C-85, C-90 & O-200
Mechanical tachometer drive studs
where applicable
trough to an oil source
IO360, LTSIO360, TSIO360,
O470, IO470, TSIO470,
Oil
gauge
rod
housing
to
crankcase
IO520A, B, E, G, J, K, L,
Loctite 271 High Strength
IO550D, E, F, TSIO520A, AE,
Adhesive Sealant
646941 (used with P/N 653693
AF, C, CE, G, H, M, P, R, T
Loctite 7471 Primer)
Oil pump gear mounting pin in
IO360, LTSIO360, TSIO360
accessory cover
IO240, IO360, LTSIO360,
Press fit breather and oil fill necks
TSIO360
Rocker cover studs, rocker arm
pivot studs, push rod retainer stud Tiara 6-285, 6-230
Timing indicator pin
GTSIO-520
Top accessory drive gear (breather
slinger) bolts
Tiara 6-285, 6-230
V.T.C. unit bushing retainer screws
V.T.C. unit housing to crankshaft
Diverter valve assembly 
TSIO360MB, SB
(bracket to valve)
IO360ES2B
Manifold valve to bracket screws All models
Coolant pump impeller ring screws All liquid cooled models
Studs 0.25 diameter and smaller All models
Manifold valve assembly data plate
649306 Loctite 222 Sealant
All models
(optional (or optional Loctite Hydraulic screws
646940) Sealant 569)
0200, IO240, 0300, IO360,
Mag stud holes and stud holes
LTSIO360, TSIO360, 470, 520,
through an oil source on accessory
550 (apply when installing
end of crankcase
studs)
All pipe thread fittings in fuel
injection system except pipe plug All models
threads in throttle body unit
Magneto housing pressurization
649366 Loctite 242
All models, where applicable
fitting
Coolant pump mechanical seal,
652983 Loctite 620 Adhesive Sealant standard repair on starter adapter All liquid cooled models
bearing bore
654495 Loctite 8531 Adhesive Sealant Starter clutch assembly bearing
O200, O300, IO240
Bearing OD installed on starter
654562 Loctite 609 Adhesive / Sealant
O200A, B, IO240A, B, O300A
clutch assembly
GIO550, GTSIO520, IO520,
655515 Adhesive Sealant (RTV)
Alternator assembly
IO550, IOF550, TSIOL550,
TSIOF550
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Application
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Table 6. Adhesives
Item
P/N
Type
Application
8
655700
PBC30 Adhesive
9
800126
3M Super 77 Adhesive
10
658493
3M Scotch-Weld 1300
Adhesive
Remarks
IO360, TSIO360, LTSI360,
Inter-cylinder baffles
TSIO520, IO550, IOF550,
TSIO550 and TSIOF550
All FADEC (apply to gasket
EMI Gasket
before installing on ECU
IO360AF, ES; TSIO360MB, RB;
LTSIO360RB; TSIO520BE;
Induction manifolds, diverter valve IO550G, N, P, R; IOF550 ;
bracket
TSIO550A, B, C, E, G, K, N;
TSIOF550
Table 7. Miscellaneous
Item
1
2
3
4
5
P/N
Type
Safety wire -.032 in dia. Steel
535011
Corrosion Resistant
Safety wire -.020 in dia. Steel
800154 Corrosion Resistant
626531-1 Enamel - Gold (1 qt)
626531-2 Enamel - Gold (1 gal)
“ACCELAGOLD”
N/A
Turco Products
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Application
Remarks
Where safety wire is required
N/A
Where safety wire is required
FADEC electronic control units
High temperature paint for
cosmetic and corrosion protection
N/A
Corrosion protection interior and
exterior aluminum parts
N/A
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V. Manufacturer/Distributor Supplemental Product Information
Table 8. Supplemental Product Information
Manufacturer/Distributor
Recommended Products
American Lubricants / Moly
Motor Oil
Super Molyshield
A.W Chesterton Company
Chesterton #995 Release Agent
CRC Industries/Chemical
Products
336 Rust Preventative Compound
Copper Coat 401504 Gasket
Sealant
Daubert Chemical
MIL-P-46002A Grade 1 Oil
Non-Rust VCI-105
Dow Corning Corporation
Dow Corning No. 4
Dow Corning G-N Paste
Graham Aircraft Engines
Motorstor Oil
Henkel Aerospace
ACCELAGOLD Turco Products
Loctite Industrial Products
Loctite 76732
Loctite 565 Adhesive Sealant
Loctite 569 Hydraulic Sealant
Loctite 515 Gasket Eliminator
Loctite 290
LocQuic Primer 7649
Loctite 1522029 Gasket Sealant
Loctite 592 Teflon PS/T Pipe
Sealant
Loctite 222 Sealant
Loctite 271 HS
Loctite 242
Lubriplate
Lubriplate 930 AA
Miller-Stephenson Chemical Co.
MS-122AD (10400533)
Shell Oil Company
Shell #5
Shell Alvania #2
1
Address
1227 Deeds
Dayton, OH 45401
500 Unicorn Park Drive
Woburn, MA 018013345
885 Louis Drive
Warminister, PA 18974
Web Address
Phone
FAX
(http://www.)
937-222-2851 618-534-5231 molymotoroil.com
800-835-4135 781-438-8971 chesterton.com
781-438-7000
800-272-4620 800-272-4560 crcindustries.com
800-556-5074 215-674-2196
4700 South Central Ave 708-563-8325 708-496-7367 daubertchemical.com
Chicago, IL 60638
P.O. Box 994
South Saginaw Road
Midland, MI 48686
PO Box 3214
Peachtree City, GA
30269
32100 Stephenson Hwy
Madison Heights, MI
48071
1001 Trout Brook
Crossing
Rocky Hill, CT 060673910
129 Lockwood St.
Newark, NJ 07105
6348 Oakton St
Morton Grove, IL 60053
P.O. Box 2463
Houston, TX 77252
989-496-4400 989-496-7879 dowcorning.com
800-662-0661
770-252-4995 770-252-5270 highaero.com
248-583-9300 248-583-2976 henkel.com
860-571-5100 860-571-5465 loctite.com
800-243-4874
973-589-9150 973-589-4432 lubriplate.com
800-733-4755
847-966-2022 847-966-8468 miller800-992-2424
stephenson.com
713-241-4819 713-241-6511 shell-lubricants.com
800-332-6457
1. Unless otherwise indicated, type http://www. followed by the Web Address. shown
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VI. General Sealant Applications and Threading Procedures (typical)
CAUTION: Never use Teflon tape on fluid fittings or fuel nozzles.
Only apply sealants or lubricants to fitting tapered ends up to the first
two threads. Never apply to the first two threads to prevent
contaminating fuel supply.
Figure 1. General Anti-Seize Lubricant Application
Figure 2. General Fuel Injection Sealant Application
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A. Crankcase Sealant and Threading Procedure for Four Cylinder Engines
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before
using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply P/N 654663 (gasket sealant) to 2-4 case half. Apply g a s k e t s e a l a n t p e r t h e
m a n u f a c t u r e r ’ s i n s t r u c t i o n s o n l y in areas where threading is indicated. When
applying, use short light brush strokes until an even thin coat is obtained. The gasket
sealant should be viscous enough that most of the brush marks disappear; if not, remove
old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading. Do not apply gasket sealant to crankshaft
nose seal area.
3. Apply a thin translucent coat of P/N 654942 (gasket maker), not to exceed 0.010 inch
thick, to t h e 1 -3 case half. Apply gasket maker in all areas that will mate against
areas where gasket sealant was applied on the matching 2-4 case half (except the through
bolt bosses).
4. Apply and position P/N 641543 (a continuous, single piece of grade “D” silk thread) on the
2-4 case half as specified (see Figures 3 and 4, page 13). Ensure the free ends of your
thread are covered by gaskets (except at the nose oil seal).
5. Clean crankcase crankshaft front oil seal land with P/N 653692 (LocQuic Primer “N”)
and apply an even coat of P/N 654942 (gasket maker).
6. Assemble crankcase halves; install and torque all crankcase hardware in proper sequence in
accordance with the applicable overhaul manual as soon as possible.
NOTE: Take care to prevent displacement or damage to the
crankshaft oil seal and silk thread. Insure thrust washer halves and
bearing halves remain in place.
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Figure 3. Threading Diagram, C75, C85, C90, O200 Crankcase
Figure 4. Threading Diagram, 240, IO240 Crankcase
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B. Crankcase Sealant and Threading Procedure for Six Cylinder Engines
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before
using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply P/N 654663 (gasket sealant) to 2-4-6 case half. Apply g a s k e t s e a l a n t p e r
t h e m a n u f a c t u r e r ’ s i n s t r u c t i o n s only in areas where threading is indicated.
When applying, use short light brush strokes until an even thin coat is obtained. The
gasket sealant should be viscous enough that most of the brush marks disappear; if not,
remove old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading. Do not apply gasket sealant to crankshaft
nose seal area.
3. Apply a thin translucent coat of P/N 654942 (gasket maker), not to exceed 0.010 inch
thick, to t h e 1 -3-5 case half. Apply gasket maker in all areas that will mate against
areas where gasket sealant was applied on the matching 2-4-6 case half (except the through
bolt bosses).
4. Apply and position P/N 641543 (a continuous, single piece of grade “D” silk thread) on the
2-4-6 case half as specified (see Figures 5 through 8, pages 15-16). Ensure the free ends
of your thread are covered by gaskets (except at the nose oil seal).
5. Clean crankcase crankshaft front oil seal land with P/N 653692 (LocQuic Primer “N”)
and apply an even coat of P/N 654942 (gasket maker).
6. Assemble crankcase halves; install and torque all crankcase hardware in proper sequence in
accordance with the applicable overhaul manual as soon as possible.
NOTE: Take care to prevent displacement or damage to the
crankshaft oil seal and silk thread. Insure thrust washer halves and
bearing halves remain in place.
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Figure 5. Threading Diagram, IO360, LTSIO360 Crankcase
Figure 6. Threading Diagram, IO520, TSIO520, IO550, IOF550, TSIO550, TSIOL550 Permold Crankcase
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Figure 7. Threading Diagram, O470, IO470, LIO520, LTSIO520, IO550 Sandcast Crankcase
Figure 8. Threading Diagram, GTSIO520 Crankcase
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C. Sealant and Threading Procedure for Scavenger Pump Bodies
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before
using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply gasket sealant p e r t h e m a n u f a c t u r e r ’ s i n s t r u c t i o n s only in areas
where threading is indicated. When applying, use short light brush strokes until an even
thin coat is obtained. The gasket sealant should be viscous enough that most of the brush
marks disappear; if not, remove old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading.
3. Apply a thin translucent coat of P/N 654942 (gasket maker), not to exceed 0.010 inch
thick in all areas that will mate against areas where gasket sealant was applied on the
matching surfaces.
4. Apply P/N 641543 (a continuous, single piece of grade “D” silk thread) as shown by the
dashed lines in Figure 9.
5. Assemble and torque as soon as possible in accordance with the applicable overhaul
manual.
Figure 9. Threading Diagram, Scavenge Pump Bodies 640741, 652019, 652019, & 655713
(used on starter adapters 642087 & corresponding 0.015 oversize adapters)
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D. Sealant and Threading Procedure for Oil Pump Assemblies
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply gasket sealant p e r t h e m a n u f a c t u r e r ’ s i n s t r u c t i o n s only in areas
where threading is indicated. When applying, use short light brush strokes until an even
thin coat is obtained. The gasket sealant should be viscous enough that most of the brush
marks disappear; if not, remove old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading.
3. Apply a thin translucent coat of P/N 654942 (gasket maker), not to exceed 0.010 inch
thick in all areas that will mate against areas where gasket sealant was applied on the
matching surfaces.
4. Apply P/N 641543 (a continuous, single piece of grade “D” silk thread) as shown by the
dashed lines in Figures 10 through 14, pages 18-20).
5. Assemble and torque as soon as possible in accordance with the applicable overhaul manual.
Figure 10. Threading Diagram, Oil Pump Assembly 632623
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Figure 11. Threading Diagram, Oil Pump Assembly 631713, 632481, 632563, & 641993
Figure 12. Threading Diagram, Oil Pump Assemblies 646194, 653536, 655121, & 643527
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Figure 13. Threading Diagram, Oil Pump Assemblies 643716, 643717, 643743, 643778, 643779,
653494, 653538, 653542, 653542, 653553, 655117, 655119, 655123, 655124, & 655127
Figure 14. Threading Diagram, Oil Pump Assemblies 631149, 632970, 632977, 654437, 655349, &
655680
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E. Sealant and Threading Procedure for Starter Adapter Assemblies
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before
using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply gasket sealant p e r t h e m a n u f a c t u r e r ’ s i n s t r u c t i o n s only in areas
where threading is indicated. When applying, use short light brush strokes until an even
thin coat is obtained. The gasket sealant should be viscous enough that most of the brush
marks disappear; if not, remove old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading.
3. Apply a thin translucent coat of P/N 654942 (gasket maker), not to exceed 0.010 inch
thick in all areas that will mate against areas where gasket sealant was applied on the
matching surfaces.
4. Apply P/N 641543 (a continuous, single piece of grade “D” silk thread) as shown by the
dashed lines in Figure 15.
5. Assemble and torque as soon as possible in accordance with the applicable overhaul
manual.
Figure 15. Threading Diagram, Starter Adapter Assemblies 641348, 646220, & 653074
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F. Sealant and Threading Procedure for Accessory Starter Drive Adapter Assemblies
1. Use full strength, non-thinned P/N 654663 (gasket sealant). Shake or mix well before
using.
CAUTION: Apply gasket sealant and threading (a continuous, single
piece) only as illustrated.
2. Apply gasket sealant p e r t h e m a n u f a c t u r e r ’ s i n s t r u c t i o n s only in areas
where threading is indicated. When applying, use short light brush strokes until an even
thin coat is obtained. The gasket sealant should be viscous enough that most of the brush
marks disappear; if not, remove old gasket sealant and reapply with new gasket sealant.
NOTE: Allow the gasket sealant to air dry to a tacky condition before
applying silk threading.
3. Apply P/N 641543 (a continuous, single piece of grade “D” silk thread) as shown by the
dashed lines in Figure 16.
4. Temporarily install the starter adapter to make an impression of the thread on the
accessory case.
5. Carefully remove the starter adapter so that the shaft gear does not pull out.
6. Inspect the thread impression for 100% contact between the adapter and accessory
case.
7. Wipe excess gasket maker off of accessory case and install starter adapter in accordance
with the applicable overhaul instructions.
Figure 16. Threading Diagram, Accessory Starter Drive Adapter Assemblies 641348 & 653074
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