Service Information Letter
CATEGORY 5
CONTINENTAL MOTORS® AIRCRAFT ENGINE
SERVICE INFORMATION LETTER
Contains Useful Information Pertaining To Your Aircraft Engine
SIL98-9C
S u p e r s e d e s S IL 9 8 - 9 B
Techni cal P orti o ns
SUBJECT:
REASON FOR
REVISION:
PURPOSE:
Time Between Overhaul Periods
Incorporate new type certified
specifications and revise TBO limits
FA A A P P RO V E D
engine
Provides time limits between major overhauls
COMPLIANCE: See contents
MODELS
AFFECTED:
ALL
General Information
Continental Motors Inc.(CMI) provides operational limitations and instructions for your engine
along with the requirements for continued airworthiness as specified in the engine Operators,
Maintenance, and Overhaul Manuals and Service Bulletins. The Time Between Engine Overhaul
(TBO) provided in this document applies only to engines that have been operated and maintained
in accordance with these instructions. Engine mounted components and accessories require
overhaul at the same hourly and calendar intervals as the engine, unless otherwise specified by the
component or accessory manufacturer.
An engine’s published TBO DOES NOT mean that every engine will operate the number of hours
or years listed without requiring component replacements and/or unscheduled maintenance
events. Noncompliance with CMI instructions for continued airworthiness, operational and/or
environmental factors may necessitate repair or replacement of the engine, engine components
and accessories earlier than the published TBO.
TBO periods were established on most CMI engines beginning in the 1960s. Since that time, CMI
has made significant engineering improvements to virtually all major engine components. CMI
has refined manufacturing processes and implemented computer numerical controlled (CNC)
machining tools enabling CMI factory engines to meet higher standards than possible when CMI
engines were originally granted FAA Type Certificates. These improvements have enabled CMI
to increase TBO limits for many of our new and rebuilt engines.
CMI recommends the following factors be used, along with the engine’s published TBO, to
determine the engine’s continued airworthiness:
1. Whether the engine has been operated regularly or has been in storage, as gaskets,
seals and synthetic and natural rubber goods deteriorate over time. Environmental
corrosion can occur internally and externally on the engine. This naturally occurring
process can affect continued airworthiness of the engine and engine mounted
components and accessories. Replace or overhaul the engine no later than twelve
(12) years from date placed in service, or on accumulation of the operating hours
listed in Table 1 for the engine model.
ISSUED
REVISED
1998/11/17
2013/07/17
©2013 Continental Motors, Inc.
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P.O. Box 90 Mobile, AL 251-436-8299 SIL98-9
REVISION
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2. For engines used in aerial spraying, TBO is 1200 hours or twelve (12) years
whichever occurs first.
3. Engines used in parachute jumping, glider towing, banner towing, blimp propulsion,
or other unusually stressful applications may require more frequent overhauls than
listed.
4. The quality of parts, accessories and workmanship utilized during routine
maintenance, engine top overhaul and major overhaul has a direct effect on the
service life of the engine. Also, the maintenance and condition of engine-related
components - including, but not limited to, propeller, propeller governor, vacuum
pump, gear driven alternator, mount, baffles, instrumentation, and controls has a
direct effect on engine durability. The TBO periods listed are predicated on the
engine having been maintained according to the Instructions for Continued
Airworthiness, accepted by the FAA, specified in the engine Maintenance Manual,
Overhaul Manual, and Service Bulletins and operated within the limitations
published in CMI Engine Operators Manual and the aircraft manufacturer’s Aircraft
Flight Manual / Pilots Operating Handbook (AFM / POH).
5. CMI does not provide a TBO for engines that:
• Have been assembled with parts not supplied by CMI
• Have been assembled with parts that do not conform to the original FAA approved
type design for the engine
• Have been modified from the original type certificate configuration
• Have been overhauled or repaired in a manner that is inconsistent with the
specifications, limits, and instructions provided in the CMI Instructions for
Continued Airworthiness and FAA Airworthiness Directives
6. The “Hobbs Meter” is commonly used by the aviation industry as an acceptable
device to record time elapsed while electrical power is applied to the device. The
conditions under which the Hobbs Meter records operation vary widely within the
aviation industry. Continental Motors does not specify a method to record engine
operating hours, rather CMI defers to the end application installer.
NOTE: The TBO periods specified in this document are only estimates
and do not reflect warranty periods. For engine warranty coverage, refer
to the official Continental Motors Aircraft Engine Warranty received with
the engine.
ISSUED
REVISED
1998/11/17
2013/07/17
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P.O. Box 90 Mobile, AL 251-436-8299 SIL98-9
REVISION
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Engine Model Time Between Overhaul
TABLE 1. Engine Time Between Overhaul
HOURS
SEE NOTE
ENGINE
S/N
BEFORE
1006000
ENGINE
S/N
1006000
AND LATER
YEARS
1
1800
N/A
12
1, 2
1800
2000
12
1
2000
2000
12
IO-240-A, B
1, 2
2000
2200
12
IOF-240-B
1, 2
2000
2200
12
IO-346-A
1
1500
N/A
12
C125, C145 Series and O-300-A, B, C, D
1
1800
N/A
12
GO-300-A, C, D, E
1
1200
N/A
12
IO-360-A, AB, B, C, D, G, H, J, K
1
1500
1500
12
IO-360-CB, DB, GB, HB, JB
1, 2
1500
1700
12
IO-360-ES, KB
1, 2
2000
2200
12
TSIO-360-A, AB, B, C, D, E, F, H
1
1400
1400
12
LTSIO-360-E
1
1400
1400
12
TSIO-360-CB, DB, HB, JB
1, 2
1400
1600
12
L/TSIO-360-EB, FB, GB, KB, LB, MB, RB, SB
1, 2
1800
2000
12
E165, E185, E225 Series
1
1500
N/A
12
O-470-A, B, E, G, N, P
1
1500
N/A
12
1, 2
1500
1700
12
1, 2, 3
2000
2200
12
1, 2
1500
1700
12
TSIO-470-B, C, D
1
1400
N/A
12
IO-520-B, BA, C, M
1
1700
1700
12
IO-520-A, BB, CB, D, E, F, J, K, L, MB
1, 2
1700
1900
12
L/IO-520-P
1, 2
2000
2200
12
1
1200
N/A
12
GTSIO-520-C, D, H
1, 4
1600
N/A
12
GTSIO-520-L, M, N
1
1600
1600
12
TSIO-520-B, D, E, J, K, L, N, NB
1
1400
1400
12
TSIO-520-BB, C, DB, EB, G, H, JB, KB, LB, M, P, R, T
1, 2
1400
1600
12
TSIO-520-NB
1, 2,
1600
1800
12
1, 2, 5
1600
1800
12
1, 2
1600
1800
12
Engine Model
A65, A75 and C75, C85, C90 Series
O-200-A, B
O-200-D
O-470-J, K, L, M, R, S, U
O-470-U
IO-470-C, D, E, F, G, H, J, K, L, M, N, P, R, S, U, V, VO
GTSIO-520-C, D, F, H, K
TSIO-520-M, P, R
TSIO-520-AF, CE, UB, VB, WB
ISSUED
REVISED
1998/11/17
2013/07/17
PAGE NO
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P.O. Box 90 Mobile, AL 251-436-8299 SIL98-9
REVISION
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TABLE 1. Engine Time Between Overhaul
HOURS
Engine Model
SEE NOTE
ENGINE
S/N
BEFORE
1006000
ENGINE
S/N
1006000
AND LATER
L/TSIO-520-AE
1, 2
YEARS
2000
2200
12
TSIO-520-BE
1, 2
2000
2200
12
IO-550-A, B, C, D, E, F, L
1, 2
1700
1900
12
IO-550-G, N, P, R
1, 2
2000
2200
12
IOF-550-N
1, 2
2000
2200
12
TSIO-550-B, E
1, 2
1600
1800
12
TSIO-550-C, G, K, N
1, 2
2000
2200
12
TSIOF-550-D, J, K
1, 2
2000
2200
12
TSIOL-550-A, B, C
1
2000
2000
12
6-285 Series
1
1200
N/A
12
1. If an engine consistently accumulates 40 or more hours per month since being placed in service, add 200 hours to recommended TBO.
2. Engines with Serial Number 1006000 or higher, add 200 hours to TBO as noted in table above.
3. Applies to: new and rebuilt O-470U Model Specifications 11, 12, 13, 14, 17, 18, and subsequent numbers. 
O-470-U engines, other than those listed above, may be made eligible for the 2000 hours TBO with the installation of new P/
N 646267A2, or superseding cylinder and valve assemblies, P/N 648029 pistons, or superseding part number, P/N 649226
ring sets, or superseding part number, exhaust lifters P/N 646277, or superseding part number, oil pump with integral oil filter
adapter P/N 643779, or superseding part number, oil pump gasket P/N 643749, or superseding part number, oil filter P/N
649923, or superseding part number and two each P/N 402129P003 studs. Piston pin P/N 539467 must be replaced with a
new pin of the same P/N. Crankshaft counterweight pin and plate configuration must conform to the current illustrated parts
catalog. A log book entry is required. Update engine data plate with the correct engine model and specification number as follows: O-470U(1) converts to O-470-U(13); O-470-U(2) converts to O-470-U(14); O-470-U(3) converts to O-470-U(17); O-470U(4) converts to O-470-U(18); O-470-U(5) converts to O-470-U(17); O-470-U(6) converts to O-470-U(18)
4. Applies to GTSIO-520-C, D, H engine models listed utilizing cylinder part number 653453, or superseding (cylinder production
released APRIL 1993-verify part number on cylinder flange). Also, all parts must be replaced as directed by the applicable current service bulletins, illustrated parts catalogs, and overhaul manuals. A log book entry is required.
5. Applies to new and rebuilt TSIO-520-M Spec. 6, 7, and 8; TSIO-520-P Spec. 5 and 6; TSIO-520-R Spec. 7, 9, 10, and 11; New
and rebuilt TSIO-520-M, P, and R model engines with subsequent specification numbers.
TSIO-520-M, P, and R engines except those listed above may be eligible for a 1600 hour TBO increase by installing: new cylinder and valve assemblies P/N 646657A1, or superseding part number, pistons P/N 648044, or superseding part number,
ring sets P/N 649227, or superseding part number, exhaust valve lifters P/N 646277, or superseding part number, throttle
body P/N 649185A4, or superseding part number, CMI P/N 646957, or superseding part number, R.H. magneto, P/N 646958,
or superseding part number, L.H. magneto, P/N 636951, or superseding part number, Harness, or EQ6583 pressurized magneto and harness kit, oil pump assembly P/N 643717-1, or superseding part number, P/N 643749, or superseding part number, oil pump gasket, and oil filter with integral filter adapter P/N 649923 or, superseding part number.
To install a new oil pump, remove one each P/N 402159 and P/N 402157 stud. Replace stud P/N 401852 with stud P/N
402129P003 and install spacer P/N 646582-1.35 and P/N 646582-2.00 on existing studs after oil pump is installed. A log book
entry is required. Update engine data plate with the correct engine model and specification number as follows: TSIO-520-M(1)
converts to TSIO-520-M(6); TSIO-520-M(2) converts to TSIO-520-M(7); TSIO-520-M(3) converts to TSIO-520-M(7); TSIO520-P(1) converts to TSIO-520-P(5); TSIO-520-P(2) converts to TSIO-520-P(6); TSIO-520-P(3) converts to TSIO-520-P(6);
TSIO-520-R(1) converts to TSIO-520-R(9); TSIO-520-R(3) converts to TSIO-520-R(10); TSIO-520-R(4) converts to TSIO520-R(9); TSIO-520-R(5) converts to TSIO-520-R(10); TSIO-520-R(6) converts to TSIO-520-R(11)
ISSUED
REVISED
1998/11/17
2013/07/17
PAGE NO
4 of 4
P.O. Box 90 Mobile, AL 251-436-8299 SIL98-9
REVISION
C
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