CONTINENTAL AEROSPACE TECHNOLOGIES SERVICE BULLETIN SB15-6C
CATEGORY 3
CONTINENTAL AEROSPACE TECHNOLOGIES?
SB15-6C
SERVICE BULLETIN
Contains Useful Information Pertaining To Your Aircraft Engine
S upe rse de s S B 1 5- 6 B
T E CH N IC AL PO RT IO NS
SUBJECT:
NiC3? Cylinder Assemblies
PURPOSE:
Provide dimensional fits and limits
FAA APPROVED
COMPLIANCE: At cylinder repair, replacement, or engine major overhaul
MODELS
AFFECTED:
New and rebuilt Continental Aerospace Technologies E165, E185, E225,
IO346, O470, IO470, TSIO470, GTSIO520, IO520, LIO520, LTSIO520,
TSIO520, IO550, IOF550, TSIO550, and TSIOF550 aviation gasoline (AvGas)
engines.
I. GENERAL INFORMATION
Continental Aerospace Technologies? (Continental?) NiC3 cylinders are offered as an optional
replacement for nitride or through-hardened steel cylinders. The nickel carbide plating process
applies a corrosion and wear resistant protective coating to the interior cylinder barrel surface.
Currently, cylinders with 5.00" and 5.25" bore diameters are available. NiC3 cylinder offerings
will expand to our full product line in the future.
Continental has standardized cylinder bore and ring gap dimensions for NiC3 cylinders through
improved manufacturing techniques. The latest cylinder designs feature tighter bore and choke
tolerances and have been incorporated within this service document.
This service bulletin provides the following information:
1. Identification of Nickel Carbide (NiC3?) cylinders
2. Compatibility with existing cylinders
3. Cylinder fits & limits, bore dimensions; new minimum/maximum and service limits (for
continuing subject cylinders in service between major overhaul(s))
4. Cylinder removal, cleaning, and installation procedures
5. Piston ring assemblies and dimensions; piston ring gaps, and designated location in
subject cylinder to measure ring gaps
6. Piston ring installation
7. Follow-on maintenance
NOTE: Follow the ¡°Flight Check¡± and ¡°Break-in¡± instructions in
M-0, Standard Practice Maintenance Manual, Section 7-2.4. for
engines fitted with NiC3 cylinders.
ISSUED
2015/10/15
REVISED
2019/09/27
?2019 Continental Motors, Inc.
DOC NO REVISION
SB15-6
C
P.O. Box 90 Mobile, AL 251.436.8299
PAGE
1 of 16
II. APPLICABILITY
This Service Document updates the manufacturer's Instructions for Continued Airworthiness
(ICA).
A copy of this Service Bulletin must be inserted into the most current version of the applicable
Maintenance or Overhaul manuals (as listed in the ¡°Models Affected¡±) and should be added to the
appropriate engine cylinder maintenance section until the data is incorporated into the manual by
revision, or until the service document is retired.
Manual
Part No.
Engine Applicability
Manual
Section
M-11
IO-520 Permold
19-21
M-16
IO-550 Permold
10-8
M-18
TSIO-550 Permold
10-8
M-24
IOF-550-A, B, C, G, N, P & R
10-8
M-26
TSIOF-550
10-9
OH-24
IOF-550
D-5
X30016
E-165, E-185, E-225
XV
X30027
IO-346
VII
X30033
TSIO-470
VIII
X30039
IO-520
6-XII
X30045
GTSIO-520
X30574
TSIO-520-B, BB, BE, D, DB, DB, E, EB, J, JB, K, KB, L, LB, N, NB, U, UB,
VB, WB Permold series
72-30-07 thru
72-40-15
X30575
LTSIO-520-AE?
TSIO-520-C, CE, G, H, M, P, R, T, AE, AF Sandcast series
72-30-07 thru
72-60-03
X30586
O-470-A, B, E, G, J, K, L, M, R, S, U
72-30-07 thru
72-60-03
X30588
IO-470-C, D, E, F, G, H, J, K, L, M, N, P, R, S, U, V, VO
72-30-08 thru
72-60-03
X30607
IO-550-D, E, F & L
72-30-07 thru
72-60-04
VII, IX, B-1
CAUTION: Do not return any cylinder to service that does not
conform to the dimensional limits specified in this service document.
Use only NEW cylinder bore dimensions at engine overhaul. Service limits may be used to return
cylinders to service on engines that have not reached published TBO. Authorized oversize (AO)
NiC3 cylinders are not available.
Maintain piston ring gaps and cylinder dimensions within the specifications provided in this
Service Bulletin.
? Piston specifications are presented in Section 10-6 of M-0, Standard Practice
Maintenance Manual, ¡°Engine to Piston Cross Reference Table¡±.
? Piston rings (manufactured with alternate materials) are required to interface with the
NiC3 cylinder bore. Piston rings must be marked accordingly.
? Published TBO limits are not affected by the installation of NiC3 cylinders.
ISSUED
2015/10/15
REVISED
2019/09/27
DOC NO REVISION
SB15-6
C
PAGE
2 of 16
III. CYLINDER IDENTIFICATION
Cylinder design and type can by identified by the following:
? Part numbers are permanently marked on the base flange flat (Figure 1, typical).
? The serial number of the assembly is stamped on the bottom cylinder head cooling fin.
? Two silver stripes, parallel with the cylinder bore, are applied to the edge of the
cylinder head fins between push rod tubes to identify the cylinder bore is treated with
nickel carbide plating.
Figure 1. Cylinder Identification
(5.250 Inch Cross-Flow Cylinder with Straight Barrel Fins Depicted)
IV. APPLICATION
NiC3 cylinder assemblies are available for the engines listed in Table 1, column 6. The NiC3
cylinder part numbers (columns 2 and 3) are optional aftermarket replacements for the throughhardened cylinder assemblies (column 4). NiC3 cylinder design underwent multiple
improvements in 2018, conforming barrel and piston ring dimensions to the through-hardened
products, allowing the same instructions and dimensional fits & limits to be used for either
product line. First generation NiC3 cylinder assembly dimensional specifications differ from the
through-hardened equivalent.
Verify the cylinder assembly part number (and revision) before checking any dimensions. For
cylinder assembly part numbers listed in Table 1, column 2; reference the cylinder, piston, and
piston ring dimensional limits in M-0, section 10-6 to install or repair the NiC3 cylinder
assemblies. If the cylinder assemblies are listed in Table 1, column 3 the instructions and
dimensional specifications in this service document must be used.
ISSUED
2015/10/15
REVISED
2019/09/27
DOC NO REVISION
SB15-6
C
PAGE
3 of 16
Table 1. Cylinder Part Number and Revision Cross Reference
NiC3
Production
Bore Cylinder (P/N)
5.00
5.25
NiC3
Cylinder (P/N)
(prior to 2018)
ThroughBarrel
Hardened
Fin
Cylinder Configur
(Ref)
ation
Applicability
658830
supersedes
658612 Rev. B
658612
Rev. A
658817 or
subsequent
straight
O470-U
IO470-D, E, F, H, L, M, N, S, U, V, VO
TSIO470-B, C, D
658829
supersedes
658614 Rev. B
658614
Rev. A
658816 or
subsequent
straight
O470-G, G-CI, K, L, M, M-CI, P, R, S
IO470-C, G, P, R
658831
supersedes
658626 Rev. A
658626
Rev. ~
658818 or
subsequent
straight
O470-A, E, J
IO470-J, K
658832
supersedes
658627 Rev. A
658627
Rev. ~
658819 or
subsequent
straight
E-165
E-185
E-225
O470-4, 7A, 7B, 11, 11-CI, 13, 13A, 15
658823
supersedes
658611 Rev. B
658611
Rev. A
658810 or
subsequent
straight
IO520-A, B, BA, BB, C, CB, D, E, F, J, K, L, M, MB
IO550-A, B, C
IOF550-B, C
TSIO520-AF, B, BB, C, CE, D, DB, E, EB, G, H, J, JB, K,
KB, L, LB, M, N, NB, P, R, T, UB, VB, WB
658833
supersedes
658613 Rev. B
658613
Rev. A
658820 or
subsequent
straight
IO550-G
TSIO520-BE
TSIO550-A, B, C, E
GTSIO520-H7, H8, K, L, M, N
658825
supersedes
658621 Rev. A
658621
Rev. ~
658812 or
subsequent
tapered
IO550-D, E, F, L
IOF550-D, E, F, L
658826
supersedes
658622 Rev. A
658622
Rev. ~
658813 or
subsequent
straight
L/TSIO520-AE
IO346-A, B
658827
supersedes
658623 Rev. A
658623
Rev. ~
658814 or
subsequent
tapered
IOF550-N, P, R
TSIOF550-D, J, K, P
658828
supersedes
658624 Rev. A
658624
Rev. ~
658815 or
subsequent
tapered
IO550-N, P, R
TSIO550-G, K, N
658824
supersedes
658630 Rev. A
658630
Rev. ~
658811 or
subsequent
straight
GTSIO520-C, D, H1, H2, H5, H6, H9, H10
Table 2. Engine to Piston Cross Reference
Manganese Phosphate
Coated Piston
Engine Model
Piston Diameter
Refer to the ¡°Engine to Piston Cross Reference Table¡± in Section 10-6 of M-0, Standard Practice Maintenance Manual
ISSUED
2015/10/15
REVISED
2019/09/27
DOC NO REVISION
SB15-6
C
PAGE
4 of 16
V. CYLINDER FITS & LIMITS
To determine cylinder bore circularity, measure first in the plane through the spark plug holes at
diameter ¡°F¡± in Figure 2; repeat the measurement at a right angle (90¡ã) to the first measurement
and subtract the smaller dimension from the larger. The difference must not exceed the circularity
limit specified.
WARNING
Verify the cylinder, piston, and piston ring assembly part
numbers are approved for the application. Installation of
incorrect, or mismatched parts will cause engine damage and
engine malfunction.
Figure 2. Cylinder Barrel Measurement Locations
ISSUED
2015/10/15
REVISED
2019/09/27
DOC NO REVISION
SB15-6
C
PAGE
5 of 16
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