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Airmotive Steel, CermiNil, Double Band, ECi, EXP, FREEDOM, IFR, Nickel+Carbide, Q3, Q4, Q5, TITAN and TITAN Advanced are Trademarks or Registered Trademarks of ENGINE COMPONENTS, INC. 

T113

Service Instruction S.I. No.: 99-8-1 

ENGINE COMPONENTS, INC. Page: 1 of 9 

Issued: 08/25/99 

Revision: 9 (2/23/2009) 

Title: ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

1.0 PURPOSE: Continued Airworthiness Instructions. 

2.0 SCOPE: Engine Components, Inc. (ECi®) has obtained FAA Engineering Design Approval for new cylinders eligible 

for installation on TCM 470/520/550 series engines. This Service Instruction provides installation eligibility for PMA 

parts and assemblies and provides documentation required by the FAA under FAR Part 33.4 and Appendix A for 

continued airworthiness. If a specific procedure is not addressed in this Service Instruction, the applicable procedure in 

the OEM’s current overhaul and/or Service Bulletin and Service Instruction applies. 

3.0 COMPLIANCE: Anytime cylinders are installed or removed for overhaul or repair. 

4.0 IDENTIFICATION: 

4.1 470 Short Reach Spark Plug Applications 

4.1.1 Cylinder Marking

PART NO. .......... A E C 6 3 1 3 9 7 _ _ 68.3 REV _ FAA-PMA _ 

 

BORE TYPE ................................................. 

ST = Thru-hardened Steel 

SN = Nickel+CarbideTM 

ECi® CLASS ........................................................... 

REVISION LEVEL .................................................................. 

FAA-PMA MARKING ....................................................................... 

PISTON ................................................................................................... 

A = AEC646263 (Low Compression) 

B = AEC654721 (High Compression) 

4.1.2 Price List Designation

 TI _ _ 68.3 _ _ _ 

TITAN® BRAND ............................................. 

BORE TYPE ........................................................... 

ST = Thru-hardened Steel 

SN= Nickel+CarbideTM 

ECi® CLASS .................................................................. 

PISTON ................................................................................. 

A = AEC646263 (Low Compression) 

B = AEC654721 (High Compression) 

LEVEL OF COMPLETION .............................................................. 

SA = Stud Assembly 

VA = Valve Assembly 

CA = Complete Assembly

Technical Portions are FAA DER Approved.
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 2 of 9

4.2 470 Long Reach Spark Plug Applications 

4.2.1 Cylinder Marking

PART NO. .......... A E C 6 3 1 3 9 7 _ _ 70.3 REV _ FAA-PMA _ 

 

BORE TYPE ................................................. 

ST = Thru-hardened Steel 

SN = Nickel+CarbideTM 

ECi® CLASS ........................................................... 

REVISION LEVEL .................................................................. 

FAA-PMA MARKING ....................................................................... 

PISTON ................................................................................................... 

A = AEC348029 (High Compression) 

B = 655988 (Low Compression) 

4.2.2 Price List Designation

 TI _ _ 70.3 _ _ _ 

TITAN® BRAND ............................................. 

BORE TYPE ........................................................... 

ST = Thru-hardened Steel 

SN= Nickel+CarbideTM 

ECi® CLASS .................................................................. 

PISTON ................................................................................. 

A = AEC348029 (High Compression) 

B = 655988 (Low Compression) 

LEVEL OF COMPLETION ............................................................... 

SA = Stud Assembly 

VA = Valve Assembly 

CA = Complete Assembly 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 3 of 9

4.3 520 and 550 Series Straight Fin Barrel Applications 

4.3.1 Cylinder Marking

PART NO. .......... A E C 6 3 1 3 9 7 _ _ 71.4 REV _ FAA-PMA _ 

 

BORE TYPE ................................................. 

ST = Thru-hardened Steel 

SN = Nickel+CarbideTM 

ECi® CLASS ........................................................... 

REVISION LEVEL .................................................................. 

FAA-PMA MARKING ....................................................................... 

PISTON ................................................................................................... 

A = AEC648045 (IO-520 High Compression) 

B = AEC648044 (TSIO-520 Low Compression) 

C = AEC654857 (IO-550) 

4.3.2 Price List Designation

 TI _ _ 71.4 _ _ _ 

TITAN® BRAND ............................................. 

BORE TYPE ........................................................... 

ST = Thru-hardened Steel 

SN= Nickel+CarbideTM 

ECi® CLASS .................................................................. 

PISTON ................................................................................. 

A = AEC648045 (IO-520 High Compression) 

B = AEC648044 (TSIO-520 Low Compression) 

C = AEC654857 (IO-550) 

LEVEL OF COMPLETION ............................................................... 

SA = Stud Assembly 

VA = Valve Assembly 

CA = Complete Assembly 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 4 of 9

4.4 550 Series Tapered Fin Barrel Applications 

4.4.1 Cylinder Marking

PART NO. .......... A E C 6 3 1 3 9 7 _ _ 76.3 REV _ FAA-PMA 

 

BORE TYPE ................................................. 

ST = Thru-hardened Steel 

SN = Nickel+CarbideTM 

ECi® CLASS ........................................................... 

REVISION LEVEL .................................................................. 

FAA-PMA MARKING ....................................................................... 

4.4.2 Price List Designation

 TI _ _ 76.3 _ _ 

TITAN® BRAND ............................................. 

BORE TYPE ........................................................... 

ST = Thru-hardened Steel 

SN= Nickel+CarbideTM 

ECi® CLASS .................................................................. 

LEVEL OF COMPLETION ........................................................ 

SA = Stud Assembly 

VA = Valve Assembly 

CA = Complete Assembly 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 5 of 9

5.0 MODELS AFFECTED

470 Series 

Complete 

Assembly 

Cylinder Class 

Cylinder Stud 

Assembly No. Bore Type Intake Seat 

Spark 

Plug 

Length

Piston P/N C.R. Installation 

Eligibilty 

TIST68.0ACA AEC631397ST68.0 Thru-hardened Steel AEC642318 Short 

TISN68.0ACA AEC631397SN68.0 Nickel+CarbideTM AEC642318 Short 

AEC646263 7:1 

0-470-K, K-CI, L, LCI, R, S 

TIST68.0BCA AEC631397ST68.0 Thru-hardened Steel AEC642318 Short 

TISN68.0BCA AEC631397SN68.0 Nickel+CarbideTM AEC642318 Short 

AEC654721 8:1 

0-470-G, G-CI, M, 

M-CI, N, P 

IO-470-A, C, G, P, 

R, T 

LIO-470-A 

TIST68.3ACA AEC631397ST68.3 Thru-hardened Steel AEC642318-1 Short 

TISN68.3ACA AEC631397SN68.3 Nickel+CarbideTM AEC642318-1 Short 

AEC646263 7:1 

0-470-K, K-CI, L, LCI, R, S 

TIST68.3BCA AEC631397ST68.3 Thru-hardened Steel AEC642318-1 Short 

TISN68.3BCA AEC631397SN68.3 Nickel+CarbideTM AEC642318-1 Short 

AEC654721 8:1 

0-470-G, G-CI, M, 

M-CI, N, P 

IO-470-A, C, G, P, 

R, T 

LIO-470-A 

TIST70.0ACA AEC631397ST70.0 Thru-hardened Steel AEC642318 Long 

TISN70.0ACA AEC631397SN70.0 Nickel+CarbideTM AEC642318 Long 

AEC648029 8.6:1 

0-470-T, U 

IO-470-D, E, F, H, 

L, LO, M, N, S, U, 

V, VO 

TIST70.0BCA AEC631397ST70.0 Thru-hardened Steel AEC642318 Long

TISN70.0BCA AEC631397SN70.0 Nickel+CarbideTM AEC642318 Long

655988 7.5:1 TSIO-470-B, C, D 

TIST70.3ACA AEC631397ST70.3 Thru-hardened Steel AEC642318-1 Long 

TISN70.3ACA 

AEC631397SN70.3 Nickel+CarbideTM AEC642318-1 Long 

AEC648029 8.6:1 

0-470-T, U 

IO-470-D, E, F, H, 

L, LO, M, N, S, U, 

V, VO 

TIST70.3BCA AEC631397ST70.3 Thru-hardened Steel AEC642318-1 Long

TISN70.3BCA AEC631397SN70.3 Nickel+CarbideTM AEC642318-1 Long

655988 7.5:1 TSIO-470-B, C, D 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 6 of 9

520/550 Series 

Complete Assembly 

Cylinder Class 

Cylinder Stud 

Assembly No Bore Type Intake Seat Piston P/N C.R. Installation Eligibility 

TIST71.2ACA AEC631397ST71.2 Thru-hardened Steel AEC642318

TISN71.2ACA AEC631397SN71.2 Nickel+CarbideTM AEC642318

AEC648045 8.5:1 

IO-520-A, B, BA, BB, 

C, CB, D, E, F, J, K, 

L, M, MB, N, NB, P 

LIO-520-P 

TIST71.2BCA AEC631397ST71.2 Thru-hardened Steel AEC642318

TISN71.2BCA AEC631397SN71.2 Nickel+CarbideTM AEC642318

AEC648044 7.5:1

TSIO-520-A, AF, B, 

BB, C, CE, D, DB, E, 

EB, G, H, J, JB, K, 

KB, L, LB, M, N, 

NB, P, R, T, U, UB, 

VB, WB 

TIST71.2CCA AEC631397ST71.2 Thru-hardened Steel AEC642318

TISN71.2CCA AEC631397SN71.2 Nickel+CarbideTM AEC642318

AEC654857 8.5:1

IO-550-A, B, C 

IOF-550-B, C 

TIST71.4ACA AEC631397ST71.4 Thru-hardened Steel AEC642318-1

TISN71.4ACA AEC631397SN71.4 Nickel+CarbideTM AEC642318-1

AEC648045 8.5:1

IO-520-A, B, BA, BB, 

C, CB, D, E, F, J, K, 

L, M, MB, N, NB, P 

LIO-520-P 

TIST71.4BCA AEC631397ST71.4 Thru-hardened Steel AEC642318-1

TISN71.4BCA AEC631397SN71.4 Nickel+CarbideTM AEC642318-1

AEC648044 7.5:1

TSIO-520-A, AF, B, 

BB, C, CE, D, DB, E, 

EB, G, H, J, JB, K, 

KB, L, LB, M, N, 

NB, P, R, T, U, UB, 

VB, WB 

TIST71.4CCA AEC631397ST71.4 Thru-hardened Steel AEC642318-1

TISN71.4CCA AEC631397SN71.4 Nickel+CarbideTM AEC642318-1

AEC654857 8.5:1 

IO-550-A, B, C 

IOF-550-B, C 

TIST76.0CA AEC631397ST76.0 Thru-hardened Steel AEC642318 

TISN76.0CA AEC631397SN76.0 Nickel+CarbideTM AEC642318

AEC654857 8.5:1

IO-550-D, E, F, L 

IOF-550-D, E, F, L1

TIST76.3CA AEC631397ST76.3 Thru-hardened Steel AEC642318-1

TISN76.3CA AEC631397SN76.3 Nickel+CarbideTM AEC642318-1

AEC654857 8.5:1

IO-550-D, E, F, L 

IOF-550-D, E, F, L 

 

1

 The 76 classes use a tapered fin barrel instead of the standard straight fin typical for all other installations. 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 7 of 9

MARKING: (See Figure 1) 

6.1 New head and new through-hardened steel barrel:

6.1.1 Serial number stamped on head. 

6.1.2 Cylinder assembly number marked on barrel 

flange. 

6.2 New head, new through-hardened steel barrel with 

Nickel+CarbideTM process coating: 

6.2.1 Serial number stamped on the head. 

6.2.2 Barrel PMA number vibropeened on barrel flange. 

6.2.3 Cylinder assembly number marked on barrel flange 

7.0 CYLINDER REMOVAL AND INSTALLATION: See ECi 

Service Instruction 92-9-6. 

8.0 COLOR CODES ON CYLINDERS: See ECi Service 

Instruction 92-7-1. 

9.0 TIME BETWEEN OVERHAUL (TBO): ECi has addressed the subject of TBO through test and computation, 150 hour 

certification testing and durability testing with extended test cell run time. From all of the data that has been acquired and

analyzed, TBO recommendations that have been established for the latest OEM cylinders also apply to ECi cylinders in 

similar applications. 

10.0 CYLINDER HEAD: 

10.1 Material: The cylinder heads are sand castings manufactured from the TITANTM Advanced TM Aluminum Alloy. 

This alloy incorporates a composition derived from both AMS 4220 and RR350 alloys. The casting is solution heattreated and overaged before assembly. 

10.2 Thread Design: The cylinder head is machined in the barrel attachment area to make it compatible with the OEM 

barrel thread design as well as ECi barrel threads. 

10.3 Head Inspection: Head inspection shall be performed in accordance with the OEM overhaul manual. Minor 

cooling fin cracks that do not extend into the cylinder head structure and heat checks in the exhaust port less than 

1/8” in length are acceptable for return to service. All other cracks make the cylinder unairworthy without major 

repair. 

10.4 Disassembly and Reassembly: Disassembly and reassembly of the cylinder head and barrel is deemed to be a 

major repair and must be accomplished in accordance with FAA approved procedures. The preload (interference 

fit), alignment and compression height between head and barrel must be approved by FAA engineering. 

10.5 Exhaust Studs: The cylinder head is fitted with stainless steel, Rosan type studs, P/N AEC638125-2. 

10.6 Parts Installation: OEM and FAA-PMA approved replacement parts may be installed in ECi cylinder heads using 

interference fit data and installation procedures contained in the OEM’s current overhaul manual. (See ECi Class 

Reference Manual for parts eligibility and paragraph 10.7 below, “Injector Boss Bushing”.) 

10.7 Injector Boss Bushing: 

10.7.1 Description: The injector boss bushing, P/N AEC65389, is a stainless steel bushing that has a 1⁄2-20 UNF 

thread on the O.D. and a 1/8-27 NPTF on the I.D. to accept the injector. The bushing is held in place with 

Locktite 620 or equivalent. 

10.7.2 Inspection: The bushing does not have to be removed when using NDT methods for detection of cracks. 

However, if leakage or a crack running into the boss is evident or suspected, the bushing should be 

removed. 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 8 of 9

10.7.3 Repair: If inspection of the torqued thread in the bushing reveals thread damage, the threads can be chased 

with a 1/8-27 NPTF tap. BEFORE inserting the tap, check the size of the threaded hole to insure that the 

bushing has not been previously tapped beyond service limits. This check can be made by inserting a 3/8-

24 UNF bolt into the pipe tapped bushing and noting the number of turns required to bottom the bolt. The 

number of turns cannot exceed seven (7) AFTER chasing. Proceed with the thread chasing operation if 

sufficient material is present but do not exceed the limits set forth above. Remove and replace the bushing 

if the chasing operation does not remove thread damage or if the size of the threads exceeds service limits. 

10.7.4 Removal and Replacement: Remove the damaged bushing with an Eze-Out. If required, make weld repairs 

in accordance with paragraph 10.8.2 below and remachine the threads in the head. Clean boss and bushing 

with alcohol; blow dry with compressed air. Spray injector boss with primer and allow to dry 3-5 minutes. 

Then, apply 620 Loc-tite generously to bushing and on first thread of cylinder boss. Install bushing until 

flange is in contact with injector boss. Check with a torque wrench set at 75-85 in-lbs. Remove excess Loctite with alcohol and a shop towel. 

10.7.5 Injector Torque: The injector must be torqued to 55-65 in-lbs (4.6-5.4 ft/lbs) to insure no leakage. 

10.8 Weld Repairs: 

10.8.1 Minor welds are defined as welds to the following areas: 

 (a) Intake and exhaust port faces. 

 (b) Rocker cover flange and threaded holes. 

 (c) Cooling fins. 

10.8.1.1 The welding process must be based on FAA acceptable data and must be performed by a 

properly rated FAA Certified Repair Station or foreign equivalent. Filler rod AA 4043 or 

equivalent, correctly work hardened, is approved for minor repairs. 

10.8.2 Major welds are defined as welds to structural areas of the cylinder and may be performed if all of the 

following criteria are met: 

(a) The welding process must be based on FAA approved data and meet all of the requirements of FAA 

advisory Circular No. 33-6 dated December 20, 1994. 

(b) The welding must be performed by a properly rated FAA Certificated Repair Station. 

(c) The filler rod must be heat treatable and approximate the casting alloy. 

(d) After welding, the repaired casting must be solution heat treated and overaged. 

(e) After machining and parts installation, the hardness of the weldment will be Brinell 60-75 (500 kg 

load, 10mm ball). 

11.0 CYLINDER BARREL: 

11.1 Material: A cylinder barrel manufactured by ECi is made from AISI 4140 steel. The barrel will be throughhardened and the bore may be coated with a corrosion and wear resistant coating. 

11.2 Disassembly and Reassembly: (See Cylinder Heads) 

11.3 Weld Repairs: No weld repairs of any kind are permitted on any surface of the barrel. 

11.4 Oversizing: ECi through-hardened barrels may be oversized to 0.015” to accommodate oversize pistons and rings 

or to 0.020” prior to applying a metal additive process. 

11.5 Plating: ECi through-hardened barrels may be plated back to standard using FAA approved data. Consult the 

plating source for the proper ring material to be used with the bore coating. 

11.6 Bore Inspection: Whenever a cylinder is removed from an engine, the diameter and out-of-round condition of the 

bore should be measured as well as visual checks made for scoring, galling, low spots and ring breakage. 
 Service Instruction No. 99-8-1 Revision: 9 (2/23/2009) 

ECI® TITAN® REPLACEMENT CYLINDERS FOR TCM 

470/520/550 SERIES ENGINES

Page 9 of 9

 Inspection results should be compared to the dimensions in Figures 2 and 3 below and in the OEM’s current 

overhaul manual (ECi data will prevail in the event of conflict). Affix a repairable or rejected part tag, as 

appropriate, to any cylinder that does not meet the service limit (or properly oversized) bore criteria. 

12.0 PISTON RINGS: See ECi Service Instruction No. 94-4-1, ECi Piston Ring Sets Application, Fitting instructions and 

Reference for proper fitting of piston rings. 

Figure 2

Typical Cross Section of

470/520/550 Cylinder Bore

FIGURE 3 

Bore Dimensions

STANDARD MAX SERVICEABLE 

STANDARD 

AMOUNT OF 

CHOKE FROM Engine 

Type 

“A” 

DIM. 

“B” 

DIM. 

“C” 

DIM. 

“D” 

DIM. 

“E” 

DIA. “F” 

DIA. 

CIRCULARITY 

T.I.R. 

“F” 

DIA. 

CIRCULARITY 

T.I.R. 

ALLOWABLE 

TAPER 

FROM 

“F” TO “G” “G” to “H” “H” to “J” 

TOTAL 

CHOKE 

“G” TO 

“J” 

470 6.500 5.750 4.500 1.150 5.0040/5.0010 5.0030/5.0010 .002 5.006 .004 --.000/-.001 -.001/-.003 -.003/-.006 -.004/-.009 

520/550 6.500 5.750 4.500 1.150 5.2540/5.2510 5.2530/5.2510 .002 5.256 .004 -.000/-.001 -.001/-.003 -.003/-.006 -.004/-.009