Service Instruction S.I. No.
: 02-8
ENGINE COMPONENTS, INC. Page: 1 of 2
Issued: 10/17/03
Title: O-200 VALVE TRAIN UPGRADE Revision: 2 (06/15/07)
Technical Portions are FAA DER Approved.
1.0 PURPOSE: Continued airworthiness instructions and installation eligibility of new Engine Components, Inc. (ECi®) valve
train components for TCM C/200/300 series engines using ECi Cylinders (P/N AEC65314).
2.0 MODELS AFFECTED: ECi Cylinders (P/N AEC65314) installed on Teledyne Continental C, 200, and 300 Series
Engines listed below.
3.0 ENGINE APPLICABLITY:
PART NO. DESCRIPTION INSTALLATION ELIGIBILITY
AEC531629 Rotocoil Assembly C-75-8, 8F, 8FH, 8FHJ, 8FJ, 8J, 12, 12B, 12BF, 12BFH, 12F, 12FH,
12FHJ, 15, 15F, 15J, FJ, J, 12J;
AEC531609 Spring, Valve, Outer C-85-8, 8F, 8FHJ, 8FJ, 8J, 12, 12F, 12FH, 12FHJ, 12FJ, 12J, 14F, 15, 15F;
Spring, Valve C-90-8F, 8FJ, 12F, 12FH, 12FJ, 12FP, 14F, 14FH, 14FJ, 16F;
AEC531610 C-115-1, 2;
Intermediate
C-125-1, 2;
AEC531611 Spring, Valve, Inner C-145-2, 2H, 2HP;
AEC21154 Shaft, Rocker O-200-A, B, C;
O-300-A, B, C, D, E;
AEL11665 Thrust Button GO-300-A, B, C, D, E, F
4.0 ELIGIBILITY:
4.1 Parts may be grouped into the following configurations. Configurations not listed herein are strictly prohibited.
4.1.1 Rotocoil Group: Rotocoil (AEC531629) and springs (AEC531609, AEC531610, & AEC531611) must be
used together. There are no approved alternates to these parts.
4.1.2 Rocker Shaft: Rocker Shaft (AEC21154) may be used with any approved cylinder and/or rocker arm.
4.2 Any combination of the four approved configurations are approved. For example, the Rotocoil Group may be used
with the Rocker Shaft, Exhaust Valve and Guide, or neither or both.
5.0 FEATURES:
5.1 The AEC531629 Rotocoil is a scaled version of the AEC652112 Rotocoil, which is used on TCM 470, 520, and 550
Series Engines.
5.2 The valve springs AEC531609, AEC531610, and AEC531611 are designed to function with the AEC531629
Rotocoil. The rotocoil is not approved for use with any other valve springs.
The installation of rotocoils is made to provide a slight positive valve rotation and inhibit the formation of carbon and
lead salts in the valve guide. This rotation also inhibits premature valve and guide wear. Engine testing accomplished at
ECi has shown that cylinders with rotocoils experience much lower valve and guide wear, especially when using 100LL
fuel.
T113
Corporate Office • 9503 Middlex • San Antonio, TX 78217 • Tel (210) 820-8100 • Fax (210) 820-8103 • 800-ECi-2FLY (800-324-2359)
www.eci2fly.com • sales-service@eci2fly.com • FAA Repair Station #AG2R689K
Airmotive Steel, Classic Cast, CermiNil, Cermicrome, CermiSteel, Double Band, Engine Redi, Electro-Fusion, EC Focus, Freedom, IFR, Nerodize, Q3, Q4, Q5 & TITAN are Trademarks of ENGINE COMPONENTS, INC.
ENGINE COMPONENTS, INC.
Service Instruction No. 02-8 Revision 2 (06/15/07)
O-200 VALVE TRAIN UPGRADE
Page 2 of 2
6.0 REPAIR/OVERHAUL:
6.1 Valve springs may be reused at overhaul if they meet the following load criteria.
PART NUMBER LENGTH (INCH) LOAD (LBS)
1.30 33 – 37
AEC531609
0.91 58 – 63
1.27 25 – 28
AEC531610
0.88 38 – 44
1.20 10 – 13
AEC531611
0.82 27 – 30
6.2 ECi recommends returning the rotocoils to ECi for evaluation and test at overhaul. One tendency for rotocoils is for
the coil spring inside to wear a flat spot, which stops providing positive rotation. ECi has a test bench that can
validate the operation of the rotocoil without disassembly.
7.0 EXHAUST VALVE AND VALVE GUIDE INTERCHANGEABILITY:
7.1 Old style cylinders (Class 61.0) were fitted with aluminum-bronze exhaust guides P/N AEC24047 and plain-steel stem
exhaust valves P/N AEC646612.
7.2 New style cylinders (Class 61.1) are now fitted with high-chrome, Ni-resist exhaust valve guides P/N AEC655526HC
and chrome-flashed stem exhaust valves P/N AEC655971.
7.3 Exhaust valves MUST be used with the correct exhaust guides to ensure proper compatibility a shown below:
Exhaust Guide
Cylinder Class Used with Exhaust Valve
Part Number Material
61.0 AEC24047 Aluminum-bronze AEC646612 (plain stem)
61.1 AEC655526HC Ni-resist AEC655971 (chrome-flashed stem)
