I 

CO:\!TINEN'fAL lV10'fORS@ AIRCRAFT ENGINE 

CRITICAL SERVllCJE: BIULLKHN 

CO\Ill'Lli\NCE NECESSARY TO MAINTAIN S,\FETY 

SUBJECT: Oil Cooler Cross Fitting Replacement 

CATEGORY 2 

CSB15~2C 

SUPERSEDES CSB15-2B 

'JECHNIC .. \L I'OilTIOI\:S 

FAA APPROVED 

PURPOSE: To replace oil cooler cross fitting (part numbers AN918-1J and AN918-2J) 

with a new enhanced cross fitting (PIN 658607). 

COMPLIANCE: Within the next 25 hours of engine operation or the next scheduled inspection 

or engine servicing, whichever occurs first. 

~ 

MODELS 

AFFECTED: 

~ ~ ~ ~ ~ ~ New and rebuilt TSI0550-C5, -C7, -C8, -C9, -CIO, -Cll, -Cl2, -Cl3, -Cl7, - ~ ~ Cl8, -Cl9, -C20, -C2l; TSI0550-N; TSIOF550-D; TSIOF550-K aviation ~ gasoline (AvGas) engine models that use oil cooler cross fitting PINs AN918-1J ~ 

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l. GENERAL INFORMATION ~ 

Continental Motors, Inc. (CMI) is aware of some occurrences where a loss of engine oil resulted '-' 

from a fractured nipple fitting between the cross fitting and the oil cooler. Design improvements '' 

consolidate the oil cooler cross fitting stack-up into a single part, which significantly increases the ~ 

strength and provides a simplified procedure for installing the oil cooler cross fitting found on '-' 

specified TSI0-550 and TSIOF-550 engines. Modifications described herein on engine serial ~ 

numbers 1012296 and higher were accomplished at the factory. '-' 

WARNING ~ 

It is critical to follow ALL "Standard Practices" within your ~ Maintenance and Overhaul Manual when connecting fittings ~~ 

and hoses. ~~ 

ll. BACKGROUND INFORMATION 

CMI has made several design enhancements to the cross fitting configuration that provides 

lubricating oil to the turbocharger bearings, and, in some cases, the oil pressure sensor. 

Located in your M-18 (29 May 2015) or M-26 (15 September 2014), or later revision, 

Maintenance and Overhaul Manuals: 

1. Chapter 17 provides detailed jnstructions on installing the pipe fittings found on the oil 

cooler and the authorized pipe sealant to be used. 

2. Appendix B provides the "General Torque Specifications" to be used when tightening 

the pipe fittings and B-nuts. 

CAUTION: It is critical to follow Standard Practices to prevent 

applying twisting or shear loads, or over torquing the mated fittings. 

3. Appendix C provides specific instructions to properly support equipment during 

installation of fittings and/or B-nuts (reference section C-12, "Hose and Tubing 

Installation." 

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©2015 Cont.nental Motors. Inc. 
Design enhancements: 

1. Eliminate the pipe bushing and nipple fitting stack-up (see Figure 1) typically found 

between the cross fitting and the oil cooler and replaces them with a single cross fitting 

(PIN 658607). 

2. Provide a larger tool surface area on the cross fitting for support wrenches during 

subsequent fitting and b-nut installation. 

3. Added AN915-1J, 45-degree elbow fitting, to specific TSI0550-C engine models to I 

accommodate optional oil pressure sensor installation (similar orientation as 

TSIOF550-D, see Figure 2). 

4. Remove the additional pipe bushings (PIN AS4861J01) used for the oil pressure sensor 

and pipe plug previously installed on TSI0550-C20B and -C21B installations (see 

Figure 1). These bushings are obsolete (for this application) and will no longer be 

necessary for the new cross fitting installation; the AN915-1J 45-degree elbow fitting or 

pipe plugs fit directly into the new cross fitting (see Figure 2). 

/Bushing, typ. 

~--~-~ Nipple, typ _ _/ ~ ... , 

Cross, lyp. t ~ 

TSI0550-C, AS ENUMERATED 

'\Bushing, typ. 

~-~J" Nipple, lyp~»-

Cross, typ. t ... ~ 

TSI0550-N 

~- ( . 

,.,_ k~~: 

~--1?-\hiog' 

t ... 

TSI0550-C20B 

TSIOF550-D 

TSI0550-C21 B 

TSIOF550-K 

Figure 1. Cross Fitting Stack-Up, Prior Configurations 

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2015/07/02 2015/11/09 2 of 6 CSB15-2 c P.O. Box 90 Mobile, AL 251-436-8299 
Elbow-,,,._ .. <® 

~ "-Plug 

~ 

Cross~-- Plug Fitting : ··@ 

~Flared Nipple 

TSI0550-C & N 

Elbow""""\ .W 

,-L~ensor 

eros~. Oil P~~~:· Filling : -~ 

~Flared Nipple 

TSIOF550-D 

Figure 2. Cross Fitting, NEW Configurations 

Ill. ACTION REQUIRED 

TSIOF550-K 

REMOVE AND REPLACE the superseded parts with new cross fitting (PIN 658607) using the 

same procedures located in your M -18 or M -26 Maintenance and Overhaul Manuals. Reference the 

latest revision of the CMI Illustrated Parts Catalog (IPC) to determine applicable additional 

connectors, elbows, or plug part numbers and adjust the instmctions accordingly. 

OLD FITTING 

AN918-1J, AN91S-ZJ 

NEW FITTING 

658607 

Figure 3. Cross Fitting, Comparison 

WARNING 

Use eye protection when cutting safety wire to prevent eye 

injury. 

1. Remove and discard safety wire securing vernatherm to oil cooler pipe bushing. 

2. Follow the detailed instructions for removing and installing pipe fittings found on oil 

coolers (Chapter 17-6) using sealant specified. 

3. Use a minimum lOX magnifying lens to visually inspect outboard port threads at the aft 

side of the oil cooler for contamination, distortion, or damage before installing new 

cross fitting (PIN 658607). 

a. If detennined serviceable, continue installing new cross fitting. 

b. If there is evidence of contamination or damage, please contact Continental Motors 

Customer Service Department directly at I (800) 326-0089. 

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P.O. Box 90 Mobile, AL 251-436-8299 3 of6 CSB15-2 c 
4. Reference Appendix B, "General Torque Specifications" for torque ptpe fitting 

installation instructions (NPTF threads): 

a. Screw the cross fitting (PIN 658607) into the outboard port (at the aft side of the oil 

cooler) to the finger tight position. 

b. Wrench tighten the cross fitting to the appropriate clocking of fitting within 1~3 

turns from the finger tight position. Minimum torque of 185 in/lbs must be achieved 

upon clocking position of fitting. 

NOTE: The fitting is not to be loosened in order to achieve proper alignment 

(clocking). Torque values specified are for reference only. Torque values must 

be used on other pipe fittings or plugs where clocking is not required. 

5. Reference Appendix C, "Hose and Tubing Installation" when installing fittings and/or 

B-nuts. 

CAUTION: It is critical to supportpipe.fittings and follow Standard 

Practices to prevent applying twisting or shear loads, or over 

torquing the matedfittings. 

a. Use a wrench on both mating connections to avoid applying excessive torque to the 

fittings. Securely tighten fittings and torque to the specified value in Appendix B. 

Torque the hose or tubing end fitting while maintaining sufficient force on adjacent 

fittings to prevent twisting and shear loads. 

CAUTION: Do not exceed specified torque values. 

b. Support the last fitting in the assembly on components that contain multiple fittings 

coupled in one location (see Figure 4). DO NOT over-torque fittings. 

Fitting to be 

"'Clocked" 

Support Fitting with 

Open End Wrench 

Figure 4. Hose and Tube Installation Support 

6. Install new safety wire securing vernatherm to cross fitting. Reference Appendix C-4, 

"Safety Wire Hardware" to properly secure hardware. 
7. Conduct a normal engine start and ground run-up according to your Airplane Flight 

Manual/ Pilot's Operating Handbook (AFMIPOH) provided by the airframe manufacturer. 

8. Perfonn a visual leak check of the serviced area, after shut-down, prior to placing 

aircraft in service. 

9. Make appropriate logbook entries detailing compliance actions taken in accordance 

with this Critical Service Bulletin (CSB15-2). The logbook entry must include a 

complete listing of parts used in this installation. 

lO.Retum aircraft to service. 

IV. WARRANTY 

This Critical Service Bulletin is your authorization to perform the required inspection, replace the 

affected part(s), and receive warranty reimbursement, limited to the "Models Affected" and 

compliance action required as defined within. Contact your authorized Continental Motors 

distributor for warranty claim application and parts return instructions. 

Contact Continental Motors Technical Services at one of the numbers listed below if you have 

any questions concerning the technical content of this Critical Service Bulletin. 

1.888.826.5465 

+ 1.251.436.8299 

+ 1.305.964.0872 

toll free in United States 

international callers 

en Espafiol 

NOTE: Visit the Continental Motors 

www.contincntalmo1ors.acro to obtain copies 

Motors Warranty Policies. 

A. Allowances/Reimbursements 

web site at 

of Continental 

Table 1 Labor allowance shall be· 

Scope of Work 

Remove and replace superseded parts. 

B. Illustrated Parts Catalog Instructions 

Labor 

Allowance 

(hr) 

1.0 

Replacement parts required to comply with this bulletin are published in the illustrated 

parts catalogs on the Continental Motors web site and may be ordered through any 

authorized Continental Motors distributor. 

NOTE: To find an authorized Continental Motors distributor, 

follow this linlc http://www.contincntalmotors.ncro/ 

Support __ Materials/Authorized Distributor Listing/ 

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