c SABl~l~Y7 A §: 

SUPERSEDES CSBIS-7 ~ ;~~-'1N~:~~~l~-~~N~ ~ 

CRITICAL SERVICE BULLETIN 

CONTINENTAL MOTORS® AIRCRAFT ENGINE 

COMPLIANCE NECESSARY TO MAINTAIN SAPETY 

SUBJECT: 

PURPOSE: 

TSI0550-K Oil Cooler Cross Fitting Replacement ~ 

To replace oil cooler cross fitting (part number AN9l8-ll) with a new ~ enhanced cross fitting (PIN 658607). ~~ 

COMPLIANCE: Prior to further flight. A maximum of 5 hours flight time is authorized for ~ aircraft repositioning in order to comply with this bulletin. ~ 

MODELS I AFFECTED: New and rebuilt TSI0550-K aviation gasoline (AvGas) engine models using oil ~ cooler cross fitting PIN AN918-1J with engine serial numbers prior to 1012296. ~ 

I. GENERAL INFORMATION ~ Continental Motors, Inc. (CMI) published CSB15-2 upon discovering isolated occurrences in ~ which there was a loss of engine oil due to a fractured nipple fitting between the cross fitting and '-"' 

the pipe bushing at the oil cooler. Design improvements consolidate the oil cooler cross fitting '-." 

stack-up into a single part, significantly increasing the strength and providing a simplified '\.." 

procedure for installing the oil cooler cross fitting found on specified TSI0550 engines. If~ 

CSB15-2 was previously complied with on the TS/0550-K engine, no further action is ~ 

required. 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 '-"-

~- ~ II. 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 20 15), or later revision, Maintenance and Overhaul Manual: ~ 

1. Chapter 17 provides detailed instructions 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 ~ 

tlw p~::~~~ :di:::;::~al 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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P.O. Box 90 Mobile, AL 251-436-8299 

©2015 Continental 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 'Nfenches during 

Subsequent fitting and B-nut installation. I 

\.Bushing, typ. 

'@.~ Nipple, typ._/ 

Cross, typ. 

TSI0550-K 

Figure 1. Cross Fitting Stack-Up, Prior Configuration 

Elbow' .-~ 

~- '-Plug 

Cros~.. Plug 

Fitting : ··~ 

~ fiif.--_ Flared 

Nipple 

TSI0550-K 

Figure 2. Cross Fitting, NEW Configuration 

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2 of 6 CSB15-7 

REVISION 

A 
IIJ. ACTION REQUIRED 

REMOVE AND REPLACE the superseded parts with new cross fitting (PIN 658607) using the 

same procedures located in yam M-18 Maintenance and Overhaul Manual. Reference the latest 

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

elbows, or plug part numbers and adjust the instructions accordingly. 

OLD FITTING 

AN911MJ 

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 vematherm 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 1 OX 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 determined serviceable, continue installing new cross fitting. 

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

Customer Service Department directly at 1(800) 326-0089. 

4. Reference Appendix B, "General Torque Specifications" for torque pipe 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 

(clocldng). 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. 

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A P.O. Box 90 Mobile, Al251-436-8299 

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CAUTION: It is critical to support pipe fittings and follow Standard 

Practices to prevent applying twisting or shear loads, or over 

torquing the mated fittings. 

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 nonnal engine start and ground nm-up according to your Airplane Flight 

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

8. Perform 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 (CSB15-7). The logbook entry must include a 

complete listing of parts used in this installation. 

10. Return aircraft to service. 

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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 web site at 

\VW\v.continentalmotors.aero to obtain copies of Continental 

Motors Warranty Policies. 

A. Allowances/Reimbursements 

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 hUp:l/www.continentalmotors.acro/ 

Support Materials/Authorized Distributor Listing/ 

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P.O. Box 90 Mobile, AL 251-436-8299