## 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 ofengine 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**~**

## ===============o~r=A=N~9=1~8-=2=J=w='=.tl=r=e=ng~i=n=e~s=er=ia=l=n=u=m=b=e=rn~p=ri=o=r=to==l=O=l2=2=9=6=.===============**~** l. GENERAL INFORMATION

### ~ Continental Motors, Inc. (CMI) is aware ofsome occurrences where a loss ofengine 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 higherwere accomplishedat 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 orshear 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."

# ~**~ ~** **~**

# ~**~ ~** **~**

# ~**~ ~** **ii~~;;!;L ~iE~i~I** **T""i RRi** 

# 0EE1

# ~{i;~s**eEi ~D"** **T:";:-":·"""** 

# ....**~it~~~~** 

# ••**~;,':~-~~}=.·•·"""···••"""····"""•:.** ·"""·liPp;t>.;:; 1 G:ii

0 

### eE" 1

# N"NooTii~o~**:Cc "'t:;(~)l"R"REEvVi~iSs:iCJo>rN~~**  P.O. Box 90 Mobile, AL 251-436-8299 \. "'\, ©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

ISSUED REVISED

## ,,--:;;~:;;~~:::~~~-{~::**~::=_** - ----, PAGE NO DOC NO REVISION

__7 2015/07/02 2015/11/09 2 of 6 CSB15-2 

# c P.O. Box 90 Mobile, AL 251-436-8299Elbow-,,,._

..<®**~** "-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 orM-26 Maintenance and Overhaul Manuals. Reference the latest revision ofthe CMI Illustrated Parts Catalog (IPC) to determine applicable additional connectors, elbows, orplug 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 outboardport threads at the aft side ofthe oil cooler for contamination, distortion, or damage before installing new cross fitting (PIN 658607).

a. Ifdetennined serviceable, continue installing new cross fitting. b. Ifthere is evidence ofcontamination or damage, please contact Continental Motors Customer Service Department directly at I(800) 326-0089.

PAGE NO DOC NO REVISION

P.O. Box 90 Mobile, AL 251-436-8299 3 of6 CSB15-2 

# c4. 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 ofthe 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 offitting.

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 otherpipe 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 exceedspecifiedtorque 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 ofparts 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 ofthe numbers listed below ifyou have any questions concerning the technical content ofthis 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 ofWork 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/

PAGE NO DOC NO

P.O. Box 90 Mobile, AL 251-436-8299 5 of6 CSB15-2 REVISION 

# cIntentionally Lt:;{tBlank

ISSUED 2015/11/09 6 of 6 CSB15-2 

# c REVISED

### v:-~.::**:_·:~**__

### :~{~}~~-,~_:;:·:~.:-_co;

# ___-, P.O. Box 90 Mobile, AL 251-436-8299 PAGE NO DOC NO REVISION 2015/07/02