Lycoming MSB 393: Revision C, text

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TEXTRON Lycoming MANDATORY 652 Oliver Street SERVICE BULLETIN Williamsport, PA 17701 U.S.A.

717/323-6181 DATE: November 26, 1976 Service Bulletin No. 393B) 393C (Supersedes Service Bulletin No.

Engineering Aspects are FAA (DEER) Approved SUBJECT: Exhaust Slip Joint Modification MODELS AFFECTED: TIGO-541-E series engines with serial numbers 101-62 thru 698-62.

Remanufactured engines shipped before September 15, 1976.

NOTE Engines that were inspected and modified in accordance with any previous edition bulletin No. 393 require cable change as described in step 6.

TIME OF COMPLIANCE: next 100 hour engine inspection engines modified in accordance with Service Bulletin No. 378 in which case change is required in next 25 hours.

methods have been used to 3. Reassemble exhaust adapter pipes to of the exhaust pipe slip 2005 check coopling part number. MVT69163- transition assembly using new 78083 manifolds. Brieflytensioned the left and right Lycoming P/N LW-12093-5 1s the No. 368 describes a spring number of the correct coupling to be used.

capa U-bolt clamp in Service Bulletin No. Inspect coupling with the 3 v-band a depth micrometer as shown sections of each used. Earlier editions of 1n figure 2. Any dimension obtained under bulletin provided for a single then a • 230 inch renders the coupling unfit for assembly to replace the spring further service.

rods and U-bolts. Since then, sevof stretched cables have occurred indicating that the previous 1/16 inch FLANGE FACE and double cable assemblies used were insufficient secure the manifold; conse- CHECK ENTIRE CIRCUMFERENCE this edition provides a larger sin- OF THIS EDGE FOR CLEARANCE

WITH FACE OF FLANGE with the following instructions insofar applicable to the engine being

1. Remove spring tensioned rod and clamps OI u-bolt clamps as may be the case. These parts are not reused.

2. Inspect exhaust adapter

CHECK FOR DAMAGE which may prevent WHICH MIGHT PREVENT the adapter pipe inside th FREE MOVEMENT IN

SLIP JOINT must be .090 inch below surface of the flange face. Use a hand INSPECT THIS AREA ance. (Seet necessary to obtain this clear- CRACKS AROUND FLANGE FOR LW- 13027 or LW-10798 REAR EXHAUST ADAPTER Figure 1. Exhaust Adapter Pipe Showing Areas Requiring Inspection Page 1 of 3

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Service Bulletin No. 393C installing the couplings around sure the entire assembly is in alignment; that is, flanges must match each other. Supthe exhaust system in this position couplings around engage latch. Tighten coupling to 50 inch pounds initial torque. Tap erie tensioning with malet to

5. Check torque and continue tightening to final torque of 70/80 inch pounds, ping coupling until torque reading stabilizes.

NOTE INSIDE DÉPTH OF Do not exceed tightening torque specified for couplings, or open them CLAMPING AREA enough to damage the coupling wrap- Over torqueing spreads the v- MUST NOT BE LESS band section the coupling THAN .230 IN impairs its retaining qualities.

6. Assemble clamps LW-14504 Figure 2. Exhaust Manifold Coupling approximately Inspection Requirement joint and IW-14525 clamps on left and right exhaust pipes. Connect cable assemblies IW- clamps with attaching parts SID- STD-2178 washer NOTE nuts. Note that 4 of these new IW-15437 assemblies, are now 1/8 inch The exhaust adapter pipes attached to nos. 5 and cylinders, the transi- along with replace 8 of the previously used that were 1/16 the segments attached to inch diameter. The indicated quantities are tion assembly, are especially subject for 2 engines. Attach these cables, cracks the area of weldments enough slack to provide 1/4 inch deflection and attaching Ilanges. Replace any after assembly. (See figure that indicate such defects. 3.) Tighten nuts to 60 + 10 inch/1bs.

NOTE The following kit to perform this modification is supplied through Avco Lycoming Distributors. ordered February 1, Allowance for labor and furi part credit, F. O. B. Williamsport, Pa. will be accordance the following schedule. Furnish engine serial numbers to your Avco Lycoming Distributor for ordering parts and submission of a Warranty Application.

1. Engines in compliance with Service Bulletin No. 378 • •3 hours labor

2. Engines in compliance with Service Bulletin No. 368 • • • • 1 hour labor No allowance for labor is provided for engines that are in compliance with Service Bulletin No. 393 or 393A; however, no charge rechly Yeon voLe aming Service Department. IW-15437 w111 be Include engine serial numbers with your request for the cables.

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Service Bulletin No. 393C NOTE: CABLES ARE ATTACHED OUTSIDE OF THE CLAMP.

STD 2177 NOTE RIG CABLES (LW-14572) TO PROVIDE I/4 INCH DEFLECTION WHEN MEASURED LW-15437 MIDWAY BETWEEN CLAMPS - BOTH SIDES.

CABLES ARE ASSEMBLED ON THE OUT-

SIDE SURFACE OF THE CLAMPS AS SHOWN IN THE INSERT.

-STD-2178

- STD-2044 W-14525 LW-15437, 2 PLACES LW-14504 STD 2177 | 4 PLACES STD 2178 STD 2044) LW-14525 (2) Figure 3. Area of Transition Assembly Showing Cable Assembly PARTS DATA:

Kit No. IW-14608 Exhaust Manifold Retainer (for 2 engines) consists of:

Qty. Part No. Description 4 4 LW-14525 LW-14504 Clamp' ASSY: clamp, exhaust pipe, exhaust pipe, 2.00 in.

4 LW-15437 Cable 8 STD-2177 Bolt, 1/4-20 × 15/16 8 STD-2178 Washer 8 STD-2044 Gasket, v-band coupling self-locking 4 78083 * - Inside diameter of clamp is measured with .20 gap at opening.

NOTE: Revision "C" changes cable assembly and quantity required.

19025, 19025-A, 19434, 19591 - These numbers for Avco Lycoming reference only.

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