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PO Box 90 Mobile Alabama 36601. Member of GAMA. General Aviation. Manufacturer's Association service bulletin. November 30, 1981. TO:.
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CONTINENTAL AIRCRAFT ENGINE

service bulletin

M81-25 Technical Portions are FAA-DER Approved

November 30, 1981 TO:

Aircraft Manufacturers, Distributors, Dealers, Engine Overhaul Facilities, Owners and Operators of Teledyne Continental Motors’ Aircraft Engines.

SUBJECT:

EXHAUST FLANGE TO CYLINDER INSTALLATION PROCEDURES

MODELS AFFECTED:

All

Gentlemen: Successful performance and service of an aircraft engine exhaust system is dependent on secure fastening and sealing of the exhaust flange at the engine cylinder exhaust port. These are recommended procedures to be followed when an exhaust flange is installed on a cylinder: 1)

Before assembling the exhaust system to the cylinders, inspect the cylinders, exhaust flanges and exhaust studs for damage and cleanliness. (See applicable manufacturer's publications.)

2)

Install gaskets and properly position the exhaust system on the cylinders. Insure that the exhaust flanges are all firmly seated to the cylinders. In several steps evenly tighten all exhaust nuts to the specified torque value.

3)

After ground run-up to normal operating temperature for inspection purposes and prior to return to flight service, re-torque all exhaust nuts to the specified torque values.

 TELEDYNE INDUSTRIES, INC. 1981

TELEDYNE CONTINENTAL MOTORS

Member of GAMA

Aircraft Products Division

General Aviation Manufacturer’s Association

PO Box 90 Mobile Alabama 36601

30 November, 1981

M81-25

Page 2

Listed below are the exhaust gaskets and nuts recommended for use on TCM engines. Also listed are the specified torque values for the nuts. ENGINE

GASKET

NUT

TORQUE

A65 C75 C85 C90 O200 C125 C145 O300 GO300 E165 E185 E225 O470A O470E O470J IO470J IO470K

627429 Spiral Wound or 632837 Stainless Steel

22022

IO360 TSIO360 LTSIO360

630365 Stainless Steel 22022 200-210 in. lb. 16.7-17.5 ft. lb. (Use two each gaskets per cylinder - flat sides together)

200-210 in. lb. 16.7-17.5 ft. lb.

O470-letter 628260 Spiral Wound or IO470 631544 Stainless Steel IO520 (Except those listed above)

643967

100-110 in. lb

8.3-9.2 ft. lb

TSIO470 TSIO520 LTSIO520 GTSIO520

643967

100-110 in. lb.

8.3-9.2 ft. lb.

628260 Spiral Wound