AD 72-24-03

72-24-03 TELEDYNE CONTINENTAL: Amendment 39-1554. Applies to Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J engines having Teledyne Continental Part Number 631645 oil filter adapter installed, used with AC OF-9-A oil filter assembly. Compliance required as indicated, unless already accomplished. To prevent loss of oil accomplish the following or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, Southern Region, Atlanta, Georgia: (A) Not later than next engine overhaul, replace Teledyne Continental Part Number 631645 oil filter adapter with strengthened Teledyne Continental Part Number 632881 (Kit Part Number 637584A1) in accordance with Teledyne Continental Service Bulletin M70-16 or AC Part Number 5579663 (Package No. 6437861) in accordance with AC instruction sheet 6439067. NOTE: The correct AC part may be identified by a cast-in insignia "A" (raised letter A with a raised bar over the letter A). All other AC adapters areineligible, including those identified by a plain raised letter "A" and a raised letter "A" and a raised dot (A) directly above. The Teledyne Continental adapter is identified by part number only. (B) Within 25 hours' time in service from the effective date of the amendment, unless already accomplished under AD 71-11-04, paragraph (B) inspect the base plate to determine whether the gasket retaining seat is wedge-shaped or rectangular. If the gasket seat is wedge-shaped, replace this part with improved Teledyne Continental Part Number 633750 or AC Part Number 6437508 (Package No. 6436627) base plate having a rectangular shaped gasket retaining seat. NOTE: The required base plate can be identified by the presence of a thin sheet metal square shouldered retaining ring spot welded around the gasket groove to hold the gasket in place. (C) Unless already accomplished within the last 50 hours' of service prior to date of this amendment, accomplish the following within the next 25hours' time in service and at every oil filter element change thereafter: (1) Visually inspect the upper surface of the oil filter adapter face using a light and mirror for indications of radial cracks inward from the outer edge. Replace any cracked adapters with serviceable parts prescribed in paragraph (A). (2) After placing filter element in housing in accordance with oil filter element manufacturers' instructions, install assembled housing and base plate to adapter as follows: a. Clean all gasket and seal surfaces. b. Lubricate new gasket well on both sides using engine oil. c. Install assembly on adapter and turn center stud to a light seal contact by hand. d. Visually inspect base plate to adapter seal for proper positioning and seating. e. Torque center studs to 15 - 18 lb. ft. If torque wrench is not available or center stud is inaccessible to torque wrench, tighten center stud 1 3/4 turns beyond point of initial seal contact. f. Re-attach upper bracket and resafety. g. Operate engine for approximately 5 minutes at 1000-2000 RPM. Check for oil leaks and proper assembly using a light and mirror if necessary. If a leak appears between top of housing and stud, remove stud and check for nicks or visual damage at sealing surface. Correct any damage and re-install using a new copper gasket. DO NOT INCREASE TORQUE TO STOP LEAKS. Continental Service Bulletin M66-6, dated April 28, 1966, refers to this subject. (D) The requirements of Paragraph (C) are no longer applicable when Paragraph (A) has been complied with. This airworthiness directive supersedes Amendment 39-1215, (36 F.R. 9241, 9242), A.D. 71-11-04, as amended by Amendments 39-1256, (39 F.R. 14127) and 39-1289, (39 F.R. 18373). This amendment becomes effective November 15, 1972.