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AAAA Validity : S / N 1 - 9999 74-20-02Page 301 (BA) OCT 02 PAGE INTENTIONALLY LEFT BLANK AAAA Validity : S / N 1 - 9999 74 20-02Page 302 (BA) OCT 02 SPARK PLUG REMOVAL / INSTALLATION 1. REMOVAL OF A SPARK PLUG (Figure 401) A. Tools and consumable materials - Blanking caps - Hexagon spark plug wrench B. Procedure WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE ENGINE, EXHAUST PIPE AND MANIFOLDS ARE COLD. IF NOT, TAKE NECESSARY PRECAUTIONS TO AVOID SEVERE BURNS. WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE KEY IS REMOVED FROM MAGNETO SELECTOR AND THAT "MAIN SWITCH" IS OFF. IF AIRCRAFT IS EQUIPPED WITH DISCONNECT PLUG ON FIREWALL, DISCONNECT "MAGNETO DISCONNECT" PLUG AND CONNECT IT TO "GROUND MAGNETO FOR SERVICING" PLUG. 1) Remove the engine cowlings - refer to 71-10-01. 2) Disconnect the ignition harness - refer to 74-20-01. 3) Remove spark plug (1) using a hexagon spark plug wrench. NOTE : When removing several spark plugs, mark their positions (top spark plug, bottom spark plug and cylinder number). 4) Discard gasket (2). 5) Blank off the cylinder. 2. INSTALLATION OF A SPARK PLUG (Figure 401) A. Tools and consumable materials - Hexagon spark plug wrench - Torque wrench 0 to 885 lbf.in (0 to 100 N.m) - Grease (TB 04-003) - Fine brush - Setting tool Champion 2500A or CT-415 AV or equivalent B. Procedure WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE ENGINE, EXHAUST PIPE AND MANIFOLDS ARE COLD. IF NOT, TAKE NECESSARY PRECAUTIONS TO AVOID SEVERE BURNS. WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE KEY IS REMOVED FROM MAGNETO SELECTOR AND THAT "MAIN SWITCH" IS OFF. IF AIRCRAFT IS EQUIPPED WITH DISCONNECT PLUG ON FIREWALL, DISCONNECT "MAGNETO DISCONNECT" PLUG AND CONNECT IT TO "GROUND MAGNETO FOR SERVICING" PLUG. ABAA Validity : S / N 1 - 9999 74-20-02 Page 401 74 (CA) OCT 02 1) Inspect the spark plug - refer to Page 601. 2) Adjust the gap between the electrodes of spark plug (1) using the setting tool : 0.016 in (0.41 mm) < Gap < 0.022 in (0.53 mm). 3) Install a new gasket (2). CAUTION : DO NOT APPLY GREASE ON THE SPARK PLUG ELECTRODES. 4) Using a fine brush, moderately coat thread (3) with grease (TB 04-003). 5) Remove the blanking cap. 6) Install spark plug (1). Torque - refer to 20-00-01. NOTE : When installing both spark plugs of a cylinder, permute the spark plugs. 7) Connect the ignition harness - refer to 74-20-01. 8) Make sure all the tools and materials are removed and the work area is clean and free from debris. 9) Install the engine cowlings - refer to 71-10-01. 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 74 点火 TB20飞机维护手册(9) |
