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964 Cylinder TSB PDF

The technical bulletin outlines procedures for refacing cylinder heads on Porsche 911 Carrera 2/4 models from 1989 to 1991 using Tool 9526. It addresses oil leakage between the cylinder and head sealing areas and requires all cylinders and pistons to be replaced while refacing sealing surfaces. The bulletin specifies using steel sealing ring Part No. 964 104 115 20 to ensure a proper seal. It includes precise machining instructions to maintain cylinder head integrity and prevent damage, ensuring optimal performance and reliability for the specified Porsche models.