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1989 Porsche 911 Carrera 4 Coupe AWD F6-3600cc 3.6L SOHC. Technical Service Bulletin. Cylinder Heads - Refacing Information, Concern: Oil leakage between cylinder and cylinder head. Oil “leakage” in the case of 911 Carrera 2/4 engines means oil leaking (drops forming) from the cylinder to cylinder head mating area, resulting in oil wetness on the lower area of the cylinder head or on the exhaust heat exchangers. When repairing oil leaks from the cylinder to cylinder head sealing area on engines prior to the above engine numbers, all cylinders and pistons should be replaced and all cylinder head sealing surfaces refaced. Cylinder head nuts are reusable. Importance notice : Replacement piston and cylinder sets have a groove to accommodate a seal between the cylinder head and cylinder mating surface (Figure 1). Effective immediately, only the steel sealing ring, Part Number 964 104 115 20 is to be used during repairs. The cylinder heads must be refaced to accommodate the dimension of the new cylinders. Refacing can be done without cylinder head disassembly. Refacing of the sealing surface requires a lathe and use of special tool 9526. Machine 0.10 +/- .02 mm from inner surface (arrow 2 in Figure 4). The diameter of the machined surface must be 145 mm (Figure 4). A surface quality standard of 32 micro-inches must be maintained. Machining should be done with a cutting tool at right angle to the work. The cylinder head surface may only be machined a maximum of 0.20 mm.
Tags : porsche 911 carrera 4, porsche 911 carrera, porsche 911, oil leaks, head gasket, head surface, oil leakage, machined surface, engine numbers, surface figure, cylinder head, surface quality, inner surface, cutting tool, quality standard
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