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Service Manager / Service Technician This bulletin replaces Technical Bulletin Group 1, Number 9202, Book I, pages 13-16. 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. Due to higher operational temperatures of the Carrera 2/4 engines, some blackening (carbonizing) of oil at the lower sealing area is possible. If there is only a small discolored area on the bottom of the cylinder head without wetness, this can be considered normal and no repairs are necessary. 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. This information also applies to engines produced after the above mentioned engine numbers. The above subject repair will require PRIOR District Service Manager authorization until further notice (this includes dealers on the self-authorization program). All subsequent repairs needing to be done, in addition to the cylinder head re-machining, piston and cylinder replacement, exceeding $100 will also require a PRIOR District Service Manager authorization.
Tags : porsche 911 carrera, porsche 911, cylinder replacement, oil leakage, authorization program, engine numbers, surface figure, cylinder head, wetness, service technician, further notice, piston, figure 1, groove, porsche
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