Bock FK40 FK50 AC compressor shaft seal replacement (FKX40, FKX50) 

How to replace the shaft seal on Bock FK compressor.
This compressor is mainly used on bus and coach AC units (the K version) and is adopted by almost all manufacturers like Spheros, Ebrspaecher Sutrak, Konvekta, Webasto, etc.
The construction of the compressors are the same only the nameplate on cylinderheads will be differrent. The Shaft seal is pretty much the same for all models and capacities.
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