Oh. On an M117, I haven't found a tool that will allow me to replace the valve seals with the head attached. Is there a special tool to do what you described on a M103 or will a generic American V8 in situ compressor work? I've never looked under my M103 valve cover. This is more out of curiosity since I suspect my head gasket is leaking

Thanks,
Sixto
78 450SEL
91 300SE