Our universal valve spring tool set helps you to replace valve spring and oil seal of valve rod on car without removing head gasket. It is suitable for assembly and disassembly of valve springs and replacement of valve stem seals, without removing the cylinder head. The tool set runs well in the narrow engine room. Valves are closed by pressurized air, and can not fall into the combustion chamber. Special design helps to compress valve spring regardless of firewall barrier. It can be applied on most cars such as BMW, Volvo, Toyota, VAG, Ford, etc. Especially suitable for;Mercedes Benz engines: M102, M103, M104, M111, M112, M113, M271, M272 and BMW engines: N42, N52, N62, M52, M54, M56, M60.