6. CYLINDER HEAD/VALVES K-XCT 125i Valve Spring Compressor DISASSEMBLY Remove the valve spring cotters, retainers, springs, spring seats, oil seals and valves using a valve spring compressor. Be sure to compress the valve springs with a valve spring compressor. Mark all disassembled parts to ensure correct reassembly. Special tool: Valve Spring Compressor A120E00040 Valves 6-11