Mortise lock cylinder

Disclosed is a mortise lock cylinder with a single cylinder euro profile mortise lock for use where the axial space is limited, such as a thin door application. The mortise lock cylinder (20) includes a turn-piece assembly (26) including a turn-piece in driving engagement with a first clutch (56) and a keyed cylinder assembly (28) with a second clutch (104). A first portion of the turn-piece assembly (26) is received in the first end of a housing (30) and a second portion of the keyed cylinder assembly (28) is received in the second end of the housing (32). A cam (24) is positioned in the cam slot (38) and mounted for rotation. The mortise lock cylinder (20) is configured such that the cam (24) is always engaged with the first clutch. The second clutch is coupled to the cam via the first clutch only when the key (116) is inserted into the keyed cylinder assembly (28) and is otherwise biased away from the first clutch by spring (106).