Adjustable camshaft sprocket assembly and tool for same

An adjustable camshaft sprocket assembly comprising:

• a sprocket body adapted to be mounted to an associated camshaft;
• a mounting plate adapted to be non-rotatably mounted on the associated camshaft and abutted with the sprocket;
• at least one fastener that is selectively threadably advanced into a mating bore of the associated camshaft from a loosened position to a tightened position, wherein:
• (i) said at least one fastener clamps said mounting plate and sprocket body to the associated camshaft when in said tightened position to prevent rotation of said sprocket body relative to the associated camshaft;
• and, (ii) an angular position of said mounting plate relative to said sprocket body is adjustable when said at least one fastener is in said loosened position;
• an adjustment tool opening defined in the mounting plate;
• a stud-receiving bore defined in the sprocket body and accessible through the adjustment tool opening;
• wherein said adjustment tool opening is adapted to receive a body of an associated adjustment tool and the stud-receiving bore is adapted to receive a projecting eccentric stud of the associated adjustment tool, such that rotation of the associated adjustment tool in the adjustment tool opening causes relative angular movement between said mounting plate and said sprocket body when said at least one fastener is in said loosened position.