Patent ID: 7600491

Claim:
A coolant air bleed structure for a water-cooled in-line type internal combustion engine, the water-cooled internal combustion engine comprising a cylinder; a cylinder head disposed at an upper portion of said cylinder; an intake port operatively associated with said cylinder; and a water jacket formed within at least the cylinder head; and said coolant air bleed structure comprising: an air bleed member disposed at a substantially vertical central portion of the cylinder head; said air bleed member comprising a jiggle valve for discharging air from the water jacket; wherein said vertical central portion is situated on a sidewall of the cylinder head; and wherein said water jacket includes a coolant outlet port formed in the cylinder head, said coolant outlet port opens below the intake port at a left side of the cylinder head; wherein said air bleed structure is fluidly connected with an upstream side tank of a radiator via an air bleed tube; wherein said air bleed structure is configured such that during a coolant changing operation, said jiggle valve of the air bleed member is automatically operated to be in an open position to release air from the water jacket; wherein said substantially vertical central portion includes a protrusion formed thereon, said protrusion having an air bleed hole formed therein; and wherein said air bleed hole is adapted to receive the air bleed member therein.