A system comprising: a cylinder block (100, 200) of a multi-cylinder engine; and a lance nozzle (30,60) configured to inject fluid, the lance nozzle including: a shaft body (33,64) internally includes a flow path (34, 68) of the fluid; a first nozzle hole disposed on a leading end side of the shaft body, the first nozzle hole configured to generate a first jet in a first injecting direction, the first injecting direction being a direction inclining to a base end side of the shaft body (33,65) with respect to a direction perpendicular to an axial direction of the shaft body; and a second nozzle hole disposed on a base end side of the first nozzle hole in the shaft body (33,65), the second nozzle hole configured to generate a second jet in a second injecting direction, the second injecting direction being a direction inclining to a leading end side of the shaft body with respect to a direction perpendicular to an axial direction of the shaft body (33,65); characterized in that the lance nozzle (30, 60) is configured to remove excess sprayed coating on a crank chamber (107, 207) of the cylinder block (100, 200) of the multi-chamber engine, the cylinder block (100, 200) including a plurality of cylinder bores (104, 104a, 104b, 203, 204) and the crank chamber (107, 207) separated by a partition wall with a communication hole to form a plurality of small chambers (108, 208); the first nozzle hole has an inclination angle (θ1) formed by the first injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 1, and the second nozzle hole has an inclination angle (θ2) formed by the second injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 2: tan − 1 T 2 D ≤ θ 1 < 90 ° 0 < θ 2 ≤ tan − 1 T D where D: representative length of the communication hole; and T: representative thickness of the partition wall. a cylinder block (100, 200) of a multi-cylinder engine; and a lance nozzle (30,60) configured to inject fluid, the lance nozzle including: a shaft body (33,64) internally includes a flow path (34, 68) of the fluid; a first nozzle hole disposed on a leading end side of the shaft body, the first nozzle hole configured to generate a first jet in a first injecting direction, the first injecting direction being a direction inclining to a base end side of the shaft body (33,65) with respect to a direction perpendicular to an axial direction of the shaft body; and a second nozzle hole disposed on a base end side of the first nozzle hole in the shaft body (33,65), the second nozzle hole configured to generate a second jet in a second injecting direction, the second injecting direction being a direction inclining to a leading end side of the shaft body with respect to a direction perpendicular to an axial direction of the shaft body (33,65); characterized in that the lance nozzle (30, 60) is configured to remove excess sprayed coating on a crank chamber (107, 207) of the cylinder block (100, 200) of the multi-chamber engine, the cylinder block (100, 200) including a plurality of cylinder bores (104, 104a, 104b, 203, 204) and the crank chamber (107, 207) separated by a partition wall with a communication hole to form a plurality of small chambers (108, 208); the first nozzle hole has an inclination angle (θ1) formed by the first injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 1, and the second nozzle hole has an inclination angle (θ2) formed by the second injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 2: tan − 1 T 2 D ≤ θ 1 < 90 ° 0 < θ 2 ≤ tan − 1 T D where D: representative length of the communication hole; and T: representative thickness of the partition wall. a shaft body (33,64) internally includes a flow path (34, 68) of the fluid; a first nozzle hole disposed on a leading end side of the shaft body, the first nozzle hole configured to generate a first jet in a first injecting direction, the first injecting direction being a direction inclining to a base end side of the shaft body (33,65) with respect to a direction perpendicular to an axial direction of the shaft body; and a second nozzle hole disposed on a base end side of the first nozzle hole in the shaft body (33,65), the second nozzle hole configured to generate a second jet in a second injecting direction, the second injecting direction being a direction inclining to a leading end side of the shaft body with respect to a direction perpendicular to an axial direction of the shaft body (33,65); characterized in that the lance nozzle (30, 60) is configured to remove excess sprayed coating on a crank chamber (107, 207) of the cylinder block (100, 200) of the multi-chamber engine, the cylinder block (100, 200) including a plurality of cylinder bores (104, 104a, 104b, 203, 204) and the crank chamber (107, 207) separated by a partition wall with a communication hole to form a plurality of small chambers (108, 208); the first nozzle hole has an inclination angle (θ1) formed by the first injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 1, and the second nozzle hole has an inclination angle (θ2) formed by the second injection direction and the axial direction of the shaft body (33, 65) satisfying a following formula 2: tan − 1 T 2 D ≤ θ 1 < 90 ° 0 < θ 2 ≤ tan − 1 T D where D: representative length of the communication hole; and T: representative thickness of the partition wall. D: representative length of the communication hole; and T: representative thickness of the partition wall.