Connecting the oil pipe, water pipe, the water pipe on the water tank is connected to the engine outlet pipe, the water tank inlet pipe is connected with the water pump outlet pipe. (oil cooler, the oil cooler outlet pipe is connected with the oil filter, the oil cooler inlet pipe is connected with the oil pipe on the fuselage) It is required to connect the waterways. The connection part of the oil circuit must be firm and tight, and there must be no water leakage or oil leakage.