Engine, outboard motor and boat

An engine, comprising:

• a crankcase housing a crankshaft extending in a vertical direction;
• a cylinder block mounted on a side of the crankcase and formed with a cylinder;
• a cylinder head mounted on a side of the cylinder block and provided with an air inlet port and an air outlet port communicating with the cylinder;
• a cylinder head cover mounted on a side of the cylinder head and covering the air inlet port and the air outlet port;
• a mount case including:
• a supporting portion provided below the crankcase and the cylinder block and supporting the crankcase and the cylinder block;
• and
• an extending portion extending from the supporting portion below the cylinder head and the cylinder head cover;
• an oil pan provided below the mount case and storing lubricating oil;
• and
• a communication tube communicating a first space formed between the cylinder head and the cylinder head cover and a second space formed between the mount case and the oil pan, wherein
• the communication tube is provided between the cylinder head cover and the extending portion, wherein
• the engine is a V-type multi-cylinder engine including a pair of banks, wherein
• the communication tube communicates the first space of each bank of the pair of banks and the second space respectively, wherein
• the pair of banks is a first bank and a second bank, wherein
• the communication tube of the first bank and the communication tube of the second bank are same in shape.