The engine crankcase consists of two parts, which are connected to each other by bolts in the plane of the crankshaft and camshaft.
The engine cylinders have the same shape, and if necessary, it is allowed to replace the cylinders separately complete with a piston. Each pair of cylinders has a common aluminum alloy head. Each cylinder has two valves placed vertically in the head. They can be replaced after removing the cylinder head. The left and right cylinder heads are completely symmetrical.
Since in boxer engines the cylinders are located on different sides, they start counting from the right side in the direction of backward movement. When in doubt, look for the cylinder number on the engine cover next to the spark plug holes.
The crankshaft is steel, forged, mounted on three main bearings. Fourth bearing (smaller diameter) mounted on the rear end of the shaft between the camshaft drive pulley and the V-belt pulley.
The camshaft is mounted in the crankcase under the crankshaft and rotates in three split steel bearings. It is driven by a pair of helical spur gears. To transfer movement from the cam to the valves, 8 pushers with rods and 8 rocker arms are used.
The lubrication system consists of a gear pump driven by a camshaft with a pressure reducing valve, an oil cooler and an oil pressure sensor.
The engine is cooled by a centrifugal fan, the impeller of which is mounted on the generator shaft. The air entering the engine through the cooling channels is carried out in two streams (left and right) around the ribs of the cylinders and then out. Below, under the 1st and 2nd cylinders in the air stream is a thermostat. It regulates the flow of air to the cylinders depending on its temperature. This ensures a quick warm-up of a cold engine.
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