In the large rear, almost semicircular, standing and black box the radial blower for air cooling is housed. The crankshaft in the middle below drives the DC generator on the top right via a V-belt. In the black box is the impeller mounted on the same shaft. So, at the V-belt are involved power supply and cooling. To the left of the generator the single carburettor, sitting on the air filter.
The two horizontal lying cylinder of the boxer engine left and right are supplied from the carburettor via a suction tube that once divided oneself below the carburettor and then respectively still around halfway to the dual channel cylinder heads.in this model. Snapping off forward we see the preheat tube fed from the exhaust system.
Below the carburettor, the mechanically operating petrol pump. To the left of the carburettor and fuel pump is to see almost the entire ignition with ignition coil top and bottom the distributor, from which the ignition cables run to the individual cylinders.
The upper part of the engine is separated from the lower by a sheet of several parts. Below the sheet metal the left valve cover can be seen. If you remove it, you reach the OHV valvetrain. Here the valve clearance is then adjusted on each side. The gray heat element below the black valve cover. Together with the on the other side, the heat if necessary with the exhaust gas from the front cylinder air, coming through the two light brown tubes above of the sheet from the blower.
Picture 1 shows one of the two cylinder heads. Clearly visible the channel to the two cylinders. In previous years of construction, was there at this place another one the divided oneself not until in the cylinder head. Right the flange from the outlet port of the rear cylinder. Below the valve cover is removed. Likewise are removed push rods and the shaft with the rocker arms. We only see a small piece of the valve springs. Picture 2 shows the cylinder head with removed valves from the combustion chamber side. At the openings below the protective tubes are attached for the pushrods coming from the central camshaft.
This is a crankcase in unprocessed state. Picture 1 shows the opposite side for the protective tubes and the pushrods. Behind it the rotating camshaft that drives the pushrods via bucket tappets. About that, the crankshaft is built in. In the two large boreholes stuck the cylinders of a side whose pistons are connected by conrods with this crankshaft. The stud bolts for attachement of these cylinders with the help of the cylinder head still be lacking here. Picture 2 shows the front of the housing with the opening for the crankshaft to the first-mentioned V-belt pulley and below of the oil pump at the end of the camshaft. 12/15
Would you have thought that two persons can remove this engine in good 5 minutes? Granted, it was a bet and the procedure was fairly rough, because the metal sheets to cover the engine down were not, of course, as usual, beforehand specially dismantled. And the bet was lost with about 5 minutes.