P 7 / 45
4. GENERAL DESCRIPTION OF ENGINE COMPONENTS
4 - 1 Cylinder and Crankcase
The cylinder and crankcase are aluminum
die castings split in upper and lower parts.
The cylinder block and the cylinder head
are a single piece. The valve seats are therein
and the valve guides (intake valves and exhaust
valves) as well as the valve stem seals (intake
side only) are pressure-fit. Moreover, the cylinder
bore is finished with hard chromium planting.
The crankshaft is made of malleable cast iron,
and the entire crank pin surface is hardened by
cementation.
The crank gear is pressure-fit at the side opposite
to the output end.
The connecting rod is a carbon steel casting, and
needle roller bearings are pressure-fit at the large
and small ends.
The piston is made of high silicon steel, and
measures are taken to improve its wearing
resistance.
4 - 2 Crankshaft and Connecting Rod
4 - 3 Piston
Crankshaft
Connecting Rod
Piston
Fig. 4-1
Fig. 4-2
Fig. 4-3
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