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4-2 ENGINE
4-2-l CYLINDER AND CRANKCASE
The cylinder and the crankcase of the engine are of a one-piece aluminum die-cast design. The
specific iron cylinder is cast-fitted inside the cylinder.
Both the intake and exhaust ports are
positioned at the lateral side of the cylinder.
These ports are also cast
by
using a mould with
die-cast cores. The crankcase has its joint face located on the generator side, and it is of an
assembly structure.
4-2-2 MAIN BEARING COVER
The main bearing cover is alminum die-cast and is mounted on the generator side. By removing
it, the interior of the engine can be inspected.
4-2-3 CRANKSHAFT
The crankshaft is constructed of forged carbon steel, and the crankpin is induction-hardened. A
crank gear is pressure-fitted on the generator side of the engine.
4-2-4
CONNECTING ROD AND PISTON
The connecting rod is made of forged aluminum alloy with both the major and minor ends utilized
as bearings. An oil scraper is cast on the major end. The aluminum alloy casting piston has slots
on which two compression rings and one oil ring can be assembled.
4-2-5 CAMSHAFT
The camshaft is made of special cast iron and has intake and exhaust valve drive cams, each of
which engages with the camgear. An exclusive aluminum alloy is used on each end of the
camshaft in the place of bearings. (Ball bearings are not used.)
4-Z-6 VALVE ARRANGEMENT
The intake valve is arranged in the generator side, while the exhaust valve is arranged in the
recoil side.
4-2-7 CYLINDER HEAD
The cylinder head is die-cast aluminum and has a Ricardo type combustion chamber featuring
greater volume capacity for improved combustion efficiency. For easier ignition plug mainte-
nance the cylinder head is positioned vertically.
4-2-8 GOVERNOR
The centrifugal weight governor ensures constant engine speed, regardless of load fluctuations
(the governor is mechanically linked to the governor drive gear).
4-2-9 COOLING SYSTEM
The cooling system with a cooling fan, which also functions as a flywheel, compulsorily sends
cooling air to the cylinder and the cylinder head and cools them.
This forced air cooling system
has a baffle plate and a head cover.
4-Z-10
LUBRICATION SYSTEM
The moving and sliding parts inside the engine are lubricated with
the
oil scraper fitted on the
connecting rod by scraping and splashing oil in the crankcase.
-9-