ENGINE
The crankshaft is made of forged steel and the
journals, the crankpins and the bearing surface for
the oil seal are induction-hardened to increase wear
resistance. Each crankshaft journal is supported by
the main bearing case (3) having a bearing inside.
The front bearing-crankshaft bearing (1) is a solid
type bushing and rear and intermediate bearings
are a split type. The crankshaft, crankshaft bearings
have oil holes for lubricant flow.
The piston is made of an aluminum alloy which is
temperature and pressure resistant. Three rings
installed in grooves in the piston. The top ring (1) is
a keystone type, which can withstand heavy loads,
and the barrel face on the ring fits well to the cylinder
wall. The second ring (2) is an undercut type, which
prevents the oil from being carried up. The oil ring
(3) has chambered contact faces and an expander
ring, which increase the pressure of the oil ring
aginst the cylinder wall to scrape the oil. The top ring
is plated with hard chrome to increase wear
resistance(The ring of 4A200T engine is special
s t e e l ) .
The connecting rod (2), which converts the
reciprocating motion of the pistons caused by the
fuel combustion into the rotating motion of the
crankshaft, is made of hard forged steel. The
connecting rod has bearings at both ends. The
small end has a solid type bearing(small end
bushing (2)) and the big end has a split type
bearing(crankpin bearing (3)).
(1) Small End Bushing
(2) Connecting Rod
(3) Crankpin Bearing
C. CRANKSHAFT
D. PISTON AND PISTON RINGS
E. CONNECTING ROD
(1) Top ring (2) Second ring (3) Oil Ring
