Cub Cadet 8454 - Manual (Page 30)

CHAPTER 2 8454
2-8 D569-W02 May-2003
569W211A
569W210A
569W209A
(1) Top Ring (3) Oil Ring
(2) Second Ring
(1) Small End Bushing (3) Crankpin Bearing
(2) Connecting Rod
E. CONNECTING ROD
The connecting rod (2), which converts the reciprocat-
ing motion of the pistons caused by the fuel combus-
tion into the rotating motion of the crankshaft, is made
of harden forged steel. The connecting rod has bear-
ings at both ends. The small end has a solid type bear-
ing (small end bushing (2)) and the big end has a split
type bearing (crankpin bearing (3)).
D. PISTON AND PISTON RINGS
The piston are made of an aluminum alloy which is
temperature and pressure resistant. Three rings in-
stalled in grooves of 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 pre-
vents 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 against the cylin-
der wall to scrape the oil. The top ring is plated with
hard chrome to increase wear resistance (The ring of
4A200T engine is mode of a special steel).
C. CRANKSHAFT
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 bear-
ing case (3) having a bearing inside.
The front crankshaft bearing (2) is a solid type bushing
and rear and intermediate bearings are a split type.
The crankshaft’s bearings have oil holes for lubricant
flow.
(1) Crankshaft (4) Crankshaft Bearing 2
(2) Crankshaft Bearing (5) Thrust Bearing
(3) Main Bearing Case