Crankshaft; Connecting Rods - Ezgo 1600xd Repair Manual

3.1.3 CRANKSHAFT

2
3
1
4 7
(1) Crankshaft
(2) Piston
(3) Connecting rod
(4) Crankshaft bearing 1
The crankshaft drives the pistons and connecting rods,
and transfers its reciprocating movement to a circular
camshaft. Six counterweights are integrated into one unit
to minimize bearing wear and lubricating oil temperature
rise.
Seal sliding sections are induction-hardened to raise wear
resistance quality.
Crankshaft journals are supported by the main bearing
cases in which bearings are used.
Crankshaft bearing 1 at the front end is a wind type
bushing.
Thrust bearing 1, 2 of split type are mounted on both sides
of the main bearing case at the fl ywheel side.
Crankshaft bearing and thrust bearings are plated with
special raised alloy wear resistance.
3
-12
ENGINE - STRUCTURE AND FUNCTION
6
5 8
196W211C
(5) Crankshaft bearing 2
(6) Thrust bearing
(7) Counterweight
(8) Main bearing case
3.1.4 PISTON AND PISTON RINGS
4
3
2
5
4
6
(1) Rib
(2) Top ring
(3) Surface
Piston circumference has special elliptic shape in
consideration of expansion due to heat. The piston head
is fl at formed and ribbed to reduce distortion and to help
heat radiation.
Pistons are made of special aluminum alloy of low thermal
expansion and high temperature resistance. The key
stone type top ring is well fi tted to the wall and plated with
hard chrome.
Second ring type is effective in preventing oil rising.
The oil ring is effective because it is closely fi tted to the
cylinder wall by a coil so oil can be scraped from the upper
and lower ends of its sliding cylinder walls.
A portion of the scraped oil is forced inside the piston
through escape holes of the. rings and pistons. The oil ring
is plated with hard chrome to raise the wear resistance
quality.

3.1.5 CONNECTING RODS

3
2
(1) Connecting rod
(2) Crankpin bearing
The connecting rod is used to connect the piston with the
crankshaft. The big end of this rod has crankpin bearings
(split type) and the small end has a bushing (solid type).
1
196W212B
(4) Hard chrome
(5) 2nd ring
(6) Coil expander ring
1
196W213B
(3) Bushing
SUUV-W00 Apr. 2011