SsangYong Actyon Sports II. Instruction - page 18
02-38
10. PISTON/CRANKSHAFT/CYLINDER BLOCK
The crankshaft and the cylinder block convert the compression pressure to the rotating energy.
Components
▶
Cylinder block
Piston
Connecting rod
Crankshaft
02-39
0000-00
1) Piston
(1) Overview
Piston assembly contains piston, #1 ring, #2
ring, oil ring, piston pin and snap ring. The
expansion energy from engine is transferred to
the crankshaft through connecting rod to convert
the linear movement to rotating energy.
(2) Layout
#1 ring
Oil ring
Snap ring
#2 ring
Material: B2+
Skirt coating:
MoS2
Piston cooling gallery for
connecting rod
Wide bowl type (CR 16.5)
Cooling jet
02-40
(3) Functions
Piston transfers the combustion energy from engine to connecting rod. Especially in the direct injection
engine such as D20DTR, it provides the combustion space and largely effects to the engine performance
and exhaust gas.
Piston ring
#1 ring (Top ring) : Prevents the high pressurized combustion gas from leaking into crank chamber,
and prevents the engine oil getting into combustion chamber.
#2 ring: Scrapes the engine oil on the cylinder bore, and prevents the leaked combustion gas from #1
ring from leaking into the crank chamber.
Oil ring: Scrapes the engine oil on the cylinder bore.
Piston pin
Connects the piston the connecting rod, and transfers the linear movement of piston to connecting rod
to convert it to rotating energy
Snap ring
Locks the piston pin.
▶
-
-
-
▶
-
▶
-
(4) Assembling the piston
Install the piston rings with the "Y" mark on the
ring facing upwards.
Position the end gap of #1 ring at 180˚
away from the end gap of #1 ring.
Position the end gap of oil ring at 180˚
away from the end gap of coil spring, and
position the end gap of oil ring at 90˚ away
from the end gap of #2 ring.
1.
2.
3.
02-41
0000-00
Engine
Piston
Cylinder bore
Part NO
Marking NO.
-
D20DTR
671 030 06 17
-
-
671 037 07 01
A
A
671 037 08 01
X
X
671 037 09 01
B
B
671 037 10 01
+5
-
671 037 11 01
+10
-
Selecting piston oversize
Top of piston
Top of cylinder block