2012 SSANGYONG NEW ACTYON SPORTS Service Manual

02-40
(3) Functions
Piston transfers the combustion energy from engine to connecting rod. Especially in the direct
injection engine such as D20DTF, 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 pin
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.

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EnginePiston Cylinder bore
Part NO Marking NO.-
D20DTF 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

02-42
2) Connecting Rod
(1) Overview
Connecting rod converts the reciprocating movement of piston to the rotating movement of
crankshaft. The big end is connected to connecting rod bearing and the crank pin journal, and the
small end is connected to the piston pin.
(2) Components
Piston pin bush
Connecting rod
Connecting lower bearing
Connecting rod cap
Connecting rod cap bolt
Connecting rod upper bearing

02-430000-00
NoConnecting
rod/ Bore
diameter in big
endUpper bearing Lower bearing
Journal
diameter of
crank pinOil
clearance o
f
bearing
GradeBearing
thicknessGradeBearing
thickness
1
54.600 R 1.804
B 1.812
50.935 0.017
1.808 1.815 0.063
2
Y 1.808
Y 1.809 0.016
54.614 1.812 1.812
50.960 0.062
3
B 1.812
R 1.806 0.015
1.816 1.809 0.061
Min. 0.015
Max. 0.063
(3) Selection of crankshaft pin journal bearing
The connecting rod bearing contains 3 sets of 3 grades in upper and lower sections.
Three sets in the table below have nearly same oil clearance (0.015~0.063 mm) of bearing.
Identification: Coloe mark on bearing side surface -
-
-
Oil clearance of connecting rod bearing

02-44
3) Crankshaft
(1) Overview
Crankshaft is installed on the cylinder block.
(2) Arrangement
Crankshaft main bearing upperCrankshaft main bearing upper
Upper thrust bearing
Crankshaft main bearing lowerCrankshaft main bearing lower
Lower thrust bearing
Crank pin journalMain journal

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Selection of bearing according to pin punch
& color
Mark Color Thickness of main
bearing
* Blue 66.500~66.506
** Yellow 66.506~66.513
*** Red 66.513~66.519
(3) Selection of crankshaft main bearing
Mark Color Thickness of main
bearing (mm)
V Violet +0.030
+0.025
W White +0.025
+0.020
R Red +0.020
+0.015
Y Yellow +0.015
+0.010
B Blue +0.010
+0.005
2.25
2.25
2.25
2.25
2.25
Bottom of cylinder block
Selection of upper main bearing
Mating surface of crankshaft sprocket
Selection of lower main bearing

02-46
4) Cylinder Block
(1) Overview
The major dimensions in D20DTR are similar to
D20DT engine. It has two mounting
bosses for knock sensor and meets the
requirements for EURO5 regulation.
(2) Layout
Right sideRight side
Expansion plug
Screw plug

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Left sideExpansion plug
(3) Features
For simple manufacturing, the crankcase
blow-by gas passage and the oil return hole
are made by casting on the cylinder block.