2012 SSANGYONG NEW REXTON Service Manual

4) Features
Reduced vibration noise from the powertrain by blocking the torsional vibrations
Enhanced vehicle silence and riding comforts: reduced engine torque fluctuation
Reduced shifting shocks
Smooth acceleration and deceleration -
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5) Advantages
Improved torque response by using 3-stage type spring: Strengthens the torque response in all
ranges (low, medium, and high speed) by applying respective spring constant at each range.
Stable revolution of the primary and secondary wheel by using planetary gear: Works as auxiliary
damper against spring changes
Less heat generation due to no direct friction against spring surface: Plastic material is covered on
the spring outer surface
Increased durability by using plastic bushing (extends the lifetime of grease) -
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6) Drive Plate
Drive plate receives the power from the start motor when starting the engine. With this, the drive plate
initially drives the power train system. And, it is connected to the torque converter to transfer the engine
torque to the power train system.
Trigger ring
Drive plate
Components

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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

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 ringMaterial: B2+
Skirt coating:
MoS2
Piston cooling gallery for
connecting rod
Wide bawl type (CR 16.5)
Cooling jet

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(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.
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(4) Assembling the piston
Install the piston rings with the "Y" mark on the
ring facing upwards.
away from the end gap of #1 ring.
away from the end gap of coil spring, and
from the end gap of #2 ring. 1.
2.
3.

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

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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

NoConnecting
rod/ Bore
diameter in
big endUpper bearing Lower bearing
Journal
diameter of
crank pinOil
clearance of
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 -
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Oil clearance of connecting rod bearing

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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