2012 SSANGYONG KORANDO Service Manual

02-231311-01
Layout and Location
Hydraulic chain tensioner
In G20DF engine, the hydraulic auto tensioner is used to keep the tension for chain drive system of
engine. The auto tensioner is operated by the spring in tensioner and the hydraulic pressure.
2) Hydraulic Auto Tensioner
Oil gallery

02-24
3) Oil Pump Chain Tensioner
Layout and Location
Oil pump chain tensioner
Operated by spring in tensioner
Tensioner type: Compensating and absorbing the impact
Static and dynamic force: spring -
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02-251311-01
A. Timing chain
B. Oil pump chain
4) Timing Chain and Gear
Timing chain ▶
Simple layout provides the optimized timing.
Decreased chain vibration and noise
Single stage layout: minimized chain load -
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- Teeth: 146 ea
Teeth: 58 ea

02-26
Clamping rail
Installed between intake
camshaft sprocket and
crankshaft sprocket
5) Chain Rails
The chain rails are used for optimizing the movement of chain drive system. And they also prevent the
chain from contacting each other when the chain is loose, and reduces the chain wear. The chain rail is
normally made of PA (Polyamide nylon), and PA66 and PA46 are used for the chain rails in G20DF
engine. For the tensioner rail, PA46 is used to provide high anti-wear function and high strength since
the load to the rail is huge. Ther is an open area for shoulder bolt hole in the clamping rail. The chain
rails are installed by shoulder bolts.
Tensioner rail
Installed between
exhaust camshaft
sprocket and crankshaft
sprocket

02-271130-13
1) Overview
Dual mass flywheel (DMF)
- Manual transaxleDrive plate
- Automatic transaxle
Dual mass flywheel reduces the unbalanced
rotation of crankshaft in manual transaxle
equipped vehicle. The flywheel is installed on the
crankshaft and is engaged to the clutch disc to
transfer the driving torque from the engine to the
powertrain system. Additionally, DMF decreases
the rattling noise in transaxle and the vehicle
vibration by reducing the differences of torque and
rotational speed due to the combustion in engine.The drive plate initially drives the powertrain
system by using the power from the start motor
when starting the engine. The drive plate is
installed on the crankshaft and is engaged to the
torque converter of automatic transaxle to transfer
the driving torque from the engine to the powertrain
system.

02-28
2) Operation of DMF
Compensating the irregular operation of engine: The secondary flywheel operates almost evenly so
does not cause gear noises
The mass of the primary flywheel is less than conventional flywheel so the engine irregularity
increases more (less pulsation absorbing effect).
Transaxle protection function: Reduces the torsional vibration to powertrain (transaxle) by reducing
the irregularity of engine. -
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Compression stroke Combustion stroke
Small changes from engine (k):
Damper increases the torque changes to clutchLarge changes from engine (j):
Damper decreases the torque changes to
transaxle by absorbing the impact
Torque change curve of engine and drive shaft

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3) Features of DMF
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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4) Advantages of DMF
Improved torque response by using 2-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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02-30
Components
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.Overview ▶
Layout and Components ▶
Top
Bottom
Oil ring
Piston ring
No.1 ring
Piston pin
No.2 ringSnap ring
Piston