SsangYong Stavic / SsangYong Rodius (2005 year). Manual — part 91
DI02-39
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ENGINE HOUSING
DI ENG SM - 2004.9
Notice
The retaining lugs should be positioned in the grooves
(arrow).
Notice
If the maximum permissible length of L= 63.8 mm is
exceeded, the 12-sided stretch bolts should be
replaced.
2. Coat the upper thrust washers with oil and insert into the
crankcase so that the oil grooves are facing the crank
webs (arrow).
3. Coat the lower thrust washers with oil and insert into the
crankcase so that the oil grooves are facing the crank
webs (arrow).
1. Thoroughly clean the oil galleries and check the journal
section and bearings. Replace if necessary.
4. Coat the new crankshaft with engine oil and place it on
the crankcase.
5. Install the crankshaft bearing caps according to the
markings and tighten the bolts.
Installation Notice
Tightening torque
55 ± 5 Nm + 90° + 10°
•
Install from #1 cap.
Crankshaft - Reassembly
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ENGINE HOUSING
DI ENG SM - 2004.9
6. Position the #1 piston at TDC and install the crankshaft.
7. Install the piston connecting rod journal to the crankshaft
journal and tighten the bolts.
8. Measure the crankshaft bearing axial clearance.
• When new: 0.100 ~ 0.245 mm
• When used: 0.300 mm
9. Rotate the crankshaft by hand and check whether it
rotates smoothly.
DI02-41
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ENGINE HOUSING
DI ENG SM - 2004.9
FLYWHEEL
System Description
This flywheel is installed to the rear end of crankshaft and transfers the output from the engine to the power train
mechanism. When starting the engine, this drive the crank train mechanism initially by using the power from the start
motor. Also, DMF measure the crankshaft speed, sends the signals to ECU, and controls the ignition timing.
DUAL MASS FLYWHEEL (DMF, MANUAL TRANSMISSION EQUIPPED VEHICLE)
Primary wheel
Primary wheel
Secondary
wheel
Ring gear
Plastic bushing
Conventional flywheel
DMF
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DI ENG SM - 2004.9
<Example of DMF operation>
System Characteristics
Function
• Filters irregularities 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)
• Transmission protection function: Reduces the load to
powertrain (transmission) by blocking the irregularity
of engine
Characteristics of DMF
• Reduced vibration noise from the powertrain by blocking
the torsional vibrations
• Enhanced vehicle silence and riding comforts: reduced
engine torque changes
• Reduced shifting shocks
• Smooth acceleration and deceleration
Structure
Function and characteristics
• When the output changes from the engine is high during
power stroke (
): The damper absorbs the shocks to
reduce the changes to transmission.
• When the output changes from the engine is low during
compression stroke (
): The damper increases the torque
changes to clutch.
Advantages of DMF
• 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)
<Torque change curve of engine and drive shaft>
Angular acceleration amplitude [1/s
2
]
Speed [rpm]
Conventional system
Speed [rpm]
DMFW
Transmission
Engine
Transmission
Engine
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