SsangYong Rodius (2013 year). Manual - part 50

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10. PISTON/CRANKSHAFT/CYLINDER BLOCK

The crankshaft and the cylinder block convert the compression pressure to the rotating energy.

Components

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Cylinder block

Piston

Connecting rod

Crankshaft

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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 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.
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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Selecting piston oversize

Top of piston

Top of cylinder block

Engine

Piston

Cylinder bore

Part NO

Marking NO.

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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 

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