Automobile Engineering in ME
The damper fluid leakage typically occur from

Clearance between inner and outer tubes of damper
Coil spring mounting
Upper damper mounting
Bottom of damper

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Increases the combustion temperature
Creates swirl
Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

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