Question - Describe The Appearance And State The Causes Of Cloverleafing And Microseizure On Cylinder Liners ?
Answer -
Cloverleafing will be caused when the supply of lube oil is not uniform around the radial bore of the liner. The normal effect is for the oil to reduce in alkalinity away from the injection point, thus if the oil becomes acidic then high corrosive wear rates will result.
This will cause uneven bore wear rates, with heavy wear in the areas furthest away from the oil injection points.
Microseizure is caused when the liner and piston ring material is pressed together causing localised welding of the material in the absence of sufficient lube oil.
The causes are insufficient oil and/or excessive cylinder pressures causes heavy ring/liner contact forces. The appearance is heavy scratching/tearing in the vertical direction, together with a localised hardening of the ring and liner material.