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1 Journal of Polish CIMAC

1 2008

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Reasons Of A Thrust Ring Damage In Oil-Cooled Piston Head In A Dual Fuel Ci Engine Fuelled With Gas And Diesel Oil

Stelmasiak Z., Wencelis J., Larisch J.

Journal of Polish CIMAC

2008

Vol. 3, no 2

9-13

The paper presents a test results explaining reasons of thrust ring damage in piston head’s cooling system of the Caterpillar 3516A engine run in dual fuel system. Task of the ring is to stop the oil injected by oil nozzles and to improve uniformity of piston head cooling. In the engine run on mine gas occurred two breakdowns in the pistoncylinder assembly; probably reason of these breakdowns was a fracture of the thrust ring. In connection with it, damaged rings were tested metallographicaly and dimensionally to find reasons of the fracture. Performed tests showed that the most probably reason of the breakdowns is wrong mounting of the ring in the piston head, causing its bending during engine operation by inertia forces and fatigue fracture in overstrained cross-section, in area of oil holes.