With reference to two stroke, slow speed engine pistons: (a) Explain what is meant by the term thermal stress and how this can cause cracking of crown surface (4) (b) Sketch a cross-section of a piston, labeling the main components and indicating coolant flow (8) (c) State a cause of EACH of the following defects (i) Burning of crown upper surfaces (2) (ii) Carbon deposits in the cooling surfaces (2)
Piston & piston rings
UKM Tuticorin 
Leave a comment