The lowest ring of a piston is _____.A.a coil springB.a sealing ringC.an oil distributor r

Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine？

Visual inspection of chrome－plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which .

When inspecting piston rings through the ports of a two－stroke／cycle diesel engine, black

For any piston ring to operate smoothly without scuffing ,the ring must be ______.A.of a m

The main function of piston compression rings is to _______.A.prevent excessive cylinder l

If the piston groove drain holes for the oil control rings become clogged, which of the fo