DUQ1-006E RTA Type Engines Simple Estimation of Piston Ring Wear Amount

For measurement of a piston ring wear amount, it is an usual way to remove a piston ring and measure the ring width by using a gauge. This requires much expense and time because of the necessity of piston with drawing.
Therefore, we introduce a method in which the wear amount can be estimated indirectly by ring gap length hereinafter:

With the piston brought near the bottom dead center using the turning gear, the ring gap length (t) is measured through the liner ports. For the cylinder liner diameter near ports (d) the diameter measured latest or the initial diameter near ports shown in the shop test result should be used.
By substituting these data in the equation given in the following items 3 piston ring wear amount is calculated.