Which of the indicator diagrams illustrated indicates the condition that should be corrected by retarding the timing, and the fitting of thicker shims to the connecting rod? Illustration MO-0029

Question

Which of the indicator diagrams illustrated indicates the condition that should be corrected by retarding the timing, and the fitting of thicker shims to the connecting rod?  Illustration MO-0029

Accepted Answer

Option D: D. Indicator diagram 'D' exhibits high peak pressures requiring both injection timing retardation and increased clearance volume, achieved by installing thicker connecting rod shims to lower compression pressures.