The piston rod scraper box incorporated in a two-stroke/cycle, crosshead diesel engine serves to __________.

Correct Answer: Option C — prevent sludge and dirty oil from entering the crankcase

Piston rod scraper boxes feature spring-loaded scraper rings that wipe down oil and combustion residue running down the piston rod. This vital mechanical barrier prevents dirty oil, sludge, and carbon particles from dropping past the partition bulkhead and contaminating the main crankcase lubricating oil supply.