Cummins’ venerable 5.9-liter ... This was also when first versions of the 24-valve, 5.9-liter engines were introduced. The new four-valves-per-cylinder design improved the engine's efficiency ...

Diesel engines are common in pickup trucks, like the Cummins 6.7- and 5.9-liter engines that power ... alignment peg works itself loose from the cylinder head and wreaks havoc on the engine.