The Isuzu 4HK1 is a high‑performance inline‑four turbocharged intercooled diesel engine manufactured by Isuzu Motors, launched in 2005. With a displacement of 5193cc (5.2L), it adopts high‑pressure common‑rail direct injection, 4‑valve per cylinder structure and robust cast‑iron block, featuring stable power output, low fuel consumption and excellent durability.