The is a 4.3L OHC (overhead camshaft) direct-injection diesel engine widely used in Isuzu Elf and N-Series trucks. While users often search for a "6-cylinder" version of this specific manual, it is important to clarify that the 4HF1 is strictly a 4-cylinder engine . Users looking for 6-cylinder Isuzu engine documentation typically require manuals for the 6HF1 or the 6H-Series . Isuzu 4HF1 Engine Specifications