Isuzu 4JJ1

The Isuzu 4JJ1 is a four-cylinder industrial diesel engine fitted across a wide range of construction and industrial equipment. This page brings together every 4JJ1 manual we carry: repair, troubleshooting, and parts, all in one place.

For full repair coverage, start with the 4JJ1 Series Workshop Manual or the AI-4JJ1X Shop Manual. To trace a fault, use the AI-4JJ1X Troubleshooting Manual.

Need exact components? We stock parts catalogs for most 4JJ1 variants, including the 4JJ1XZSB03, 4JJ1XYSB01, and 4JJ1TASB01. All are listed below.