Isuzu 6WF1-TC and 6WG1-TC workshop manual. this is the factory service manual. 373 pages.

This manual includes the following sections

00 Service information
6A Engine mechanical
6B Cooling system
6C Fuel system
6D Engine electrical
6E -
6F Exhaust system
6G Turbocharger
6P Power take off

(this is not the common rail version)