2011-2013 Isuzu Q Series / QKR 4JB1 Diesel Engine Workshop Service Manual (P/N LNW6ALF000701)

• Covers 2011–2013 Isuzu Q Series and QKR light-duty trucks equipped with the 4JB1 and 4JB1-TC diesel engines
• Official OEM publication P/N LNW6ALF000701
• Contains 100 pages of mechanical specifications, torque settings, system identification, and component disassembly sequences

Engine Service Documentation

Inside this OEM publication, mechanics and DIYers will find exact specifications for the 4JB1 and 4JB1-TC powertrains. The manual clearly outlines inspection criteria and component tolerances for critical internal parts. It details the cylinder head, valve train, camshaft, oil pump, crankshaft, and piston assemblies. You will also find component breakdowns and maintenance requirements for the lubrication, fuel filtering, and cooling systems.

Precision Data and Torque Values

Getting the torque specs right is non-negotiable. This reference lists all necessary fastening norms to rebuild or service the engine block. For example, it dictates a 296 N-m torque for the flywheel attachment and 64 N-m for the timing gear housing bolts. Cylinder head bolt torques are documented in their exact multi-stage sequence. You will see valve clearance parameters mapped out clearly, including the 0.40 mm intake clearance. If you are inspecting the oil pump, the filter relief valve operating pressure sits between 559 and 618 kPa. Please remember to always consult a certified technician before performing service on this equipment to ensure a safe working environment.