Isuzu 4JB1 Forklift/Truck Connecting Rod 8-94329-692-0 / 8943296920 — Shunjun Brand, Cr40 Steel

This is the connecting rod for the Isuzu 4JB1 2.8L 4-cylinder diesel engine (part number 8-94329-692-0, cross-reference 8943296920) — one of the most widely produced and longest-running small diesel engines in global industrial history. The 4JB1 engine powered Isuzu NPR/NKR light trucks, Isuzu forklifts, and industrial equipment from 1984 through 2009 — a production run spanning 25 years. The connecting rod is the forged steel link between the piston and the crankshaft that converts the reciprocating linear force of combustion into rotational torque. On the 4JB1 engine running at its governed speed of 3,600 RPM, each connecting rod cycles between maximum tension (pulling the piston down on the intake stroke) and peak compression load (resisting combustion pressure exceeding 1,000 psi) 60 times per second — generating millions of alternating stress cycles over the engine’s service life. The 4JB1 connecting rod is manufactured from Cr40 chromium-alloy steel — a material chosen for its combination of high tensile strength, fatigue resistance, and machinability that allows precise control of the big-end bore dimensions and the small-end bushing press-fit.

This Shunjun brand rod is manufactured in Henan, China with a 1-year warranty. New condition, neutral packing. 1.3 kg gross weight (26×10×4.5 cm package). Isuzu 4JB1 engine model for industrial equipment (1984-1990) and vehicles (1996-2009). Customized logo (MOQ 5,000), graphic customization (MOQ 5,000), and customized packaging (MOQ 5,000) available. When replacing a 4JB1 connecting rod, always replace the rod bolts — the 4JB1 uses torque-to-yield bolts that stretch permanently during the first installation and cannot be reused. Measure the big-end bore for out-of-round at 0°, 45°, 90°, and 135° using a bore gauge — an out-of-round bore crushes the bearing shell on one axis, reducing oil clearance to zero at that point and causing a spun bearing within the first hours of operation. The small-end bushing must be pressed to the correct interference fit and the piston pin clearance verified with a micrometer and bore gauge. All four connecting rods in a 4JB1 engine must be weight-matched within 2 grams of each other — a weight difference creates rotating imbalance that increases main bearing loading on specific journals. Prime the oil system by cranking with the fuel shut off until oil pressure registers on the gauge before first start after rod replacement.

Compatible with Isuzu 4JB1 diesel engines in forklifts, NPR/NKR light trucks, and industrial equipment (1984-2009). Browse our connecting rod selection for Nissan K25 and Xinchai 4D35G. For engine specifications, visit Isuzu official website.

Technical Specifications

Compatible Models

Cr40 forged steel. 1-year warranty. Confirm your Isuzu engine model →