Description

This Cummins 4B 3.3 Complete Engine Rebuild Kit is designed for professional engine overhauls and full restorations of Tier 2 naturally aspirated Cummins B3.3 engines . Engineered to meet or exceed OEM specifications, this rebuilt kit restores factory compression, oil pressure, and combustion efficiency for long-term reliability in industrial and construction applications. The kit is fully compatible with Komatsu 4D95LE-3 engines , commonly used in Komatsu WA65-5, WA70-5, and WA80-5 wheel loaders , making it an ideal solution for heavy-duty equipment rebuilds. This rebuilt kit includes precision-machined pistons (M: 2170) , matched piston rings, main and connecting rod bearings, thrust washers, gasket sets, valve train components, oil and water pump components, seals, bushings, and hardware. Every component is carefully selected to ensure correct clearances, optimal lubrication, and extended engine life. Whether you are rebuilding a worn engine, addressing oil consumption, restoring compression, or performing a complete overhaul, this Cummins 4B 3.3 rebuild kit delivers dependable performance, reduced downtime, and long-term durability. Designed for 199 cubic inch (3.3L) 4-cylinder engines with a 95 mm bore and 115 mm stroke , this kit supports standard, 0.25 mm oversize, and 0.50 mm oversize configurations to match your machining requirements. ⚙️ Engine Compatibility & Specifications Engine Series: Cummins B Engine Model: B3.3 / 4B 3.3 Aspiration: Naturally Aspirated Emissions Tier: Tier 2 Cylinders: 4 Displacement: 199 Cubic Inches (3.3L) Bore: 3.74 in / 95 mm Stroke: 4.52 in / 115 mm Piston Type: M – 2170 Equipment Compatibility: Komatsu 4D95LE-3 Engines Komatsu WA65-5 Komatsu WA70-5 Komatsu WA80-5 📦 Rebuilt Kit Includes 🔩 Piston & Ring Components Pistons (STD / 0.25 mm / 0.50 mm) Matched Piston Ring Sets Piston Pins Retainers Piston Bushings (x4) ⚙️ Bearings & Rotating Assembly Main Bearing Set (Multiple Undersizes Available) Connecting Rod Bearing Set (Standard & Fractured Rod Options) Thrust Washer Set Crankshaft Bearings Connecting Rod Bolts 🧰 Gaskets & Seals Complete Overhaul Gasket Set Head Gasket Options Front Crankshaft Seal Rear Crankshaft Seal Water Pump Gasket 🔥 Valve Train Components Intake & Exhaust Valves Valve Guides Valve Springs Valve Seats & Inserts Valve Stem Seals Valve Retainers Tappets Push Rods 🛢️ Oil & Cooling System Oil Pump (12 mm or 21 mm Gear Options) Oil Cooler Water Pump 💉 Fuel System Injector Repair Sleeves