The Nissan K21 engine is a high-performance, water-cooled, inline 4-cylinder overhead valve (OHV) assembly engineered for demanding industrial applications, particularly in forklifts from brands like Nissan, Komatsu, TCM, and others. With a displacement of 2.065 liters (126 cubic inches), it features a bore of 89 mm (3.5 inches) and stroke of 83 mm (3.27 inches), providing robust power output ranging from 45-54 HP at 2,700 RPM and torque up to 151 N·m (111 lb-ft) at 2,000 RPM, depending on fuel configuration.
Available in gasoline, LPG (liquefied petroleum gas), or dual-fuel variants, this engine incorporates electronic fuel injection (ECCS) in modern models for optimized efficiency, reduced emissions, and compliance with industrial standards. Key features include a timing chain drive, liquid cooling system, and a compression ratio of 8.7:1 (gasoline) or 9.3:1 (LPG), ensuring durability and low maintenance in high-load environments.
Ideal for forklifts with capacities up to 3,000 lbs, the K21 offers a firing order of 1-3-4-2, idle speed of 700 RPM, and maximum engine speed of 3,600 RPM (no load). It includes components like a cylinder head, oil pan, valve cover, and hydraulic/timing mechanisms for reliable operation. Backed by Nissan’s engineering expertise, this engine is built for longevity, with recommended 10W-30 API SJ oil and a 3.7-liter capacity (with filter). Whether for replacement, rebuild, or new installations, the K21 delivers proven performance in warehouse, construction, and logistics settings.
Specifications Summary:
- Engine Type: Inline 4-cylinder, OHV, water-cooled
- Displacement: 2,065 cc
- Power: Up to 54 HP (gasoline/LPG)
- Torque: Up to 151 N·m
- Fuel Types: Gasoline (89 octane min), LPG
- Dry Weight: Approximately 138 kg
- Dimensions: 71.7 cm (L) x 56.8 cm (W) x 72 cm (H)
For service manuals and maintenance, refer to official Nissan resources.
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