K21 Engine Guide

Complete guide for the Nissan K21 forklift engine

45-50 HP

Power Output

2.1L Displacement

Engine Size

LPG/Propane

Fuel Type

The K21 engine is a reliable and efficient 4-cylinder powerplant commonly found in Nissan forklifts. This comprehensive K21 engine guide covers specifications, maintenance schedules, troubleshooting, and replacement parts for optimal performance.

K21 Engine Specifications

Engine Type:4-cylinder, water-cooled
Displacement:2.1L (2,068 cc)
Power Output:45-50 HP
Fuel Type:LPG/Propane
Cooling System:Liquid-cooled
Bore x Stroke:85mm x 91mm

K21 Engine Applications

The K21 engine is widely used across multiple Nissan forklift models, providing reliable power for material handling operations.

Nissan FD30 Forklift
Nissan FD40 Forklift
Nissan FD50 Forklift
Nissan FD60 Forklift

K21 Engine Maintenance Schedule

Proper maintenance is crucial for optimal K21 engine performance and longevity. Follow this comprehensive maintenance schedule to keep your engine running smoothly.

D

Daily Checks

  • Check engine oil level
  • Inspect coolant level
  • Check for leaks
  • Listen for unusual noises
250

Every 250 Hours

  • Change engine oil and filter
  • Check and adjust valve clearance
  • Inspect spark plugs
  • Check ignition timing
500

Every 500 Hours

  • Replace air filter
  • Change fuel filter
  • Check and adjust carburetor
  • Inspect cooling system

K21 Engine Troubleshooting

Experiencing issues with your K21 engine? Use this troubleshooting guide to diagnose and resolve common problems quickly and efficiently.

Hard Starting

Check spark plugs and ignition system
Verify fuel pressure and delivery
Inspect carburetor for proper adjustment
Check battery condition and connections

Overheating

Check coolant level and condition
Inspect radiator and cooling system
Verify thermostat operation
Check water pump function

Loss of Power

Check air filter condition
Inspect fuel system components
Verify valve adjustment
Check compression levels

K21 Engine FAQ

What is the horsepower of a K21 engine?▼
The K21 engine produces 45-50 horsepower, making it ideal for mid-size forklift applications including the Nissan FD30, FD40, FD50, and FD60 models.
What fuel does the K21 engine use?▼
The K21 engine is designed to run on LPG (Liquid Propane Gas) or propane, providing clean combustion and reduced emissions compared to gasoline engines.
How often should I service my K21 engine?▼
Follow the maintenance schedule: daily checks for oil and coolant, oil changes every 250 hours, and major service (filters, carburetor) every 500 hours for optimal K21 engine performance.
Where can I get K21 engine parts?▼
Flat Earth Equipment stocks genuine and aftermarket K21 engine parts with same-day dispatch. Use our quote form below to get pricing on specific parts for your forklift.

Get K21 Engine Parts Quote

Need K21 engine parts? Get a fast, accurate quote from our experts. We stock genuine and aftermarket parts for all Nissan forklift models.

Same-day dispatch
Nationwide shipping
Expert support

Related K21 Engine Resources

K21 Engine Insights

In-depth analysis of K21 engine performance, specifications, and comparisons with other models.

Forklift Parts Catalog

Browse our complete inventory of forklift parts for all major brands and models.

Forklift Rentals

Rent quality forklifts with K21 engines for short-term or long-term projects.