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The Perkins® 400 Series engine family continues to set new standards in the compact engine market. Developed alongside customers to fulfil their needs in the generator set market, they have been designed to comply with stringent emissions regulations for EU and USA. The 402 product range offers a highly compact Perkins electro units to provide robust 2 cylinder diesel engines designed to provide economic and durable operation for prime power applications, hitting the key power nodes required by the power generation industry.

402J-05G Electro Unit

3.5-3.9 kVA

EU Stage V

Power Rating

Mechanical Output** 3.6-4.0 kWm 3.6-4.0 kWm Less
Electrical Output** 3.5-3.9 kVA (2.8-3.2 kWe) 3.5-3.9 kVA (2.8-3.2 kWe) Less
Rated Speed 1500 rpm 1500 rpm Less

Emission Standards

Emissions EU Stage V EU Stage V Less


Bore 2.6 in 67.0 mm Less
Stroke 2.8 in 72.0 mm Less
Displacement 31.0 in³ 0.5 l Less
Aspiration Naturally aspirated Naturally aspirated Less
Rotation from Flywheel End Anti-clockwise Anti-clockwise Less
Total Coolant Capacity 0.3 gal (US) 1.1 l Less
Combustion System Mechanical indirect injection Mechanical indirect injection Less
Total Lubricating Capacity 0.5 gal (US) 2.0 l Less
Compression Ratio 23.5:1 23.5:1 Less
Number of Cylinders 2 inline 2 inline Less
Cooling System Watercooled Watercooled Less

Engine Dimensions*

Width 14.6 in 371.0 mm Less
Dry Weight 126.0 lb 57.0 kg Less
Length 16.0 in 406.0 mm Less
Height 20.6 in 523.0 mm Less


Note 1 Final dimensions dependent on selected options Final dimensions dependent on selected options Less

Maximised productivity

Maximised productivity by achieving key power nodes with clean rapid starting in all conditions whilst delivering impressive steady state and transient response. Options between Stage V certified products for the EU mobile genset market and Tier 4 Final certified products for the US mobile genset market ensures flexibility for our customers tailored to their needs.

Ease of integration

The 400 Series offers a range of mechanical engines that are designed to be compact, simple to run under all conditions and easy to maintain. Some features include spin-on filters and cassette-type fuel injection pumps for ease of integration and service accessibility.

Minimise cost of ownership

The 400 Series mechanical engine range offers optimised fuel consumption and low oil consumption whilst meeting the Stage V and Tier 4 Final emissions standards; all delivered from a reliable mechanical engine to minimise cost of ownership.

Low operating costs

Perkins engines are designed and developed with our customer in mind. Keeping service cost to a minimum ensures low periodic running costs. This is achieved through 500 hour service intervals for oil and fuel as standard under all operating conditions.

Long productive life

The long productive life of our products is supported through the Perkins 12 month warranty as standard for prime power applications, and the 1500 hour or two year emissions warranty. For further peace of mind, there is also the option to purchase Extended Service Contracts through Perkins Platinum Protection. Contact your local distributor or visit ww.perkins.com/en/GB/aftermarket/perkins-platinum-protection.

Manufacturing quality

Perkins takes pride in manufacturing all products globally to the same high quality standard. All of our products are manufactured in world class facilities to ensure highest quality for your peace of mind.

402J-05G Standard Equipment

Electro unit

Fuel filter, engine mounted

Fuel priming pump (manual)

Air filter, engine mounted

Fuel system
  • Starter motor
  • Battery charging alternator

Flywheel housing



Fan guard

Temperature and oil pressure for automatic stop/alarm configurable