North America
Stage IV emission technology

Tier 4 Final Technology

Maximized performance

Explore the Tier 4 Final engine range

A system of benefits

Our entire Tier 4 Final / Stage IV certified engine range maximizes efficiency while delivering the power and reliability our customers demand. We developed a simple Selective Catalytic Reduction (SCR) system together with light Exhaust Gas Recirculation (EGR). The Volvo Penta Tier 4 Final / Stave IV solution means less maintenance for customers, as well as better productivity and uptime. The single canister Volvo Penta solution allows OEMs to optimize their packaging instead of having to design and install two catalysts. 

Easy and reliable

Emissions are reduced by means of SCR technology. There are many ways to build an SCR system. At Volvo Penta, we’ve kept our SCR as simple and reliable as possible. While others have chosen more complex installations and C-EGR (cooled exhaust gas recirculation) systems – we use only two parts: SCR and light EGR. The benefits are obvious: the fewer components used, the easier the installation will be and the less risk of part failure or system malfunction.

Proven, Smart Technology

Together with the EGR for optimization of the exhaust gas temperature, the engines fulfill environmental standards. Using proven, smart technology, the rigorously tested engine system meets both the demanding Stage IV (EU) and Tier 4 Final (US) emission reduction requirements and improves fuel efficiency by up to 5%. While most Stage IV/Tier 4 Final engines require a DPF (diesel particulate filter) or a DOC (diesel oxidation catalyst), Volvo Penta’s Stage IV/Tier 4 Final engines use only SCR.

The benefits of the Volvo Penta solution

Opting for a SCR solution to meet the Tier 4 Final / Stage IV emission legislation comes with a number of benefits and advantages. Volvo Penta has all the components and hardware available from the factory for the correct installation of the Aftertreatment system. This means that the components are Volvo Penta approved, designed to work with one another and any warrantable claims are simplified. 

Easier Installation

Utilizing a light EGR system means there is no added cooling need on the package. Our Tier 4 Final engines have the same or lower cooling demand than lower tiered systems. Lower cooling demands translates to lower noise levels and minimized costs for the radiator package. This enables manufacturers to house the cooling system in installations where space is limited. 

Maximised Power Output

The Volvo Advanced Combustion Technology and the SCR system turn more fuel energy into mechanical power – which leads to less heat rejection – meaning that the power output can be maximized for any given engine displacement. The result is smaller engine sizes, reduced costs, and simplified installations. 

Reduced Overall Costs

For the end users, the principal benefits of the SCR engines start with unsurpassed fuel efficiency that cuts operating costs. The SCR catalyst is designed for the life of the engine. Under correct operation the catalyst does not need to be replaced or removed for cleaning. The costs for maintenance and downtime are also reduced. 

The Truth about EPA Tier 4 Final for Diesel Gensets

The Environmental Protection Agency (EPA) has established scaled standards to restrict emissions of nitrogen oxides (NOx), carbon monoxide (CO), particulate matter (PM) and non-methane hydrocarbons (NMHC). These standards have been implemented in stages over the last 24 years. The latest and most restrictive EPA standard for stationary diesel engines today is Tier 4 Final, which reduces emissions up to 99 percent compared to previous tiers.

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Towards sustainability

Environmental care is one of Volvo Penta’s core values and we work actively to develop resource efficient products with low environmental impact. However, sustainability means more than just emission levels. It is just as much about fuel economy, ease of installations and the total cost of ownership – all the parts that lower the environmental impact of your chosen power solution. Field testing to ensure durability, reliability and suitability for the application in the environment where they are to be used, is conducted and the latest advances in technology are employed to ensure that the engines meet emission legislation.

Read more about Volvo Penta’s sustainability initiatives

Volvo Penta Tier 4 Final Engine Range

Engine Family

Displacement Horsepower kW
 D5  5.1L 143-218 105-160
 D8 7.7L  218-320 160-235
 D11 10.8L  320-388 235-285
 D13  12.8L 388-551 285-405
 D16  16.1L 551-700 405-515


Other emission step engine ranges

Stage V
Steg V
Stage II & III/tier 2 & 3
Stage II & III/tier 2 & 3
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