SCR components critical in modern diesel engines

In the Mid-February issue of Successful Farming,, I covered the basics of diesel exhaust fluid (DEF). I followed up with a brief overview of the components employed in a selective catalytic reduction (SCR) system.

Keep in mind that the SCR is only one part of the emission control system on a modern diesel engine. It can be fitted with a diesel particulate filter (DPF), diesel oxidation catalyst (DOC), exhaust gas recirculation (EGR), or all of these.


5 often-overlooked engine maintenance tips

When maintaining equipment, often the most simple of additional steps yields the greatest return. The following are five often-overlooked – but crucial – maintenance procedures from the Engine Answerman's must-do list. By taking a few extra minutes now, you'll increase your machine's longevity, make it more reliable in the field, and save you time in the shop making unnecessary repairs.


Tending to MAF sensors

Caring for the mass airflow sensor (MAF) on light-duty diesel pickup engines should be part of every preventive maintenance program. A traditional diesel engine employs a mechanical injection system. Newer pickup engines have electronic controls in place of an injection pump and nozzles.

For the system to determine load, some engines have a MAF sensor that measures the incoming flow of air. Airflow is an accurate indicator of the work the engine is doing. The information from the MAF sensor is used to help determine the quantity and timing of the injection events.


Machining 101: Engine blocks

Part 1 of the Engine Machining Series: Successful Farming’s Engine Answerman reveals the services every machine shop should provide when rebuilding engine blocks.


Diesel-injector nozzles and their care

If you were to talk to diesel manufacturers, they would say the majority of the cost in the engine is found in the fuel system. On a mechanical-injection diesel, this consists of the injection pump and nozzles. These components are the heart of the diesel. They are not only critical to its operation but also extremely costly to replace if a failure occurs.


Keep the hydraulic pressure on

A hydraulic system works under three key principles: A liquid can’t be compressed; resistance to flow is the only way to create pressure in a system; and energy created under pressure will yield either work or heat.

The heart of a hydraulic system is a positive-displacement pump that is either of a fixed-displacement or a variable-displacement style. Either of these pump styles can be a gear, a vane, or a piston design.

A fixed-displacement pump moves the same volume of hydraulic oil with each cycle. Only the speed of the pump modifies the output.