What does a crankcase depression regulator do?

On a 6.5L GM diesel, the CDR valve is located on the passenger side valve cover and extracts fumes through the valve cover and into the compressor (intake) side of the turbocharger. The CDR valve is necessary to control negative pressure in the crankcase.

What is a CDR on a diesel engine?

The CDR cannister, affectionately known as the “tuna can”, is a Positive Crankcase Ventilation system for Diesels. It provides regulated low-vacuum, about 1″ at idle to 4 to 6 inches WC at full load, from the engine air intake path to remove blow-by gases from the crankcase, and prevent oil leaks.

Why are engines utilizing crankcase ventilation?

Although the modern purpose of a positive crankcase ventilation (PCV) system is to reduce air pollution, the original purpose was to allow an engine to operate underwater without the water leaking in.

What is the maximum amount of Sulphur allowed in diesel fuel?

15 ppm
Overview of Diesel Standards EPA began regulating diesel fuel sulfur levels in 1993. Beginning in 2006, EPA began to phase-in more stringent regulations to lower the amount of sulfur in diesel fuel to 15 ppm.

What is diesel Oxidation Catalyst?

Diesel Oxidation Catalysts, also known as DOCs, are. exhaust aftertreatment devices that reduce emissions. from diesel fueled vehicles and equipment.

What does a crankcase filter do on a diesel engine?

The crankcase filter simply filters the blow by gases to make sure that they are clean before they are rerouted back into the vehicle’s intake manifold. Over time, the filter can get dirty and restrict the air flow, and therefore pressure relieving capacity of the system.

Is crankcase ventilation necessary?

The crankcase ventilation system is more important than people know. When there’s a problem, it can cause oil sludge build-up, oil leaks, and oil consumption. Most engines have the following problems: Churning oil creates pressure.

What happens if you don’t use ultra low sulfur diesel?

Serious damage will occur without it. Sulfur in diesel fuel must be lowered to become compatible with modern pollution-control technology being installed on later model diesel engines. This equipment will reduce fine particles (soot) and pollutants in diesel exhaust by over 90\%.

What does ppm stand for in diesel?

Most new diesel engines that employed advanced exhaust aftertreatment technology have become sensitive to sulphur, which is why Caltex offers the ultra-low sulphur diesel fuel with a sulphur level as low as 10 parts per million (ppm) – the environmentally ‘green’ and clean diesel fuel.

How do diesel particulate filters work?

Diesel particulate filters operate by trapping soot particles from the engine exhaust, preventing them from reaching the environment. The most common diesel particulate filters in widespread use are cellular ceramic honeycomb filters with channels that are plugged at alternating ends, as shown in Figure 1.

Do diesel engines have catalytic convertors?

This type of catalytic converter is widely used on diesel engines to reduce hydrocarbon and carbon monoxide emissions. They were also used on gasoline engines in American- and Canadian-market automobiles until 1981. Because of their inability to control oxides of nitrogen, they were superseded by three-way converters.

What happens if crankcase breather is clogged?

Decrease in engine performance If the filter becomes clogged and causes any vacuum leaks, this may cause a decrease in engine performance due to the disturbance in the air-fuel ratio. The vehicle may experience a decrease in power and acceleration, especially at low engine speeds.

Answer Wiki. Crankcase Depression Regulator (CDR) is a valve, to maintain crankcase pressure. Valve is letting the blowby crankcase gases by reliefing. It has several important duties in some motor vehicle diesels and it is also important safety device in some high power marine engines for crankcase explosions.

What is the function of the CDR valve?

The CDR valve is responsible for controlling the pressure/vacuum in the engine crankcase, and separating the oil mist from the air and returning the oil to the crankcase.

Do diesel engines need closed crankcase ventilation?

For heavy-duty vehicles complying with EPA 2004 on-highway standards, only naturally aspirated engines required closed crankcase ventilation (CCV). Turbocharged and supercharged diesel fueled engines were exempt from requirements to control the discharge of crankcase emissions.

What is the most common cause of crankcase blowby?

In total, these components can be responsible for as much as 40\% of the crankcase blowby [1774]. Turbochargers and air compressors are often lubricated with oil supplied by the engine’s oil pump and drained back into the engine’s crankcase.