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Glossary of terms you will come across during your Phase 2 training.


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Picture of Aaron Connolly

Aaron Connolly

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A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.

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Saps means : Sulphated Ash, Phosphorus and Sulphur.

Low Saps oils contain low levels of sulphated ash, phosphorus and sulphur. This technology optimizes the operation of the depolluting systems (such as particulate filters) fitted to more modern engines.

The SAPS contained in traditional lubricants can have a harmful effect on the post treatment systems that eliminate pollutant emissions. Particulate filters (DPF) are particulary sensitive to SAPS. That is why the new generation of engine oils are developed in order to cater for the needs of the most up-to-date engines.

Picture of Brian Muldoon

Brian Muldoon

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When water is pumped up to a height, that height is known as 'delivery head'. The more powerful your engine is, the higher you can pump the water to.

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There are 4 different types of drive belts.

  1. Ribbed belt: A ribbed belt, is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air pump, etc.
  2. V belt: A belt with a flat bottom and tapered sides, used to transmit motion between two pulleys. Multiple V-belts are often used together in order to increase carrying power
  3. Flat toothed belt: This type of belt is used for anything with timing such as the timing of an engine in a car.
  4. Round belt: Round belts are highly flexible, directionally adjustable, and multi-directional for angular gears. They can be used for conveying as well as for driving applications. As a result of their elasticity, round belts can be installed without a tensioning device.
Picture of Ciaran McEvoy

Ciaran McEvoy

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A diesel particulate filter (or DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Wall-flow diesel particulate filters usually remove 85% or more of the soot, and under certain conditions can attain soot removal efficiencies approaching 100%.

Some filters are single-use, intended for disposal and replacement once full of accumulated ash. Others are designed to burn off the accumulated particulate either passively through the use of a catalyst or by active means such as a fuel burner which heats the filter to soot combustion temperatures. This is accomplished by engine programming to run (when the filter is full) in a manner that elevates exhaust temperature or produces high amounts of NOx to oxidize the accumulated ash, or through other methods. This is known as "filter regeneration".

Cleaning is also required as part of periodic maintenance, and it must be done carefully to avoid damaging the filter. Failure of fuel injectors or turbochargers resulting in contamination of the filter with raw diesel or engine oil can also necessitate cleaning. The regeneration process occurs at road speeds higher than can generally be attained on city streets; vehicles driven exclusively at low speeds in urban traffic can require periodic trips at higher speeds to clean out the DPF. If the driver ignores the warning light and waits too long to operate the vehicle above 40 miles per hour (64 km/h), the DPF may not regenerate properly, and continued operation past that point may spoil the DPF completely so it must be replaced.

Some newer diesel engines, namely those installed in combination vehicles, can also perform what is called a Parked Regeneration, where the engine increases RPM to around 1400 while parked, to increase the temperature of the exhaust.

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Picture of Fergal Reamsbottom

Fergal Reamsbottom

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radiator300h.jpgThe radiator is a square or rectangular shaped metal box that fits in front of your engine.It draws in cooler ambient air from the outside to help cool the radiator fluid. A radiator is usually made out of a metal such as aluminium, or in some cases copper, that conducts heat very well. It includes a series of tubes and fins where the fluid passes through and is cooled by air drawn into the radiator.
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Radiator CapIf the Pressure in the radiator gets two high the radiator valve in the main radiator cap is opened and allows the excess fluid to flow in to the coolant reservoir,when the pressure is low atmospheric pressure opens the return valve to allow fluid to pass back into the cooling system

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Radiator Cooling Fan The radiator cooling fan is usually located directly behind the radiator itself. Its function is to pull air through the radiator when the engine is operating at slower speeds. It may be mechanical and driven by a belt, or it may be electric and controlled by the thermostat the fan used on this engine is a viscuos fan.
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thermostat300w.jpgThe thermostat detects your engines operating temperature. It is also designed to regulate the flow of coolant from your radiator to your engine. When your engine reaches a certain temperature (85o-90oC) the thermostat releases the flow of coolant and when the engine is cooler, it restricts it.

Thermostat closed and open

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The water pump is a gear pump this pushes the coolant through the radiator. The water pump provides the pressure that moves the coolant through the engine and radiator. It accomplishes this by using a specially designed blade called an impeller that resembles the propeller on a boat or a tiny water-wheel. Once the coolant is pushed past the water pump, it moves through hundreds of tiny passages built into all areas of the engine, where it pulls heat out of the metal parts of the engine. Once it has done its job, the heated coolant moves through the thermostat and back into the radiator.


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Please note, if you want to contact the main Training Centre in Baldoyle, you need to ring 01-8167400.


If you want to contact the CP Fitters' Section, you can Contact Us by email, admin@cpfitters.info, or by telephone: 00 353 1 8167543 This number gets you through to the CP Fitters' Section, Baldoyle Satellite Unit.

Our Address is : Construction Plant Fitters' Section, Unit 116, Grange Way, Baldoyle Industrial Estate, Baldoyle, Dublin D13 CA48.
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