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Codes for Theory Examinations:
Codes for Practical Examinations:
Note: When carrying out these calculations, measurements must be in basic SI units:
Bearings used extensively in the transmission systems of plant vehicles. These types of bearings are excellent for bearing both radial and axial loads. Because they can bear the axial loads in one direction only, they are often fitted in pairs, for example wheel bearings.
This is a type of pulley locking arrangement often found on small plant machinery.
The pulley consists of two parts, an inner part which is tapered and sits into to the outer part. The inside of the outer part is also tapered, and the outside of the outer part has the sheaves of the pulley
Contributors to this glossary entry: Lorcan McGivney and Ryan Owens, CP Fitters, January to May, 2012
Another name for the tappet is the cam follower (because it follows the contours of the camshaft).
Shown below is a variation on a tappet. In this case the tappet sits over the valve and spring assembly. The camshaft runs on top of this arrangement, and once again, the tappet follows the profile of the cam.
As part of those exams, as well as the practical work, you are also required to answer task related questions. These are questions your examiner will ask you about the topic being examined. For example, in the electrical practical exams, you can expect to be asked several questions about batteries, as well as other questions related to what you are doing.
Certain parameters that affect the operation of the engine are stored in the ECM. These prameters can be changed by the use of the EST. The tattletale logs the number of changes that have been made to the parameter. The tattletale is stored in the ECM.
Formerly in Greenogue Business Park
Apparently, as of August, 2011, this depot in Dublin is now closed. Ringing the 01 4019 300 number gets you through to Northern Ireland, where you can then ask for stores.
One contact in the stores there is Stephen Mullen in Belfast, his direct number is: 048 9084 4510
The Depot number in Belfast is: 048 9084 8371
NOTE: For Bomag Parts, you need to quote the 12 code number on plates mounted on the item of equipment.
Top Dead Centre: The instant at which the piston in an engine has reached its highest point within the cylinder. It is called "dead" centre, because the piston has finished its upwards movement, and stops (hence the use of the term "dead") before commencing its downward movement.
A point sometime before TDC is often used to set spark ignition (petrol engine) or diesel injection (diesel engine). For example, a petrol engine could be set to fire at 80 BTDC (Before Top Dead Centre), or a diesel engine could have injection set 150 BTDC.
Technicians who succesfully complete their National Craft Certificate (formerly the Senior Trade Certificate) and the Advanced Automotive Technological Certificate are awarded a Technicians Diploma and are entitled to use the title Tech. Dip.