Ordinary level 2026 South West mock mechanical technology guide
Ordinary level 2026 South West mock mechanical technology guide
You are on internship at the “AFRIC AUTO GARAGE”. One of the customers Mr. HANAG FRU, owner of a
FORD FOCUS 1.8L ZETEC-E 16V Ghia vehicle with gasoline injection which he uses as his personal car, comes
to the garage and complains about mechanical breakdowns on his vehicle.
SECTION I: MATERIAL TECHNOLOGY / 06 marks
I.1- The manager of the garage solicits your knowledge of materials to help Mr. HANAG FRU to identify the
material used in manufacturing certain worn parts of his engine which requires repair. For this, he asks you to
| name two (02) parts of this FORD FOCUS engine which are made of stainless steel. | (0.5mark x 2 = 1 mark) | ||
| – Exhaust system parts; | – hose clamps; | – Seat belt spring; | – fuel tank. |
| I.2- Among the parts mentioned above, there is one whose main constituents and their respective contents are: Carbon | |||
| (0.02%), Chromium (18%) and Nickel (9%). I.2.1- Specify the designation of this steel. |
(1 mark) |
2 C N 4.5 – 2.25
| I.2.2- Explain and justify if it is a low or high alloy steel. Low alloy steel. Because of its low percentage of carbon. |
(1 mark) |
I.3- To find out if you can differentiate between certain metals and plastics, your manager of the garage, asks you to
name two (02) parts of the vehicle that are made of plastic. (0.5mark x 2 = 1 mark)
– Expansion tank; – Chairs; – Dashboard; – Engine cover; – Trim panel; – Door handles.
I.4- Complete the table below by indicating the name and symbol of the composite materials found there. (2 marks)
| Name of composite material (0.5mark x 2) | Standardized designation (0.5mark x 2) |
| Polystyrene | PS C8H8 |
| Polyvinyl chloride | PVC |
| Polyethylene | PE C2H4 |
| Polyamide | PA |
| SECTION II: ENGINE TECHNOLOGY II.1- TROUBLESHOOTING |
/ 27 marks | (7.5 marks) |
| You are asked by the manager of the garage to carry out maintenance operations on Mr. HANAG FRU vehicle, | ||
| having the following operation irregularities: | ||
| • | Loss of engine power; |
• Excessive engine heating.
II.1.1- Complete the table below by giving each operating irregularity a possible cause and a solution. (3 marks)
| Operation irregularities |
Possible causes (0.5mark x 4) |
Possible solutions (0.25mark x 4) |
| Loss of engine power |
1-Worn piston ring; – Faulty fuel pump |
1- Replace; – Replace |
| 2- Worn out value guide | 2- Replace | |
| Excessive engine heating |
1- Less water; – Low oil level |
1- Add cooling water; – Add oil |
| 2- Wrong ignition timing | 2- Adjust ignition timing |
II.1.2- After diagnosing your customer’s engine, you suspect a loss of compression. Briefly describe the procedure
for checking engine compression using a pressure gauge. (2.5 marks)
– The spark plugs are removed; – The pressure gauge is screwed into the spark plug hole;
– The engine is rotated by hand or by the starter motor and the highest reading recorded from the pressure
gauge
