Question 3
(a) State the purpose of fitting an interlock device in a gearbox.
(b) List the three methods of supporting the axle shaft.
(c) List two types of universal joints used on motor vehicles.
(d) State four faults that may arise on semi-elliptic leaf springs.
Observation
Most of the candidates who attempted this question did well in parts (a) and (d) of the question. However parts (b) and (c) were poorly answered. The required responses to parts (b) and (c) are:
(b) Three methods of supporting the axle shafts to the rear axle are:
- Fully floating;
- Semi-floating or non-floating;
- Three quarter floating.
(c) Types of universal joints are:
- Hookes, hardy spicer or cross-type coupling;
- Layrub coupling or bush type, metalastik rubber coupling;
- Retroflex coupling;
- Fabric coupling;
- Constant-velocity joint;
- Viscous coupling;
- Doughnut coupling.