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By A. Bonnick, D. Newbold

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When refitting the cylinder head, why is it necessary to tighten the bolts/nuts in the correct sequence? What would happen if this sequence was not followed? 7. Why is it necessary to have a gap between the valve stem and operating mechanism? What would happen if the engine was operated with no valve clearance? 8. Remove and refit a cylinder head from an engine, make out a job sheet and record any special tools used, faults found and safety procedures that were followed. Draw up an operations schedule for the task.

This reduces friction to a minimum resulting in minimum heat and therefore minimum wear (Fig. 42). Mixed friction This is friction between two materials with a good oil film which is not quite thick enough to prevent contact occurring between the metal surfaces. Here the metal itself can touch the surface of the Fig. 42 Points of fluid friction Engines and lubrication Fig. 43 Mixed friction occurs in this ball and roller bearing second metal for a short time but this is not long enough to produce much heat; therefore wear is limited.

10 Variable Valve timing Valve timing is normally a compromise in design that aims to achieve good performance across the operating speed range of the engine. 15. The period, at the piston top dead centre position, when both valves are open together, is known as valve overlap. It is normally fixed. However, early opening and late closing of the inlet valve has an unhelpful effect 26 A practical approach to motor vehicle engineering and maintenance on low engine speed emissions and design developments, such as variable valve timing, have been introduced to improve emissions and other aspects of engine performance.

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