Answer
If the tappets are noisy they may be adjustable, however the majority of engines in current production use 'hydraulic' tappets that require no adjustment. The fact that they are noisy at least implies that the gaps are too large and not too tight. A tight tappet is more of a problem as this can burn out the valves. It should be quite safe to leave the adjustments until the next service is due.
6. Is there any problem with coasting in neutral in an automatic when coming to a stop at a traffic light? I do this often - not to save on fuel but to help reduce the speed of the vehicle, since less braking effort is needed to bring the vehicle to a stop when the automatic transmission is in neutral.
Answer:
Coasting in an automatic is not an accepted practice, as this will lead to premature failure of the gearbox. This is why a vehicle fitted with an automatic gearbox should not be towed.
7. I know 1.6mm is the legal minimum limit for tyre depth but what is the optimum depth before performance of a tyre is affected?
Answer:
1.6mm is the legal limit but it would be better to replace the tyres before they get right down to the minimum level to ensure good traction and grip are maintained. This is particularly advisable in wet, frosty or icy conditions.
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