Ramsay, Son & Parker (Pty) Ltd

 
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DIY CUBBY COMPANION
Reducing engine wear

Engine wear is mainly caused by below-normal running temperature and ncorrect, or infrequent, servicing. When you start the engine for the first time in the morning the water, as well as the engine components, are at the temperature of their surroundings.

This means that the oil is thicker than normal and that the clearances in the engine are larger than their designed values. This increases the chance of metal-to-metal contact and also means that some of the water, which is a product of combustion, gets a chance to mix with the oil. The conditions are so unfavourable that it has been calculated that on a trip from Cape Town to Johannesburg, more than 90 per cent of the wear takes place during the first 10
minutes of the journey.

What can one do? Allow the engine to idle until it is at the working temperature? No, the modern engine responds best by being driven away immediately at a slower than normal pace until the water and oil are at their normal temperatures. This has the further advantage that the choke is used sparingly, decreasing the chance of raw fuel getting into the engine, as well as making sure that the gearbox and final drive also get a chance to warm up gently.

 
 

On the servicing side, regular changes of filters (air, oil and fuel) will prevent wear caused by dirt getting into the engine. However, it is very important to buy only reputable makes of filters, because South Africa has been inundated with third-rate automotive components, and some of these filters are so bad that they can develop a blockage and cause engine failure.

Driving habits can also affect engine wear. Habits such as applying full throttle on a cold engine, regularly revving into the red zone, and letting the engine idle for long periods are all harmful. On the other hand, cruising at any chosen speed in the highest gear does very little harm to the engine, because modern gear ratios will normally ensure that the engine cannot over-rev in top gear.

This graph shows that a filter's efficiency improves the longer it filters. It's important to change the cartridge at the correct (ie recommended) time and not too soon or too late.

 
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