By Allan Bonnick, Derek Newbold
This article covers the entire essential and well known not obligatory devices of the IMI Technical certificate and NVQ point 1 & 2 syllabus, from overall healthiness and defense rules to fault discovering and changing parts. totally up to date, it additionally has motor vehicle upkeep techniques built-in all through, making it the quintessential first school room and workshop textual content for all scholars of motorcar engineering, apprentices and prepared amateurs. The textual content is made available to all degrees of skill via its transparent, logical strategy, very good illustrations and step by step improvement of concept and perform. there's advice on getting ready portfolios of facts, and useful routines are incorporated to illustrate real workshop perform. *
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Extra info for A practical approach to motor vehicle engineering and maintenance
29 shows an example of the shape of the combustion chamber being included in the piston crown. g. Solid skirt used in both CI and SI high speed engines, where heavy loadings may be placed on the piston; . Split skirt where small clearances are used to reduce piston slap when the engine is cold; . Slipper type which is used to reduce the weight of the piston by cutting away the bottom of the non-thrust sides of the piston skirt; at the same time it reduces the area in contact with the cylinder wall, and also allows for a reduction in the overall height of the engine as BDC is now closer to the crankshaft.
In addition it is always preferable for any engine to run on low-viscosity oil during the starting period when the engine is cold, and on high-viscosity oil when the engine is hot and fully loaded. For practical reasons it is not possible to use a low-viscosity oil for starting and then change to a high-viscosity oil when the engine is hot. Therefore, we need an oil which is thin enough at low temperatures, but will also have a sufficiently high viscosity at high temperatures – that is a multi-viscosity or multi-grade oil.
An early opening of the exhaust valves initiates (begins) thorough scavenging of the exhaust gases just before the air inlet ports are uncovered by the piston. The exhaust valves are timed to close just before the air inlet ports to ensure the cylinder is fully charged with fresh air (Fig. 16). Learning task 1. Find information for a sports engine and draw a valve-timing diagram. 2. What would be the result of fitting a cam belt one tooth out? Valve timing: lead, lag and overlap The opening and closing of the valves is pre-set by the position and shape of the cam lobes on the camshaft.
A practical approach to motor vehicle engineering and maintenance by Allan Bonnick, Derek Newbold