By Allan Bonnick, Derek Newbold
This article covers all of the vital and well known not obligatory devices of the IMI Technical certificate and NVQ point 1 & 2 syllabus, from future health and safeguard rules to fault discovering and changing elements. totally up-to-date, it additionally has automobile upkeep techniques built-in all through, making it the vital first school room and workshop textual content for all scholars of motorcar engineering, apprentices and willing amateurs. The textual content is made obtainable to all degrees of skill via its transparent, logical process, very good illustrations and step by step improvement of thought and perform. there's information on getting ready portfolios of facts, and functional workouts are integrated to illustrate genuine workshop perform. *
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Extra resources for A practical approach to motor vehicle engineering and maintenance
The shaft then rotates freely, separated from the bearings by this thin film of oil. A correct bearing clearance is shown in Fig. 50. It is important that the bearings have the correct clearance. Too much will cause the oil to escape from the bearing without being able to create the required oil wedge; too little will restrict the oil from entering the bearing, causing metal-to-metal contact. In both cases wear will increase. The oil which is pressed out from the bearings is splashed around and forms an oil mist which lubricates the cylinder and piston (Fig.
This provides for balance of both crankshaft and flywheel together. Seals Oil seals (Fig. 35) are placed at each end of the crankshaft and camshaft to prevent the loss of oil between the shafts and their housings. Where the surfaces do not move, gaskets are used to ensure a water-, oil- and gas-tight seal, for example between the cylinder head and the cylinder block. 40 A practical approach to motor vehicle engineering and maintenance Fig. 35 Crankshaft oil seals Sump The bottom of the engine is enclosed by a sump which normally contains the engine oil.
It is important that only the correct grade of oil is used in a given vehicle and the information about that is given in the driver’s handbook or the workshop manual. In most modern engines multi-grade oils are recommended regardless of temperature. An SAE10 W/40 oil, for instance, can be used in most climates thus simplifying the selection of oil. It is important to know that the SAE grades only give information on the viscosity of the oil and not the quality. This can be found by making reference to the API (American Petroleum Institute) classification.