1 Butter when installing the cylinder head gasket
some mechanic to install the cylinder head gasket, like mat coated with a layer of butter in the cylinder, and that this would increase the tightness of the engine. As everyone knows, this is not only useless, but harmful. Well known, cylinder pad is a car engine block and cylinder head seal between materials, it is not only demanding high temperature and high pressure gas sealed within the cylinder, and must be sealed throughout the cylinder head and cylinder body has a certain pressure and flow rate of cooling water and oil, and thus in the disassembly of cylinder pad, paying particular attention to the quality of the sealing.
Cylinder pad butter, when the cylinder head bolt tightening, part of the butter will be squeezed into the cylinder waterways and oil passages between the cylinder head gasket butter work in the cylinder due to the high temperature, part of it will flow into the cylinder combustion the other part will be firing the coke deposit on the surface of cylinder block and cylinder head combination, under high pressure and temperature effects, easily cylinder pad breakdown or burn, causing the engine to leak. Do not smear the butter when installing the cylinder pad.
2. Diesel vehicles use gasoline car engine oil
Oil gasoline engine oil and engine oil points. Gasoline and diesel engines, it is also at a high temperature, high pressure, high-speed and high load conditions, but is still a large difference. Diesel engine compression ratio is more than 2 times that of gasoline, its main parts subject to high temperature and pressure impact than the gasoline engine is much larger, and thus the production of materials in some parts is different. For example, the gasoline engine main bearing and connecting rod bearings available material is relatively soft, good corrosion resistance Babbitt to make diesel engine bearing lead bronze or lead alloy and high-performance materials must be used to make, but the corrosion of these materials performance is poor. To this end, in the diesel oil refining process, the more corrosion agent, generated in the bearing surface in order to use a layer of protective film to reduce the bearing corrosion, and improve the wear resistance. Gasoline oil no such corrosion agent, if added to diesel engines, bearing in use, it is easy to spot, Ma Hang, even into the film peeling off the adverse consequences of oil will soon become dirty, and the bush-burning axle accidents. In addition, the diesel fuel sulfur content than gasoline, harmful substances in the combustion process, the formation of sulfuric acid or sulfurous acid, a fleeing into the sump together with the high-temperature high-pressure exhaust gas to accelerate the oxidation and deterioration of the oil, so the engine oil refining manufacturing process need to add some anti-oxidation additives, so that the oil is alkaline. If there is acid gas fleeing, may play in role does not result in the oil too quickly oxidized. Gasoline engine oil do not add this additive, because it was neutral, if used in diesel engines, metamorphic failure due to corrosion of the acid gases quickly. So do not use gasoline engine oil filling diesel.



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