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From the valve guide working conditions can be seen, the valve guide material must be good heat dissipation, wear-resistant. 1. the tube material: generally is the choice of medium carbon steel, hardness 40 ~ 45HRC.
2.using relative to the cylinder head centerline in a V-shaped arrangement. This arrangement can make the middle of the cylinder head water cavity increase, strengthen the cooling, at the same time, can make the combustion chamber design more compact, valve head diameter increases, exhaust more smoothly, the intake of air more fully.
3.The valve guides must be selected with the right amount of interference. Too little interference will make the tube loose and leak oil into the combustion chamber; too much interference will make the cylinder head expand and crack when pressed into the tube. A. Heat the cylinder head evenly to 80ºC~100ºC and cool the valve guide to - 40ºC. B. Quickly install the punch bar and press the guide into the guide hole on the cylinder head. When the upper end of the guide tube is exposed to the inner surface of the cylinder head basin groove, it must be protruded according to the factory specified value. Do not extend too much, otherwise it will affect the valve spring work. When the length of the guide tube is certain, the upper end of the guide tube is too short, which means the lower end of the guide tube may reach into the air passage, which will affect the intake and exhaust.C. After the guide tube is pressed, the inner hole is reamed according to the regulations, and the roughness is Ral.6~0.8μm. The roughness should not be high because there is no lubrication between the guide tube and the valve. In order to prevent oil from leaking into the combustion chamber from the gap between the guide hole and the valve, a valve oil seal should be installed at the upper end of the conduit.
1. Our packing uses export wooden cases, plastic boxes, cartons or pallets. All the package are very strong, the wooden box is firmly bound, the package is covered with a waterproof film to prevent water or damage during transportation.Before packing, we can also stick corresponding labels and shipping marks according to your needs. All our goods are well packed.
Jinan Carman International Trade Co., Ltd. was established in 2013. Its main business is the export of truck parts to the Russian,Europe and Southeast Asia market.like shacman ,sinoturk ,faw weichai cummins ZF ,cummins XCMG LGMG JCB .DCEC,isuzu caterpiller .komatsu yanmar spare parts .The company has its own warehouse in Jinan with an area of 2000 square meters.and have a large stock .And Ability to quickly collect and deliver goods.Our main business is SINOTRUK, shacman , FAW, Cummins and all kinds of construction machinery accessories. We always adhere to the quality of products as the core, to serve customers as the task.Hope to be able to better communicate with friends from all over the world, and through this communication, promote the development of cultural exchanges and economic exchanges between the two sides.
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