共查询到20条相似文献,搜索用时 180 毫秒
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故障现象: 此车装配汽油2.0T(涡轮增压)发动机。因运行中水壶漏水导致发动机水温高,冲缸垫,同时此发动机有烧机油现象。拆下检查,缸盖变形超出维修极限(0.10mm),于是更换缸盖和活塞、活塞环及附件。 相似文献
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澳大利亚墨尔本的斯凯尔佐汽车研究公司已研制出一种新型的车用发动机——连续式变冲程发动机,简称CVS。这种五缸变排量斜盘式发动机开动后噪声很小,手触发动机缸盖感觉不出振动。 相似文献
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<正>故障现象:一辆2009款奥迪A4L,发动机型号CCUA,1.8TFSI 。发动机异响及发动机故障灯亮,缸盖内气门室盖处"嗒嗒"响声和正时壳处有"赫拉赫拉"的响声。踩制动时偏硬。故障诊断:接车后跟客户沟通得知,该车因为事故在别家维修厂修过,揭过缸盖。通过本站维修技师仔细及听诊,确实在缸盖内气门室盖处 相似文献
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故障现象一辆2008年出厂的长安铃木羚羊手动挡轿车(采用B4J发动机),累计行驶里程约为13.5万km,出现发动机故障灯常亮,急加速发动机熄火的故障现象。故障诊断经过了解得知,上述故障已经出现一段时间了,以前是发动机熄火后,还可以再起动着机。该故障出现后曾在多家维修厂维修过,清洗过油路,更换过进气歧管绝对压力传感器、凸轮轴位置传感器,拆检过气缸盖等,但故障一直未能彻底排除。 相似文献
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表面或内部泄漏是缸体、缸盖最常见的故障之一。泄漏产生的原因有砂眼、气孔、裂纹等,而确定泄漏点、并将故障件维修处理是此类问题的关键。通常较大的砂眼或气孔(直径1mm以上)、裂纹肉眼或者借助漏液痕迹,都能找到相应的泄漏点,而较小的泄漏点、且出现在缸孔内部、缸盖燃烧室用常规的办法很难确定,有时需要用到专用的检测设备,而缸孔内部的细小漏点用专用泄漏检测设备能识别零件泄漏测试不合格,但无法锁定泄漏点的位置。本文将通过一个故障案例阐述一种特别简易且适合查找发动机内部泄漏的漏点检测方式—即简易法漏点检测。 相似文献
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《JSAE Review》2002,23(1):15-20
Experiments on a small, one-cylinder high-speed diesel engine were performed by changing the temperature of cooling water and also by changing the material and configuration of the cylinder head gaskets. Three kinds of cylinder head gaskets were made. The temperature was abruptly changed and the temperatures at several points of the cylinder head gasket and its peripheral region, the relative displacement between cylinder head and cylinder block, the loads of the cylinder head bolts, the indicator diagram, the pressure of gasket surface and combustion gas leakage were measured. The sealing characteristics in the transient state and the steady state of the cooling water temperature were investigated from an experimental standpoint. The effect of the temperature differences between the cylinder head, cylinder block and head bolts on the loads of the head bolts and the relative displacement between the cylinder head and cylinder block were observed for the test gaskets. 相似文献
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Valve seats press-fitted in the cylinder head function to hold exhaust gas inside the ignition chamber and to transfer heat to the coolant moving in the water jacket of the head. The press-fitting of the valve seats to the head at ambient temperature has been widely spread out due to its many advantages over pressing with frozen valve seats or with a heated head. The benefits include lower equipment costs, lower running costs, and fewer installation faults during the press-fitting. Nevertheless, a systematic approach for pressing at ambient temperature (ATP; ambient temperature press-fitting) has not been studied and analyzed to date. A technique to check the reliability of the press-fitting by measuring hoop strain inside the valve seat and the FEM procedure to simulate ATP is developed in this study. The FEM procedure of ATP developed here exhibits a concurrence with experimental results. Utilizing the DOE (Design of Experiments) technique, we determined the effects of various geometric parameters and the optimal shapes of the valve seat and cylinder head. The optimal shapes have been successfully applied in an actual engine and varified in a running-engine test. 相似文献
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