Dongfeng Citroen C5 sedan EW12A engine crankshaft bearing selection scheme

Dongfeng Citroen C5 sedan EW12A engine crankshaft bearing 2020 - optional solution 02 - 15 yellow fire ( Fujian ship transportation vocational college Ms. ) Modern automobile engine crankshaft main bearing and connecting rod bearing generally used thin multilayer alloy ( 3 ~ 5 layers) The sliding bearing. Bearing wear and tear form, alloy fatigue spalling, bearing fatigue contraction and stick bite dead. Fitting clearance of bearing and shaft neck if beyond technical standard, the crankshaft bearing damping weakens of lubricating oil flows, can make the oil duct pressure drops, may disturb the normal lubrication bearing, coupled with the impact load, the bearing fatigue, cause adhesion bite dead and eventually lose the ability to work within the engine. Modern automobile engine crankshaft bearing repair is characterized by direct matching, don't shave, don't padded. This article will take the dongfeng Citroen C5 sedan EW12A engine as an example, introduce the main bearing of crankshaft and connecting rod bearing matching method. A, the crankshaft bearing matching method because of the crankshaft journal and bearing will exist in the process of machining error, to facilitate the bearing selection and reduce error, dongfeng Citroen C5 sedan EW12A engine to a fixed bearing, matching the other side of the bearing, the method of adjusting the cumulative error on the side. 1. Log in first Citroen Service network, online to find the model of the crankshaft main bearing upper bearing ( Close to the cylinder body side) Number of accessories, and then select the spare parts, as shown in figure 1. To find out in the same way a connecting rod bearing half bearing ( Connecting rod journal close to the ontology of the half bearing) Number of accessories, as shown in figure 2. 2. Main bearing of crankshaft bearing matching method in the second half. As shown in figure 3, the abscissa for character code on the cylinder block, ordinate near the crankshaft timing gear side character code. Location as shown in figure 4, figure 5. Example: on cylinder body character code for: CEDDB, crankshaft timing gear side character code for EFHFC balance block, the cylinder 2 main bearing of crankshaft bearing should choose green bearing in the second half. As shown in figure 3. 3. Connecting rod bearing matching method in the second half. As shown in figure 6, the character code on the abscissa of the big end, ordinate near the flywheel side for crankshaft balance piece on character code. Location as shown in figure 7 and figure 8. Example: near the crankshaft flywheel side balance block character code for: GDAB, the character code in the big end is: D19L, is 4 cylinder connecting rod bearing half bearing should choose green bearing. As shown in figure 6. Tags or two, no letter after use of the engine crankshaft bearing replacement method if cylinder crankshaft and connecting rod tag is not clear, or after repair, crankshaft, according to the crankshaft journal and bearing clearance to choose the second half of the bearings at this point, the matching of the program is the first detection of crankshaft journal, on the basis of choosing a certain level of bearing, the installation and measurement of bearing radial clearance, according to the size of the gap adjustment again, until the bearing clearance required technical parameters. If there is no accurate way of measuring, then install the thinnest of the second half of the bearing, this only as an emergency treatment, may lead to abnormal engine noise. Source: the automobile service 2016, 03