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Car abnormal sound big net rod connecting rod bearing sweeping
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1) There is no significant movement when the engine is running at idle speed; and the “giggle†sound is announced at medium and high speed (announced by the crankcase)
2) The sound is louder and louder when the throttle is released after the fuel is added.
3) There is no significant change after the temperature rises. When the load is added, the movement will increase.
4) The movement is slower and shorter than the crankshaft bearing.
reason:
1) The connecting rod bearing and the journal are excessively worn; the radial clearance is too large.
2) The connecting rod bearing cover fastening bolt is loose.
3) The connecting rod bearing alloy is ablated or dropped.
4) The connecting rod journal is out of round.
5) The connecting rod bearing and bearing housing are relatively transformed.
Confirmed diagnosis:
1) The engine speed is clear from the idle speed to the medium speed; the speed is increased; the sound is more outstanding;
2) Perform a fire test on a cylinder; the sound is weakened or not seen; the rod bearing is ringing for the cylinder.
3) Regardless of the speed and temperature, the motion is declared static; and the engine has oscillation; the fire test is not changed; the alloy of the connecting rod bearing is ablated.
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Industrial applications editor broadcast
Whetstone sintered corundum (ruby) : A kind of microcrystalline corundum product sintered at high temperature. It has a compact and delicate structure and high hardness and strength.
The products are rosy red. The products are small grinding wheel type whetstone, standard type whetstone and grinding head type whetstone. When grinding the workpiece, it can maintain sharp edge and stable geometry for a long time.
It is suitable for forming and grinding of instrument industry, precision parts, micro cutting tools, tools and precision abrasive tools, etc. The precision surface roughness of machining can reach about 0.05μm.
Product SPECIFICATIONS: flat sand wheel whetstone with diameter less than 100 for small grinding wheel type, whetstone with various geometric shapes less than 200*50*25 for standard type, whetstone with diameter less than 25 for grinding head type.
Grinding method
About diamond grinding paste, particle size from W40 to W0.5. W40 is the coarsest, with a large amount of grinding, and W0.5 is the smallest. It is used for polishing, and it does not anneal, and it can also grind the hard knife.
Method of use:
The coarse W40 abrasive paste applied to borotartar can accelerate and increase the grinding amount without annealing.
Then, AFTER the rough grinding paste on the knife is cleaned, W0.5 grinding paste is applied to the ruby or natural jade for polishing, and the effect thrown out is a mirror.
Green silicon carbide, white corundum, brown corundum of these three kinds of whetstone hardness is not enough, coupled with a little coarse particle size, easy to grind out the cross, and the other three kinds of whetstone in polishing, grinding will not annealing.
If the particle size is greater than 1000, there is no difference. It mainly depends on the grinding paste used. When the grinding paste of W1.5 is applied to the ruby with 1000 mesh, its grinding effect is the effect of the grinding paste of W1.5, that is, the effect of the whetstone with 2500 particle size
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