Pay attention to the thickness of the cylinder head gasket. When a S195 diesel engine is repaired, the operator replaces the new cylinder liner and the new cylinder head gasket. After the cylinder head is installed, when the cylinder head nut is tightened, it does not reach the specified torque and a “click†sound is heard. After removing the cylinder head, it was found that the new cylinder liner broke from the upper shoulder. After inspection and analysis, when the operator replaced the cylinder pad, because there was no thick cylinder pad with copper skin, it was installed on the newly purchased thin asbestos cylinder pad. As a result, the above-mentioned fracture failure occurred. Body, crankshaft The lubricating oil of the three bearings and the bearing bushes must be matched with the small four-wheel tractors in the current rural area of ​​8.8 kW, and many of them are horizontal 195 diesel engines. For various reasons, after the replacement of the diesel engine, the lubricants of the engine body, crankshaft, and bearing shell sometimes fail to match each other, often resulting in failure of burning tiles. First, the crankshaft oil channel 1 three-hole crankshaft: Both the main journal and the connecting rod journal have a lubrication hole. 2 Two-hole crankshaft: The front main journal and the connecting rod journal each have a lubrication hole, and the rear main journal has no lubrication hole. Second, the crankshaft bearing the oil channel 1 outer ring groove crankshaft bearing: the outer circle with an annular groove oil. 2 Inner ring groove crankshaft bearing: The inner circle has an annular grooved oil passage. 3 double ring groove crankshaft bearing: inner and outer circles are provided with an annular grooved oil passage, also known as a universal crankshaft bearing. Third, the body of the oil on the body of the oil there are two forms, one is the front spindle bearing seat hole to the rear of the main bearing seat oil hole, the other is not. 4. Matching of oil, crankshaft and bearing bush Generally, when the front body main bearing seat hole has the oil passage to the rear main bearing seat hole, it is matched with the two-hole crankshaft and the outer ring groove crankshaft. Lubrication of the main journal at this time is the lubricating oil from the groove oil passage of the outer ring of the front main shaft, through the oil passage of the main body to the rear main bearing seat hole, and then enters along the outer annular groove of the rear main bearing bush. After the main shaft tile. If the body front main bearing seat hole does not have an oil passage to the rear main bearing seat hole, it is matched with the three-hole crankshaft and the inner ring groove crankshaft bearing. At this time, the lubrication between the rear main journal and the rear main bearing bush is carried out by the oil flow of the crankshaft itself. When there is no crankshaft bearing in accordance with the original model, a double-ring groove crankshaft bearing can be used. The universal type bearing bush has the function of the inner and outer ring groove crankshaft bearing bush. Fifth, the common cause of burning tile When the original machine is using the outer ring groove crankshaft bearing, the original machine must use a two-hole crankshaft. As mentioned before, the lubrication of the rear main bearing bush is performed by the lubricating oil from the original groove on the outer groove of the front main shaft, and then passed through the oil hole in the front main shaft pedestal to enter the oil passage of the engine body. If the replacement parts are repaired with inner ring grooves and crankshaft bushes are used instead, the front main shaft socket holes will be blocked and the oil passages will be blocked, and the rear main shaft will be burned out due to lack of oil. When it is imperative to use the inner ring groove crankshaft bearing instead of the outer ring groove crankshaft bearing tile, a diameter of 6-7 mm must be drilled at the oil passage hole of the main shaft bearing hole of the machine body in the groove grooves of the two main bearing rings respectively. Oil hole to ensure the smooth flow of lubricant. 6. Precautions for purchase of parts At present, there are many parts factories that produce crankshafts, bearings, and bodies. When purchasing parts, one must pay attention to product quality, and the second is to understand the lube oil of the machine before purchasing.
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