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Cummins diesel engine main crankshaft upper and lower bushes


Detailed Description:

Cummins diesel engine main crankshaft upper and lower tile physical maps and parameter models are for reference only: for specific price models, please contact our sales online customer service,

Rixing Power Technology direct sales Cummins KTA19-G2, KTA19-G3, KTA19-G4, KTAA19-G6A, KTA19-G8, NTA855-G1, NTA855-G2, NTA855-G3, NTA855-G2A, NTA855-G4, NT855- GA, KTA38-G2, KTA38-G3, KTA38-G5, KTA50-G1, KTA50-G2, KTA50-G3, KTA50-G9A, KTA50-GS8, MTA11-G3, MTAA11-G3, 6CTA8.3-G2, 6CTAA8. 3G2, 6LTAA8.9G2, 6BTAA5.9G2, 6BTA5.9G2, 6BT5.9G2, 4BTA3.9G2, 4BT3.9G2, 4B3.9G2, VTA28G5, VTA28G6, QSZ13-G2, QSZ13-G3, QSK38-G5, QSL19G5, QSX15G6 QSX15G8, QSK23G3, QST30G3, QST30G4, QSK60G3, QSK60G4, QSK19G3; QSK78 Dongfeng Cummins diesel engine crankshaft upper and lower bushes, Chongqing Cummins diesel engine crankshaft upper and lower bushes, American Cummins diesel engine crankshaft upper and lower bushes,

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Prevention and Treatment of Cummins Diesel Engine Crankshaft and Spindle Bush Ablation

There is sliding friction between the Cummins diesel crankshaft and the bearing bush. The root cause of crankshaft bearing bush wear and ablation is poor lubrication conditions, semi-dry friction or dry friction, which causes the surface of the bearing shell to be abraded, the protective layer to fall off, and the surface high temperature to damage and melt the wear-resistant alloy layer, and the bearing shell to be ablated. The main reasons for the ablation of the crankshaft and the bearing pads are: incorrect lubricant brand or unqualified quality; insufficient oil capacity, low oil pressure of the lubrication system, and a good lubricant film cannot be formed between the crankshaft journal and the bearing pad; the thickness difference of the bearing pad itself exceeds the limit ; The bearing pad compression margin is not enough; the dimensional accuracy, shape and position tolerances of the crankshaft or cylinder do not meet the requirements, and the machine body deforms; the crankshaft main journal, connecting rod journal shape tolerances exceed the specified values; crankshaft main journal, connecting rod journal The surface roughness does not meet the requirements; the dynamic balance of the crankshaft, flywheel, and clutch fails to meet the requirements; the filter failure of the oil filter system caused the filter failure; improper maintenance of the diesel engine, poor assembly cleanliness; insufficient cooling strength of the diesel engine cooling system; low temperature startup; Long-term heavy load operation.

(1) Strictly monitor the coaxiality and roundness of the main bearing hole of Cummins diesel engine block

The coaxiality of the main bearing hole of the body and the runout of the crankshaft must be accurately measured to select the thickness of the bearing shell so that the oil gap is consistent at each axis position. For diesel engines that have been subjected to rubbing, "speeding", etc., the coaxiality of the main bearing hole of the body must be tested before assembly. The total length of the ductile iron crankshaft is not greater than 0.14mm, and the total length of the steel crankshaft is not greater than 0.12mm. The roundness and cylindricality of the main bearing hole are also required. If it exceeds the limit, it is disabled, if it is within the limit, it is ground by grinding

(2) Improve the quality of bearing maintenance and assembly and strictly control the qualification rate of the connecting rod on the machine

Improve the quality of the hinge of the bearing pad, ensure that the back of the bearing pad is smooth and free of spots, and the positioning bumps are intact; its own spring opening is 0.5 ~ 1.5mm, which can ensure that the bearing pad is closely fitted with the bearing seat hole by its own elastic force after assembly; The old connecting rods always require the measurement of their parallelism and twisting to prevent improper installation and uneven or non-compliant torque of the bearing pad bolts, resulting in bending deformation and stress concentration, leading to premature damage to the bearing pads.

(3) Reasonable selection and filling of lubricants

The specified grade of Cummins lubricating oil is used to determine the quality level of the lubricating oil according to the strengthening factor of the diesel engine. Then determine the viscosity grade of the lubricant according to the temperature. Regularly change the lubricating oil and filter. There may be instruments to perform quality analysis on the lubricating oil to determine whether it needs to be replaced. Oil replacement should follow the "five set" and "three filtration" principles of oil change to avoid mixing with other oil or moisture and other impurities to ensure the quantity and quality of oil. In the process of use, a lubricant with a small surface tension of the oil film should be selected to reduce the impact of the oil flow when the formed bubbles collapse, which can effectively prevent the bearing cavity from eroding; the viscosity grade of the lubricant cannot be increased arbitrarily to avoid increasing the bearing Coking tendency

(4) Regularly check whether the lubricant is leaking

Check before the machine starts or after 5 minutes of shutdown. Fully check the amount of oil once; observe whether the oil pressure gauge reading meets the requirements; pay attention to whether the oil drips; regularly replace the coarse and fine filter elements of the oil to keep the oil radiator clean; replace damaged parts in a timely manner; use reliable quality and meet specifications during overhaul When installing the bearing bush, the fastening bolts should reach the specified torque, and the crankshaft should be assembled according to the design requirements. Also pay attention to cleaning the crankshaft oil passage.

(5) Regularly check the cooling system

Remove scale from the pipeline. Check that the coolant in the water radiator is sufficient. Check whether the tension of the water pump tape is sufficient, whether the water pump bearings and impellers are damaged, etc., if they are damaged, they should be replaced in time. Check whether the thermostat has failed. The failure of the thermostat will cause the diesel engine to have only a small cycle of cooling, and the coolant temperature will be too high to burn the tiles. Check whether the water radiator is leaking, whether the fan tape is slipping, and whether the blade is deformed.

(6) Correct use and maintenance of diesel engines

When installing the bearing bush, the journal and the working surface of the bearing bush should be coated with a specified grade of clean engine oil. After the bearing bush is installed, the fuel switch should be turned off before the initial start. In winter, in addition to strictly controlling the starting temperature, the starting fuel supply time should be extended to ensure that the oil reaches the friction pairs of the diesel engine and minimize the friction when the diesel engine starts. Mixed friction of the pair. When the pressure difference between the front and rear of the oil filter reaches 0.8 MPa, it should be replaced.

Keep the oil filter and crankcase ventilation device clean and strengthen the maintenance, and replace the filter element in time according to the instructions; ensure that the diesel engine cooling system works normally to prevent the water radiator from "opening the pot"; use the correct fuel and adjust the gas distribution phase accurately to prevent the diesel engine Abnormal combustion; check and adjust the technical conditions of crankshaft and bearings in time.

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