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Due to the weight of the driving gear of the oil pump and the radial thrust generated when the driven gear meshes, the shaft and the bushing hole are easily eccentricized and the gap is increased. Therefore, oil leaks due to increased clearance at work, reducing the amount of oil supply.
Drive shaft and bushing wear, you can repair journals or repair bushing method to restore coordination gap. In the minor wear of the journal, simply press the old sleeve put on the new sleeve, and the shaft can not be repaired, so with the gap can be restored to the allowable range. In the shaft and bushing wear are very serious, with a large increase in the gap, not only to replace the bushing, and the shaft also applies chrome or vibration welding to increase the diameter, and then grinding to the standard size to restore the journal and Bushing requirements.
2, pump housing cavity and gear wear repair
Pump housing cavity and gear wear, a great impact on the amount of pump oil. When the shaft and the bush or shaft hole wear serious, work in the tooth top and the pump chamber cavity surface will have an undivided contact. And because the pressure of the oil chamber is higher than that of the oil chamber, under the action of pressure difference, there is more contact between the tooth top and the oil inlet chamber of the pump housing. As a result, the cavity of the pump housing is more worn there, Top clearance increases. As a result, the pressure difference between the oil pump inlet and outlet oil chambers is reduced, and the effect of scraping oil and pressure oil on the gear teeth is reduced, resulting in a decrease of the oil supply pressure and a decrease of pump oil. The pump chamber cavity wear generally adopt lumen inlay method to be repaired.
Secondly, due to the gear tooth wear in the direction of tooth thickness, so that the main and driven gear meshing gap increases. Its wear characteristics are unilateral heavier wear, so the gear can be turned 180 degrees use.
3, gear end face and pump cover repair after wear
There is a certain clearance between gear end face and pump cover plane plane, which means the end face clearance. Work wear and tear on the contact surface between the gear end face and the pump cover plane will increase the gap of this end face, when the limit is exceeded, the amount of pump oil will have a significant impact.
When the gear end wear, the end surface can be polished, and then grind oil pump housing decomposition surface to ensure that the pump end clearance in the required range.
Diesel engine gear oil pump repair points after wear
1, diesel gear oil pump drive shaft and bushing wear repair