First, the wear characteristics of the plunger coupling, identification and repair 1, the wear characteristics of the plunger, even the wear of the plunger coupling, the main focus on the plunger head, the beam at the stop for the edge and the plunger into Back to the hole at. (1) wear characteristics of the plunger head Here wear the largest in the contact surface with a shallow upper and lower, coarse rough under the small groove marks wear milky white, especially in the light of the obvious. The maximum depth of groove marks up to 0.023-0.025 mm, the maximum width of 4-5 mm, a length of about 10 mm. (2 plunger head wear characteristics of the beam where the wear than the plunger head is small, mostly comb-shaped deep furrows, the same on the deep under the light, rough on the fine. (3) Plunger The wear characteristics of the stopping edge decrease gradually from the upper edge of the chute upward, the wear width is about 5 mm, milky white, while the edge of the stopping edge is blunt and blunt. (4) The wear characteristics of the lower shoulder of the plunger Wear here is very small, only short circumference on the shoulder circumference fine lines. (5) The wear characteristics of the plunger sleeve wear and tear mainly in the back near the oil hole, Of the wear site is located along the centerline of the hole and the upper wear extends about 6-7 mm upward from the upper edge of the hole to about 0.024-0.027 mm deep and the lower portion extends downwardly about 4.5 mm from the lower edge of the hole to a depth of about 0.015- 0.017 mm with a wear width approximately larger than the hole diameter The wear on the surface near the oil return hole is mainly on the left, 2-2.5 mm wide, 2-3 mm upward, 4-5 mm downward, with minimal wear on the right side of the hole. 2, the identification of the plunger coupling For the identification of the plunger coupling, the first is to use visual inspection Line general inspection, to see whether there are obvious defects, qualified or can not be identified, and then further identified by the test (1) visual identification with the naked eye to see the head of the plunger, stop around the edge or plunger oil Hole around, due to wear and milky white, scratch with a clear sense of nails, plunger or sets of rust, cracks, the top of the plunger or stop for a flake off, with one of the above defects, the plunger is scrapped . (2) with a simple vacuum identification with the right index finger cover the top of the plunger hole, the left hand will slowly pull out the plunger, then the right index finger should feel suction, when pulled about the plunger length of 2 / 5, quickly release the plunger, then the plunger quickly returned to its original position under the action of vacuum suction; that the plunger can continue to use, or should be replaced or to be repaired. (3) sealing test Identification Available injector test device, the plunger into the fuel injection injection pump body, into the oil valve seat and other parts, not installed out of the valve and the valve spring, tighten the outlet valve seat, the spray Oil pump valve seat tight end connected to the injector tester high pressure tubing Head, the plunger at the maximum fuel supply position, pressure injector tester hand lever, the oil pressure rose to 22540 kPa, stop pumping oil, measured from 19600 kPa to 9800 kPa oil pressure required Time, the value should be 16-29 seconds, otherwise, that is unqualified 3, the repair of the plunger coupling (1) plunger sleeve uneven surface can be used above the particle size of 600 grit paste coated in thick glass, grinding Grinding the plunger sleeve and the glass plate should be kept vertical, light and uniform force, while rotating, while moving, and continue to change the direction of rotation, grinding to the smooth end without scoring. (2) plunger in the column Plug block block is generally common in the new replacement of the plunger, the plunger guide can be coated with oil and plunger sleeve for mutual research.If the tightness is too large, should be coated with polishing research. Grinding can be used to drill or hand drill to hold the plunger, hold the plunger sleeve with the right hand to move back and forth. For the top of the plunger touching the pin, you can use a fine size of 800 stone, coated with oil, the plunger tilted about 30 degrees, gently turning the plug to remove burrs. (3) For severe wear of the plunger coupling, should be replaced with new parts. Second, the wear characteristics of oil valve coupling parts, identification and repair 1, the wear characteristics of the oil valve coupling parts Outlet valve wear parts, mainly in the sealing cone, vacuum ring and guide parts. (1) wear characteristics of the sealing cone wear larger here, the seat ring seal ring width increases, the finish decreased; in the valve cone there is a ring groove, the depth of about 0.05 mm. (2) wear characteristics of decompression zone wear here is also larger, the decompression ring after wear tapered, up and down small; all over the surface of the cylindrical groove marks, the shallow depth; The lower edge is rounded due to wear. (3) wear characteristics of the guide surface where wear less wear after the upper part of the lower part of the larger, in the oil valve seat and the valve seat decompression ring with the guide part also wear. 2, the identification of the valve (1) general identification with the naked eye observation, if the valve has one of the following defects, it can no longer be used. ①decompression ring with serious signs of wear, milky white axial scratches, scratches with a clear sense of nails or decompression ring with the axial notch on the circumference of the intensive to see the original surface finish. ② seal conical surface wear too much, seal ring is too wide or in the seal ring with a collapse. ③ out of the valve and valve seat rust, or metal peeling and deep abrasive scotch. ④ out of the valve seat under the plane when a serious rust. ⑤ oil valve seat sealing conical surface has obvious groove marks, scratch with a nail feeling. (2) a simple test of the sealing properties of the valve seal ①a simple test of the sealing cone Identification with a thumb and the middle finger holding the valve seat, with the index finger will be pressed on the valve in the valve seat, mouth out of oil Valve seat under the plane of the hole, and moved to the lips, if the lips can be sucked, indicating good sealing performance. You can also put the valve assembly into the pump body, without a plunger, from the high-pressure tubing joints through 294-490 kPa compressed air inspection. If not leak, indicating good sealing performance, or repair or replacement of new parts. ② decompression ring with a simple seal performance test identified with a thumb against the hole under the valve seat, the valve will be placed in the valve seat, gently press down with the index finger, when the pressure zone into the seat ring When, feel the upward rebound of compressed air. When you release the index finger, the valve can bounce up, then said. Ming vacuum ring and the valve seat hole of a good seal, otherwise it is unqualified. For newly replaced oil valve parts, but also for sliding test. Will be soaked in diesel oil out of the valve coupling parts removed, hold the valve seat to keep it in the vertical position, and then the valve out of about 1/3 of the valve body, that let go, the valve body should be able to The weight of the role of the valve seat, and then turn the valve any angle test, the results should be the same. 3, the valve repair parts out of the oil valve determines whether the key part of the work is to seal the cone. Sealing cones a slight wear or poor contact, the sealing cone can be evenly coated with abrasive paste, and then insert the seat rotary grinding, grinding several times, and then converted one direction of grinding. Be careful not to stick the abrasive paste to the pressure relief ring. After grinding for a certain period of time, wash off the abrasive paste, and then dipped in diesel interoperability, and the valve in the valve tap a few times. Grind, clean, and then seal performance test.
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