Several Methods for Repairing Cylinder Head Cylinder Cracks

First, the patch method patch method is mainly used to repair more cracks, but also relatively concentrated, or part of the body surface of the outer surface of the hole. The repair methods are as follows: 1 Remove the oil, paint, and other materials near the crack to prepare the patch; 2 Use 3 to 5 mm drill bit to drill holes at the end of each crack to prevent cracks from extending; 3 Use a low carbon steel plate of 2.5 to 3 mm Into a patch, the patch is larger than the crack around the 20 ~ 30mm; 4 drilled around the patch plate, hole spacing l5 ~ 20mm, aperture 3 ~ 5mm; 5 will cover the crack on the board to make it with the cylinder block or cylinder Fit the cover tightly, then use the patch plate as a template to drill on the cylinder block or cylinder head and tap; 6 Fix the patch plate with screws, and put a layer of asbestos between the patch plate and the cylinder block or cylinder head. Pad, or apply red oil on both overlays. Second, cutting silk method This method is often used to repair a single crack. The methods are as follows: 1 Drill holes 1 and 2 are drilled at the two ends of the crack firstly with a φ3~5mm drill bit, then holes 3 and 4 are drilled every 2~4mm; 2) tapped in the drilled holes; The copper rod screw is screwed into the hole, and the screwed length is the same as the thickness of the cylinder wall. Then the copper rod is cut off and its section is 2mm higher than the cylinder block. 4 In the same way, a series of drill holes are drilled according to the sequence of drilling in the figure. For the hole, tap and screw in the copper rod screw. A screw chain is formed on the entire crack; 5 Lightly tap the riveted copper screw to leave a part, make it riveted and clamped tightly; 6 Finally, check whether the crack leaks by the water pressure method. If there is a slight leak. Continue to lightly rivet the copper screws at the place where you are leaking. Third, the electric welding method first with φ4mm drill bit at both ends of the crack drill hole, along the crack "V" groove groove, the depth of the groove does not exceed the body wall thickness of 2/3 is appropriate. Use φ4mm metal electrode (requires a reasonable process) or weld with a cast iron electrode under heating. In order to prevent internal welding stress or warpage after welding, each weld segment should be lightly tapped from the two sides of the weld bead with a small hammer. At the same time, when the bead is red hot, the bead is used to beat the bead to eliminate welding. Slag. If the crack is too long, it is necessary to separate the welding repair section, generally 20 to 30mm in length, until the distance from the weld bead is 70mm, so that it can be touched by hand, and then weld the next section. If the crack is too deep, a multi-layer surfacing method may be used, and welding must not be performed once. Fourth, glue connection method to repair the crack of the cylinder block as an example, the method is: 1 to remove the silver powder and rust around the cracks of the cylinder block with No. 1 coarse sandpaper, the grinding width of 30mm, the length exceeds the two ends of the crack 30mm; 2 with a rake edge Crack line cut width is 3mm, depth is 2mm "V" groove, and drill holes at both ends of the crack; 3 first with a metal cleaning agent around the cracks, wait until dry and then scrub with alcohol again; 4 deployment of agricultural machinery 1 No. glue; 5 with a good glue to fill the first stop hole and "V"-shaped groove, and around the groove and pre-prepared good cloth (width 20mm, length exceeds the crack length 10mm) coated with glue, The cloth sticks to the crack, and in the place where the original leakage was serious, stick the second layer of cloth with the same method, and finally evenly apply a layer of glue on the outside of the cloth. After such treatment, the engine can be put into use after 24 hours. If in winter, in order to speed up the curing of viscose, hot water should be injected into the water tank to keep the body at a higher temperature.