The burning tile refers to the main journal and the bearing of crankshaft, connecting rod or shaft and connecting rod between due to lack of lubrication oil, or the gap is too small and the oil film rupture, bearing and shaft neck surface direct contact with dry friction caused by the.

1, reasons

(1) lack of oil. Baotou North Benz accessories oil pump failure, low oil pressure; oil blockage, strainer or filter is too dirty, blocking, bypass valve failure; bearing assembly bearing too tight or too short, bearing rotation, the oil passage blockage, resulting in lack of bearing lubricating oil and burning tile.

(2) bearing and shaft neck with the gap is too large, the oil film pressure is small; the clearance is too small, or Bush raised too high, tile mouth deformation, direct contact between the two friction surfaces in the work area is far greater than the specified value, the friction heat rises rapidly and the bush burned higher.

(3) the degree of roundness and cylindricity of crankshaft neck is not allowed to form oil film.

(4) the crankshaft is bent or the main bearing bore is different.

(5) Baotou northern rush spare parts engine over a long period of work overload, engine overheating.

(6) lubrication is not applied on the surface of the assembly.

2, removal methods

The Bush must be replaced and the crankshaft journal must be repaired after firing the tile. The bending of the crankshaft, the bending of the connecting rod and the concentricity of the main bearing seat hole of the engine block shall be checked. If the allowable value is exceeded, correction and repair shall be carried out.

3, prevention

From the cause of burning tile, ensure the lubrication work well, strictly comply with technical standards and operating rules to assemble the bush.

The alloy on the working surface of the bearing bush falls off

After running for a period of time, the diesel engine forms a circumferential groove shape on the crankshaft journal and the surface of the Bush, and a certain amount of powder bearing alloy, other kinds of metal and non-metallic sundries are contained in the oil.

1, reasons

(1) the sintering of the bearing alloy and the back of the steel is not firm, or because of the high speed and over load of the diesel engine, the alloy of the alloy on the working face of the Bush has been removed and the alloy has been lost.

(2) the crank shaft journal or the work surface of the Bush groove, so that between the journal and the bush of sharp metal or non-metallic debris, in the journal and bearing relative movement, forming "cutting" caused by.

2, preventive measures

(1) the use of high quality lubricating oil, regular inspection of oil quality, found that dilution, deterioration should be promptly replaced.

(2) strictly abide by the operating procedures, the correct use of vehicles, as far as possible to avoid heavy load, low speed, overload operation. Diesel master WeChat

(3) strictly repair the technical procedures, pay attention to the cleanliness of parts assembly; according to specifications matching bearing, strictly check the bearing clearance.

Bush corrosion

1, cause corrosion

In general, because of the impurity of lubricating oil, the chemical impurities (acidic oxides and so on) invade into the bearing alloy, and the oxide is produced mainly by the oxidation of the engine oil at high temperature. When the oil temperature is below 150 degrees, corrosion is slow.

2, preventive measures

In order to prevent the corrosion of the Bush, it is necessary to pay attention to the temperature of the lubricating oil and cooling water, and avoid the engine working at high temperature. To ensure that the oil is clean, to ensure that the lubricating oil filter work is good, regular cleaning of oil filters, change the filter, regular replacement of new oil.

The clearance between the Bush and the shaft is too large

1 、 diagnosis

The diagnosis is available when the stethoscope in contact in the upper part of the crankcase to listen, when the speed gradually increased, the sound change from small to big, the sound than the sound of the crankshaft bearing, oil filler cap open, can also hear the knocking sound, serious when can be heard in the engine side.

The faster the speed, the greater the noise, the more sudden the acceleration is more prominent, the continuous sound of percussion.

Can opener suspicious spark plug grounding short circuit, if the noise reduced or disappeared, and in a voice suddenly removed a screwdriver "when", it can be concluded that the rod bearing ring. If the two cylinder connecting rod bearing ring, with a screwdriver will be a cylinder spark plug short circuit, sound relief; with two screwdriver will two cylinder spark plug short circuit, sound disappeared, indicating that the two cylinder connecting rod bearing ring. Diesel master WeChat

2, exclude

Or determine the crankshaft bearing ring, to remove the Baotou North Benz parts of the crankcase, and check the bearing clearance, if the bearing excessive wear or erosion should be replaced; if the gap is too large, should adjust or replace the corresponding level (repair size) bearing.