Crankshaft abrasion and damage repair method for tanker

When the crankshaft of the tanker is less curved, it can be eliminated directly by the grinding method. If the bending is large, generally more than 0.3mm, should be straightened and then grinding. The method of correction is generally two kinds of straightening and surface striking straightening.

The wear and repair of the roundness and cylindricity of the crankshaft crankshaft can be performed by direct grinding and other processes according to the degree of wear. Crankshaft grinding, the general crankshaft journal repair is to use the repair size method, that is, according to each 0.25mrr-size grade grinding journal, and then select the appropriate size of the bore to reduce the bearing. The preventive measures for the damage of the crankshaft of a tanker are to inspect the engine carefully. It is necessary to check carefully whether there is crack on the stress concentration part of the crankshaft and find that the damage should be repaired in time. When grinding the crankshaft, the transition fillet between the journal and the crank should be maintained, and sharp corners must not be ground. Otherwise, a large stress concentration will occur and the crankshaft of the oil tanker will be damaged. Pay attention to the balance between the crankshaft, flywheel and clutch. When the clutch assembly is fixed on the flywheel, spacers should be installed at the fixing bolts. There should be no chattering and the working conditions of the crankshaft should be degraded. Periodically check the pre-tightening force of the anchor bolts of the tanker bearings and flywheels. Install the tank car crankshaft main bearing cap nut tightening when installing the tanker crankshaft to tighten the main bearing cap nut , and tighten it several times according to the specified tightening torque and order. During the maintenance, it is found that the shaft and the bearing are worn and the clearance exceeds the limit. The bearing of the corresponding size should be replaced in time. When installing the main bearing cap, install it according to the original matching mark and direction. In use, the tanker engine must not be overloaded for long periods of time. The starting must not be excessive, and the acceleration pedal cannot be used to suddenly engage the clutch to overcome overload or overrun obstacles and to prevent the crankshaft from generating excessive shock loads. Always check the height of the lube oil level on the oil pan, and add it in time if it is insufficient. Regularly replace the oil and clean the oil passage to ensure that the engine of the tanker truck is well lubricated and to prevent the occurrence of accidents caused by the burning of the brake shoe.

The engine crankshaft of the tanker is equipped with 4 integral weights, the thrust journal is in the 4th main journal, full-support structure, and 40Gr of high-quality alloy steel is forged, and its core structure is uniform after quenching and tempering. The strength and toughness. Quenching of the journal and fillet surfaces results in extremely high fatigue strength and good wear resistance. The journal surface must be repaired or renewed when its wear exceeds scratches or scratches and is severely ablated. The main bearing cover bolts are tightened three times and the final tightening torque is 176 N·m. After the main bearing bolt is tightened, check the coaxial axial clearance, which should be in the range of 0.10-0.30mm, and the rotational torque should be 0.5-2.5N·m. It is advisable to rotate the crankshaft crankshaft evenly for two weeks. Looking at the tanker driver's friends must pay attention during use.