On the timeliness of damage repair
On one ship, an eccentric drive pin with a diameter of 9 mm broke at the automatic lubricator of the nose cylinder group of the main engine. The chief engineer, instead of following the direct instructions of sections 88, 91 and 130 of the "Rules for the maintenance and Care of marine internal Combustion engines" to immediately eliminate defects and provide the necessary lubrication, instructed to switch to cylinder lubrication by manually turning the nose lubricator 10 revolutions every 5 minutes. As a result of this order, each cylinder received less than 60% of the required amount of lubricating oil, the number of revolutions of the machine was not sufficiently reduced, the piston of cylinder No. 2 heated up to sparking and raised the temperature to 400 ° C. Heating the piston caused it to break, the cylinder sleeve and cylinder were also significantly damaged. The piston burst in several places, and wide-open cracks formed on it. The cylinder sleeve was deformed, and a large number of cracks appeared on it, extending in all directions. The piston and sleeve could not be repaired due to their condition. Two cracks formed in the cylinder block No. 2, which required serious measures to eliminate.
These damages were the result of neglect of basic measures to eliminate the resulting heat, as well as improper actions of the chief mechanic.
After the failure of the lubricator drive, it was necessary, in accordance with section 55 of the "Rules", to ensure continuous lubrication of the cylinders, adjust it by supplying the fully required amount of oil. The number of revolutions of the main engine should be reduced to low speed.
In accordance with section 130 of the "Rules", it was necessary to immediately begin repairing the damage, which required 2-3 hours to repair. The chief mechanic did not follow these instructions of the "Rules".
Moreover, the measures he took to eliminate the heating of the piston turned out to be incorrect. It was necessary to reduce the engine speed to low speed, turn on the fuel supply to the emergency cylinder, and apply enhanced lubrication through existing lubrication channels to the emergency cylinder. After making sure that the piston had cooled down, it was necessary to stop the machine, turn on the shaft-turning device and rotate the engine until it cools down completely, supplying abundant lubrication all the time. Instead of taking these recommended measures, the chief mechanic stopped the engine and, turning on the shaft-turning device, cranked the engine while applying cold oil to the piston piston through the lamp with a syringe. These actions caused a sharp local cooling, which was the main cause of piston cracking. The piston and sleeve, as indicated, fell into complete disrepair, and cylinder block No. 2 required a bandage and welding cracks. The vessel had to be decommissioned to repair the damage. ma chance casino
