How to maintain and repair L28/32 diesel engine parts marine bearings

Large-scale machinery cannot be rotated manually, so immediately cut off the power after starting without load, and the machinery is idling. Check for vibration, noise, and contact with rotating parts. After confirming that there is no abnormality, enter the power operation. The power operation starts at a low speed with no load and slowly increases to the rated operation under the specified conditions. The items to be checked during the test run are whether there are abnormal sounds, changes in bearing temperature, leakage or discoloration of lubricants, etc. If an abnormality is found, the operation should be stopped immediately, the machine should be inspected, and the bearing should be removed for inspection if necessary.

Maintenance, overhaul and troubleshooting of marine diesel engine parts

1. In order to maintain the original performance of the rolling bearing and use it in a good condition for a long time as much as possible, the bearing must be inspected and maintained regularly to prevent malfunctions, ensure reliable operation and improve efficiency.

2. Regular maintenance should be carried out in accordance with the operating conditions and operating standards of the machine. The content includes monitoring the operating status, replenishing or replacing lubricants for marine bearings, and regular disassembly inspections.

3. Maintenance items during operation include bearing rotation sound, vibration, temperature, lubricant status, etc.

4. An abnormal state is found during operation, find the cause, and take corresponding countermeasures. Check the disassembled bearing carefully as needed.

5. Matters related to the disassembly, the overhaul of the bearing. Bearing temperature can generally be estimated based on the external temperature of the bearing seat. However, it is more accurate to use the oil hole to directly measure the temperature of the outer ring of the bearing. The bearing temperature gradually rises from the start of operation, and usually stabilizes after 1 to 2 hours. If the bearing is installed improperly, the temperature will rise sharply, resulting in abnormally high temperature. The reasons include too much lubricant, too small bearing clearance, poor installation, and too much friction in the sealing device.