Second, there are a lot of phenomena that do not pay attention to the detection of parts and clearance.
For example, in the maintenance of common diesel generator sets, the piston and cylinder sleeve fit clearance, piston ring "three gaps", piston head clearance, valve clearance, plunger clearance, brake shoe clearance, main driven gear meshing clearance, bearing Axial and radial clearance, valve dare and valve guide clearance, etc., all types of models have strict requirements, must be measured during maintenance, parts that do not meet the requirements to be adjusted or replaced.
In the actual maintenance work, there are many phenomena of blindly assembling components without measuring the matching clearance, which leads to early wear or ablation of the bearing, burning of the diesel generator oil, difficulty in starting or deflagration, breakage of the piston ring, impact of the machine parts, and oil leakage. Faults such as air leaks. Sometimes even due to improper fitting of the parts, the mechanical damage will occur.