Engine Maintenance Misunderstandings

Engine repair is a very complex thing and an engine repair manual is very necessary. Here are some common engine repair mistakes that can help you repair your engine more efficiently.

1. Do not analyze the cause of the failure, blindly unloading demolition

Some maintenance personnel due to the mechanical structure of the equipment, the principle is not clear, do not seriously analyze the cause of the failure, can not accurately determine the fault parts, with “about, almost” the idea of blindly dismantling equipment, the results are not only the original failure has not been eliminated, but also due to the maintenance of poor skills and craftsmanship, and then The result is not only the original fault is not eliminated, but also due to poor maintenance skills and craftsmanship, and new problems. When the mechanical failure, to be detected through the testing equipment; such as no testing equipment, through the “ask, see, check, try” and other traditional methods and means of fault determination, combined with the structure and working principle of the equipment, to determine the most likely parts of the failure. In determining equipment failure, generally used “exclusion method” and “comparative method”, in accordance with the order from simple to complex, the first appearance after the internal, the first assembly and then parts, do not "do not ask, blindly demolition Do not “blindly dismantle and dismantle without asking any questions”.

2. Blindly replace parts

equipment failure judgment and troubleshooting is relatively difficult, some maintenance personnel have consistently used the test method, regardless of the large pieces of small pieces, as long as the parts that may lead to failure, a replacement test. The result is not only the fault is not ruled out, and should not be replaced parts replaced at random, increasing the maintenance costs. In the maintenance, should be based on the failure phenomenon to carefully analyze and determine the cause of the failure and the part of the parts that can be repaired to take the repair method to restore the technical performance, to eliminate the practice of blindly replacing parts.

3. Do not detect parts clearance

in diesel engine repair, piston and cylinder liner clearance, piston ring “three gap”, piston top clearance, valve clearance, plunger clearance, brake shoe clearance, master-slave gear mesh clearance, bearing axial and radial clearance, valve stem and valve guide clearance, etc., all types of models have stringent requirements In the maintenance must be measured, do not meet the clearance requirements of the parts to be adjusted or replaced. The actual maintenance work, do not measure the fit clearance and blindly assembled parts of the phenomenon of a number of, resulting in early bearing wear or corrosion, oil burning, starting difficulties or deflagration, piston ring fracture, impact, oil leakage, gas leakage and other faults. Sometimes even due to parts with improper clearance, resulting in serious damage to machinery accidents.

4. Assembly parts installed reverse

In the maintenance of equipment, some parts assembly has strict direction requirements; only correct installation to ensure that the parts work properly. Some parts of the external characteristics are not obvious, positive and negative can be installed, in practice, there are often installed in reverse, resulting in early damage to parts, machinery can not work properly, equipment damage accidents. Such as engine cylinder liners, unequal valve springs, engine pistons, piston rings, fan blades, gear oil pump side plate, skeleton oil seals, thrust washers, thrust bearings, thrust gaskets, oil ring, injection pump plunger, clutch friction disk hub, drive shaft universal joints and other parts in the installation, such as do not understand the structure and the installation of the precautions, the most likely to be installed in reverse. Resulting in the assembly of the work is not normal, resulting in equipment failure. Therefore, maintenance personnel in the assembly of parts, must master the structure of the parts and installation direction requirements, can not be taken for granted blindly installed.

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