Examination
1. When repairing, it is always recommended to replace old liners with new ones, but do not rush to throw away old liners - they can tell a lot about the condition of the engine being repaired (pic. 11.1).
Pic. 11.1 Typical earbud damage
2. Destruction of bearings occurs due to lack of lubrication, excess dirt and foreign inclusions in the oil, engine overload or corrosion. Whatever the cause of the bearing failure, it must be corrected before the engine is reassembled to prevent it from happening again.
3. For survey of loose leaves remove them from the engine, having dismantled covers of radical and rod bearings. Lay the liners on a clean, level surface in the order in which they are placed on the engine. This will make it possible to correlate bearing problems with the corresponding cylinders. Do not touch the inner surface of the earbuds to avoid damaging the delicate surface.
4. Dirt and other foreign particles enter the engine in various ways. They can remain in the engine after reassembly, or get through filters or crankcase ventilation. They can get into the oil and with it into the bearings. Often there are metal particles in the oil, which are products of normal wear or machining of parts. Abrasives often remain in the remanufacturer's engine. especially if the engine is poorly flushed after treatment. Regardless of the source, these foreign particles often end up embedded in the soft metal of the liners, where they are easily recognizable. Large particles will scratch both the neck and the liner. The best remedy for these diseases is cleanliness - wash thoroughly all engine components and keep everything spotlessly clean during the assembly process. Frequent and regular oil and filter changes are also recommended.
5. Lack of lubrication (or termination-lubrication) has many related causes. Elevated temperature (oil becomes unacceptably thin), overload (presses grease out of plain bearings). increased bearing clearances. worn oil pump, high engine speeds cause lubrication to stop. Clogged lubrication channels, often as a result of misaligned oil passages in bearings, cause oil starvation in bearings and prematurely fail. Increased friction temperature will color the liner substrate in tint colors.
6. Bearing life is greatly affected by driving style Full throttle ("pedal to the floor", "full hole"), riding "into tightness" create heavy loads on the crankshaft bearings, squeezing the oil film out of their gaps. This weakens the liners, leaving micro-fatigue cracks in their running surfaces. The cracked material lags behind the substrate in pieces.
7. Short distance driving leads to bearing corrosion because condensate and corrosive gases are not removed from cold engine oil and form acid and sludge in it. All this is supplied together with oil to the plain bearings.
8. Incorrect installation of bearings naturally leads to wear. Over-torqued bearings have insufficient clearances, insufficient clearances have insufficient lubrication. Dirt and debris clog insufficient clearances, leaving bearings without lubrication.
9. Do not touch the inner surface of the earbuds with ice when assembling, so as not to scratch their delicate surface and leave stray dirt.
10. As noted at the beginning of the non-standing paragraph, the liners must be replaced with any disassembly of the crankshaft bearings. Don't skimp on replacement pads.
Visitor comments