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Causes and Prevention of Piston Ring Failure

5/3/2016 4:25:02 PM | by Anonymous

piston ring

One of the significant problems that I have learnt through lots of mechanics, and engine technicians, is that piston rings in heavy duty tractor engines wore prematurely. I have actually heard this grievance many times. As per normal human responses, there is a mission to reasoning the reasons as to why this part failed, as per the grievances from those in the field.

Not unexpected, problems of piston ring failure are blamed on the maker of the rings. It's not uncommon to hear "Do not utilize these kinds of rings" and particular makers are pointed out. However, I have actually heard these complaints about rings from OEM business too.

My analysis led to several relevant discoveries, especially after a certain consumer requested Original Caterpillar Piston Rings, not the rings presented to him. Little that consumer understands that the rings provided to him were made by the same business that is on contract for Caterpillar. The very first mistake that is made that contributes to significant ring failure, is the apparently economic benefit, of altering the piston rings just, however, the piston pin, piston pin retainer, and the cylinder liners are left in the used condition. These recycled parts have clearances due to typical wear on the metal parts that contributes to small but irreversible vibrations within the whole engine. These practically invisible vibrations will lead to premature wear on all components, and most significantly, to the vibration of the rings on the piston head.

An engine with a 2800 rpm rating, with small vibrations at that high speed, will have additional tension and pressure on internal engine components. Besides the vibrations discussed above, the used cylinder liner itself is harmed, with microscopic indentations, scratches, and worn out areas. This adds to an unequal surface area that the new piston rings have to go up and down in at 2800 rpm.

It's this phenomenon that contributes to early ring failure. Piston rings from original companies like Caterpillar and Cummins, will fail too soon in this circumstances. Aftermarket piston rings from other trusted business will fail too soon in these circumstances. The problem remains in recycled cylinder liners, and not piston rings.

It's not unusual therefore, that both OEM and aftermarket companies do not provide a warranty for rings that were altered without also altering the other internal parts, namely the cylinder liner, piston, piston pin, and piston pin retainer.

While certain company service warranty uses, the majority of them will consider this practice as voiding the warranty. The advised thing to do, despite the fact that it's a bit more costly, is to change all the liner kits at the same time. Its more work, it's a little more cash, however, the outcomes are better engine efficiency, less breakdown possibility, less fuel intake, less contamination and GHG emissions, and the most vital part, more comfort for the owner/manager.

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