- Symptoms of Fried Piston Rings
- Broken piston ring? Cause?
- Detecting symptoms of the bad piston rings
- What Are Signs of a Blown Piston Ring?
- Symptoms of Blown Piston Ring
Symptoms of Fried Piston RingsIf your piston rings do become worn out or damaged, you will start encountering a myriad of problems and issues. This is why it's better to look out for the warning signs so that you can get them resolved in time. The piston rings fit round the piston head, the large part on top of the piston. The piston moves up and down a cylinder to compress the gas and power the engine. To aid in this process, the piston rings:. The piston rings move up and down the cylinder, so they need to be robust. To reduce wear they are lubricated with motor oil and are made from durable metals mainly iron and steel. As durable as they may be, however, they can wear out or become broken. The main reason for this is wear over time. It is possible they will become loose or broken for other reasons, but these would need to be more specific. If there is a problem with your piston ringsthe motorcycle will experience various symptoms. These symptoms may be similar to other problems you may see when there is poor compression in your motorcycle. While these symptoms may not be a sure sign of having bad piston rings, they can be good indicators that you need to check your piston rings for damage or wear. If this is the case, they may need replaced immediately. Some of the symptoms to look out for are:. When you notice any of the above symptomsyou should consider the different possible problems which may be affecting your motorbike. Damaged piston rings are only one of them. Ideally, you will take the motorcycle to a qualified mechanic. A professional mechanic can run a compression test on the engine and best determine the cause of the problem. A compression test, also known as a leak-down test, works by introducing compressed air into a cylinder and working out the rate of leakage. This requires a compression gauge. This is similar to the gauge used to check tire pressure, but it is usually more durable and adapted to the cylinder itself. You can purchase this compression gauge yourself, but you will have to weigh up this cost with how much you would use it. Whether you or a mechanic are testing the motorcycle cylinder's pressurethis is the process:. Once the readings have been recorded, you need to check it against the motorcycle's manual to know what level it should be. If you do not have a manual, you should be able to look online. However, there are so many complicated parts to testing a cylinder's pressure that a mechanic should do it if you are unsure what you are doing. Also, although a compression test will help us to check if the piston rings are bad, there may be other reasons why the cylinder has lost pressure e. A more direct way to check if the piston rings are bad is to take a look at the them. As we said before, the piston rings are located around the piston head. You can look at their quality by seeing if they have any evident damage. Although they are made from durable metals, they can be worn. Unfortunately, to check the piston rings directly is not an easy task. It will require removing the entire topend of the motorcycle. Once this happens, it is possible the piston rings look fine, but are actually letting oil slip or damaging the cylinder. This is why you experience any of the above symptoms, you should check the pressure first.
Broken piston ring? Cause?
Each piston in your car's engine is equipped with two separate compression rings toward the crown of the piston, and an oil control ring assembly toward the skirt. The rings ride within annular grooves in the piston. The compression rings contain the pressure of the expanding gases within the combustion chamber, helping to harness the power being generated while preventing blow-by gases from entering the crankcase. The oil control ring assembly scrapes excess oil from the cylinder walls ahead of the compression rings to prevent the oil from entering the combustion chamber. A failure in any of these rings will result in a loss of performance coupled with other problems and symptoms. The effect of a broken compression ring will immediately manifest itself in the form of loss of performance, rough idle and possibly a dead miss in the affected cylinder. Lack of containment of the combustion gases will cause blow-by gases to enter the crankcase and exit through the positive crankcase ventilation system. Your PCV valve will most likely be located on a valve cover. Disconnect the breather tube from the PCV, and if you notice a strong and smoky discharge from the valve, then chances are good that compression rings are broken. Besides the obvious performance problems, other problems can develop over time. For instance, a diesel engine that runs high-sulfur fuel, such as in farm or marine applications, can be severely damaged by a compression leak. Partially burned fuel blows by the rings, and the sulfur in the fuel mixes with water traces in the oil, and combines to form sulfuric acid, which will damage the internal components of the engine. In gasoline engines, the fuel acts as a solvent that thins the oil and prevents it from properly protecting the internals. Check the compression using a compression tester. Your compression typically should be around to psi, with no more than 15 percent variation between the cylinders. If the compression is low on one cylinder, you may have a broken ring on that cylinder. A broken oil control ring assembly will be noticeable by the quality of the exhaust, which will turn blue and have a decidedly oily smell to it. The exhaust will emit a puff of blue smoke per revolution for the bad cylinder, and normal-looking exhaust for the good cylinders. These stacatto puffs makes it easy to diagnose visually. Other symptoms include oil loss in the absence of leaks, and oil fouling on the spark plug of the affected cylinder. Besides the damage caused by blow-by gases, improper lubrication and free hydrocarbons in the oil, there may be mechanical damage evident. The ends of the rings can gouge the cylinder wall, preventing the other rings from making good contact with the cylinder walls and exacerbating the symptoms. The annular ring grooves in the piston can be damaged, and since the cylinder walls and rings are both harder than the aluminum piston, the piston itself can be damaged or partially broken, leading to even greater damage. Since any broken pieces are likely to wind up in the bottom of the crankcase, possibly causing more damage, you should repair broken rings promptly. You can pull the head to inspect the cylinder walls for damage, or use a small mechanic's camera inserted through the spark plug hole for a less-invasive procedure. As long as the rings were properly sized and installed during engine assembly, any failure in the rings are most likely being caused by another mechanical problem. When an engine becomes overheated, for instance, the piston will expand, reducing the piston-to-cylinder clearance. This reduced clearance can cause a metal transfer from the piston to the cylinder wall called galling.
Detecting symptoms of the bad piston rings
Once the cylinder head is removed, a tell tale sign of ring wear is washing of the outer edge of the piston. At high mileage this is a perfectly natural occurrence even when strict service guidelines are adhered too. The average medium sedan generally travels aroundkilometres before being affected by worn out rings. We could be considering worn out rings a premature condition anything under this mileage, depending upon driving conditions and service records. Premature ring wear is generally caused by poor service of the air and oil filter system. Performance of rings is effected by both the quality of the air and of the oil. Driving conditions will determine if service intervals should be shortened to guarantee the protection of the engine. Wrong choice of ring material to the application can be a cause. Eg: cast iron instead of chrome top rings. Abrasive wear is the most common cause of ring failure soon after an engine rebuild. This condition is a result of poor workmanship and can never be blamed on the parts. Close inspection of the worn rings will confirm the cause. Multitudes of vertical scratches will be visible on the rings and the piston skirt. Normally the oil ring will be extremely worn and the piston will now measure under acceptable wear specifications. The edges of all rings will be excessively sharp. The engine oil will be extremely black within the first kms. Due to the cause of this failure almost every other engine component can be effected with abnormal premature wear. The engine will be destroyed before the first km engine service. Due to the nature of the abrasive material involved it will also become imbedded in the bearings resulting in abnormal crankshaft wear. The term used to describe an engine that has accelerated ring and bore wear due to air born abrasive contamination is a "DUSTED" engine. An engine subject to air borne contamination can be destroyed in a very short period. Poor air filter service procedures, inadequate filter system, vacuum leaks, intake hose leaks, intake manifold leak and leaking PVC system etc. The cause of this wear is very evident at strip down. An initial examination of the intake manifold can reveal the contaminant as it gets trapped in blind crevices and the rough casting areas. The air cleaner tube or the engine side of the air filter may also show evidence of the contaminant. Often at first glance the inside of the intake manifold looks abnormally clean with all marks and stains polished off. Upon dismantling the engine wear is very evident on the upper bores.
What Are Signs of a Blown Piston Ring?