When your vehicle has faulty or worn piston rings, the acceleration power of the engine gets reduced significantly. The worn piston rings cause leakage in the gas compression produced in the combustion chamber, the reduced compression means low power. Testing for Leaky Valves. Most often, this noise is caused by low ring tension, broken or worn piston rings, or worn cylinder walls. The piston moves up and down a cylinder to compress the gas and power the engine. The compression rings are located in the first grooves of the piston, with their primary function being to seal the combustion gases and transfer heat from the piston to the piston walls. Symptom - Deposit on piston skirts Cause - Piston rings worn past the maximum ring end gap spec, glazed cylinder walls Reason - This is the most common problem we see. If your oil consumption seems to have increased all of a sudden, then old piston rings could be the culprit. Piston Ring Noise. Diagnosing a Burned Piston If the top of the piston has a melted appearance, or it has a hole burned through the top, the piston has been running way too hot. By testing the cylinder for engine compression you can narrow down the problem in a few minutes. This means that a component in your combustion chamber is worn. If you feel there is something wrong with your car, you must test each part individually. A piston ring is an open-ended ring that is aimed to make the cylinder that contains the piston gas-tight.It fits on the exterior of the piston and tries to seal the combustion chamber, regulate engine oil consumption and support heat transfer. If the reading improves on that cylinder, the piston rings are either worn or cracked. Turn the engine on and have an assistant gradually depress the accelerator pedal to increase the speed of the engine. If the rings are worn past the maximum specification they allow combustion chamber gases to seep past the rings and down the piston skirt causing a distinct deposit pattern. One sure way to test if it is the piston oil control rings is to put the vehicle in low gear and accelerate to 4,000 rpm, let off the gas quick and look in the rear view, when you decelerate with bad oil rings it will smoke much worse than on acceleration. Oil is leaking past the piston ring seal inside the engine cylinders. If the engine is burning oil and there is blue smoke in the exhaust, the problem could be worn valve guides and valve guide seals, worn or broken piston rings, or even a cracked piston. Piston ring noise is also similar to the valve and tappet noise above; however, it is most noticeable during acceleration. Step 1. The vented expander and piston ring groove allow excess oil to flow to the inside of the piston and into the crankcase (see Photo 3). Attach the rubber hose of a vacuum gauge to the intake manifold. As your engine ages, the component will wear and cause issues in the seal of the chamber. It could be a piston, rings, cylinder wall/liners, or valves. To aid in this process, the piston rings: Seal the combustion chamber to keep as much gas in the cylinder as possible. There usually exists both a top and an intermediate compression ring to ensure the maximum power output that your engine can offer is obtained. Step 2. Photo 3: As seen in this photo, a collapsed oil control ring expander and worn oil control rings are indicated when the oil control ring assembly is flush with the piston ring land. When this is the culprit, the problem will be worse after sitting or in colder or even hotter weather. Worn piston rings will emit smoke from the exhaust of any combustion engine. In many cases, only one cylinder may have defective rings. The piston rings fit round the piston head, the large part on top of the piston. 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