Have you noticed that dark smoke coming out of your tailpipe? Generally, that can be caused by engines burning oil inside the car. Apart from this, however, there are specific Volvo engine parts that are causing the problem. What are these specific components? Here is a list.
Valve Seals Gone Bad
Located above the combustion chamber in the cylinder, the valves contain seals that stop the oil from flowing down into engine, most especially when the valve is open. Basically, oil is pumped at a pressure of 40 to 80 pounds per square inch (PSI). This then lubricates the valve train. When seals go bad, there is tendency that the oil flows down to the chamber thus causing the oil to burn. This will then cause a smoke on the tailpipe.
Worn-Out Valve Guides
Another reason for burning oil that causes smoke from the tailpipe is a worn-out valve guide. As the name suggests, this component guides the valves. This is a small cylindrical chamber that may wear out over time, and when it does, it creates an excess gap. Within that gap, the oil flows down to the valve steam and then goes into the combustion chamber. There, the oil burns. Generally, the valve seal is responsible for stopping the flow, but since there is a gap, the seal may have a hard time doing its task. As an end result, smoke comes out of the tailpipe.
Worn-Out Piston Rings
Pistons come with rings that act as seals to these components. These rings are specifically made to provide the lubrication needed along the engine's cylindrical walls. Also, it is tasked to seal the combustion chamber in order to develop power and not lose the firing developed along the cylinder. Once these piston rings wear out, there is a tendency that the combustion pressure reverses and goes down into the oil pan. From there, the oil is pressurized thus forcing itself out into the valve covers. It then goes through the breather in the system, then goes through the fuel delivery system. As a result, the engine gets burned thus producing a smoky tailpipe.
Clogged PCV System
The Positive Crankcase Ventilation (PCV) system is in charge of allowing engine to get rid of excess pressure buildup. It acts as the breather system in the car which causes the engine to allow air to pump into the ride. There are times, however, when carbon suddenly builds up in the PCV system. This will then result in the clogging of air passages in the engine. The oil pan will then be pressurized, and like with worn out piston rings, it goes back to the fuel delivery system where the engine then burns out the oil.
There are specific engine parts that you must pay attention to when it comes to detecting smoke from your tailpipe. Normally, you will conclude that the car needs some oil change when this happens. However, if you have your car sent to a mechanic, the problem may be more severe than usual. There may be a need to replace any of the worn-out or malfunctioning engine part that has been mentioned above.