The circular device, made of rubber and metal, is bolted at the front end of the crankshaft to help absorb vibrations. It's usually connected to the crank pulley, which drives accessories like the air conditioner. The rubber inside the pulley is what actually absorbs the vibrations and keeps them at a safe level. In essence, the device is designed to help prevent crankshaft failure. The rubber material can deteriorate over time. So, if your harmonic balancer is going bad, you could get rough engine vibrations, a cracked crankshaft, or even a serpentine belt that gets thrown off its track.
The damper is composed of two elements: an inertia mass and an energy dissipating element. Most often made of rubber, this element may be composed of a synthetic elastomer, a clutch, a spring or fluid. The mass counteracts the torsional crank motions and in concert with the energy dissipating element absorbs the harmonics vibrations.
Dampers must be interference fit to the crankshaft in order to function properly. The first three use older technology; First is the liquid type damper which surrounds the mass immersed in the housing which is then bonded or welded together.
Second is the O-ring type which surrounds the mass with a number of O-rings as it sits in its housing. Third is the friction type which has clutches and spring acting on the mass inside the outer housing. Fourth is the newest type in which the mass sits over and is attached an elastomer ring which is then attached to the outer housing. Certain engines, like the traditional V8, have a firing order prone to excessive harmonics by nature necessitating the use of a damper.
The flat plane V8, traditionally used in more exotic engines, does not suffer from the excessive harmonics and therefore may use a solid undampened device. Without the harmonic balancer there is a high risk your crankshaft would crack or a serpentine belt would be thrown off track.
A simple way to think of the harmonic balancer is like a massive stress reliever. It buffers and dampens engine parts and engine performance by absorbing the violent torsion of the modern-day engine.
A fluid isolation system is similar; but instead of using a rubber ring; it relies on a thick silicone fluid. Similar to the viscous clutches used in; radiator fans and AWD center differentials. The rubber isolation ring deteriorates completely. As a result, the pulley completely dislodges from the center portion of the balancer. The most damaging cause would be engine overheating. That extra heat can dramatically accelerate; deterioration of the rubber isolation ring.
In addition to heat deterioration; fluid contamination can also; accelerate decomposition of the rubber isolation ring. The oil and coolant contamination softens the rubber; causing a change in vibration frequency. A technician with a stethoscope can pick up the; vibrations of a bad harmonic balancer. In some cases, you can also see the belt vibration. One of the first symptoms of a potential problem is engine vibration. If the harmonic balancer can no longer properly absorb the harmonic vibrations; the engine will shake excessively.
The shaking will become even more pronounced. As a result, making it dangerous to the engine at high speeds. Heat and engine vibration can cause the seal to become; hard and loose its sealing ability. As a result, allowing residual engine crankcase pressure; to force oil past the seal and out from the engine. Because the seal rides against the inner hub of the balancer; it can cause grooves in the seal surface.
Another symptom of a potential problem with the harmonic balancer is; misaligned timing marks. If the layers separate or slip, the timing marks can shift. This will make it difficult; if not impossible to properly time the engine with a timing light. If a damper is no longer able to absorb crankshaft vibration; the destructive forces will start to; attack the transmission.
The vibrations could damage the; input shaft, bearings, planetary gears and more. Another common issue is the hold down bolt; coming loose or breaking. In fact, some engines are more prone than others for this problem. Located outside the engine block, the crankshaft pulley is essential to ensure other engine components operate in unison to allow the vehicle to run smoothly.
Similarly, if the belt tension is too strong or the auxiliary equipment has failed the pulley will also fail. The cause is linked to the coupling having made contact with the flywheel rim. The crankshaft can bend severely or even break in some cases. The crankshaft position sensor is the most important of all engine management sensors, and the engine will absolutely not run without it. Many systems are smart enough to try guessing should this sensor fail and allow the engine to run without it.
In your case, a magnetic crankshaft positioning sensor is used. Begin typing your search term above and press enter to search. Press ESC to cancel.
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