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OEM Harmonic Balancer (Crank Pulley): DSM/EVO 1-3

OEM Harmonic Balancer (Crank Pulley): DSM/EVO 1-3
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Genuine OEM part.

It is well known in the DSM community that the stock harmonic balancer (usually referred to as a crank pulley) is prone to failure. Having a crank pulley fail while the engine is operating is never a GOOD thing! In fact, it can be really BAD.

Before we go any further, we feel obliged to explain this whole "prone to failure" designation. First off, it is NOT a flaw in the design of the part. Mitsu designed the pulley as they did on PURPOSE. One of the main functions of the crank pulley is to "dampen" the vibrations that are produced by the crankshaft during the engine's operation. (This is why the crank pulley on a DSM is more properly called a "harmonic damper/balancer" (harmonics are vibrations--specific kinds of vibrations)). It achieves this vibration damping with the use of a rubber bushing that sits between the two separate metal rings that make up the crank pulley. Herein lies the dilemma: separating the two metal components with this design is an excellent way to dampen vibrations, however, it does make the unit prone to separation--there's virtually no way around it. Mitsu has always been aware of these facts and have always considered the crank pulley as a "wear" or "maintenance" item. (To be sure, it was designed to last at least the entire warranty period associated with it). Similar to clutch components, brake rotors, etc. No one expects these items to last forever. Having them "wear out" is hardly evidence of a design flaw.

In any case, regardless of the hows and whys of a crank pulley separating, having one do so while the engine is operating is never a good thing. But how do you know when yours is about to fail? Well, you hardly ever do. They will rarely give any kind of recognizable symptons prior to failure. Sometimes you'll get a bit of a clicking or squeeling sound, sometimes the pulley will start to rub on the t-belt cover, etc. As we say, SOMETIMES it gives a warning, but usually it doesn't. It merely fails "out of the blue" as they say. It is for this reason that knowledgeable DSMers consider the crank pulley a wear item that should be replaced periodically. We feel a good rule of thumb is to replace this item every second timing belt change. We think it makes a rather inexpensive contribution to one's peace of mind.

NOTE: This unit is attached to the crank sprocket using four bolts. Of course, the old bolts can be re-used, but why not start fresh all around and replace the bolts as well as the harmonic balancer? For details, please refer to "Related products" near the bottom of the page.

Application: DSM (90-99), EVO (I-III).

For your convenience, a set of OEM bolt/washer assemblies and ARP bolt kits are available as an option.
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SKU 1K-MIT-MD376608
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