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Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8538
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Mitsubishi Lancer Evolution: I HAVE A 2006 EVO THAT WAS TOWED

Customer Question

I HAVE A 2006 EVO THAT WAS TOWED INTO OUR SHOP FOR CLUTCH PROBLEM. wE FOUND THAT THE THROW OUT BEARING SPRING IS DISLODGED. WE REPLACED THIS CLUTCH WITH PARTS PROVIDED BY CUSTOMER ABOUT 3 MONTHS AGO. THIS SPRING WAS NOT REPLACED DURING THE CLUTCH REPLACEMENT. WHAT COULD HAVE CAUSED THIS SPRING TO BECOME DISLOODGED AFTER 3 MONTHS OF DRIVING (HARD DRIVING)?
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.
Hi, It is possible for extra spirited driving to cause this to happen. Specifically there are conditions where the fork will travel beyond ideal limits, which will cause the bearing to pop out of the retaining ring. This can theoretically damage the retaining ring when it comes free as well.To address this for people that track the vehicles etc (beyond normal driving habits), there are two fixes available. There is a monolock retainer that replaces the original retaining ring set up like shown:http://www.maperformance.com/act-monoloc-one-piece-collar-pull-type-clutches-884006p.htmlAnd there is a stopper that prevents the fork from traveling too far as well like shown:http://www.maperformance.com/map-clutch-fork-stop-mitsubishi-evo-8-9-x.html And of course there is always the possibility of having a defective retainer or a worn out retainer if the pressure plate was reused (though it doesn't sound like it was). Additionally the ring can be damaged during transmission installation if the input shaft were to hit it and bend it etc... however you would have known about this right away. They usually pop off within the first dozen or so presses of the pedal if they get damaged during install. It is not too realistic to expect it to wait 3 months before it showed a problem. What is more probable is that it is either a defective/low quality new retainer, or that the fork over-extended, pulling the release bearing out of the retaining ring while it is not compressed (like when you disengage it), causing damage to the retaining ring.

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