ProPilot04

iTrader: (11)

So I just pulled my clutch, and dropped my flywheel off at the machine shop. It was super late at night, so maybe I wasn't thinking clearly, but I now recall seeing 3 blue spots on the back side of the flywheel.

Now... I'm not a moron, but I've also never done a clutch/flywheel job before, and I've heard the term "blueing" and it has a negative connotation.

My questions are.

1. Without dispelling your grandpa's garage rumors... what is blueing? Is it simply what it appears to be in that the flywheel has heated up in those spots, and thus the hardness of the metal changed there? This (to me) seems like it would be bad...

2. Are Evo flywheels resurfaceable? They're flat, unlike the DSM's, so it would seem easy enough to not screw up? That's not a can they be resurfaced question, because anything "can", it's about whether a good condition stock flywheel should be resurfaced.

If anyone has anything to say about flywheels in general (without getting into a brand debate) feel free to add that as well.

Oye. Where the hell is my credit card...

chu

iTrader: (72)

If you can afford the downtime to take the flywheel to a machine shop for resurfacing, then do it. There's absolutely nothing wrong with resurfacing the flywheel unless the shop has to take so much material off redering it unsafe; usually unlikely.

evodriver49

iTrader: (6)

those heat spots are completely normal! really depends on driving. Yes its resurfaceable, but how much meat is left on the flywheel, is it warped? i would recommend the ACT streetlite flywheel if you do buy an aftermarket one, the stock one was so heavy and revved so slow...

ProPilot04

iTrader: (11)

There was plenty of meat left, and I'm not even sure it was really warped. But since this was my first venture into the trans, I figured I'd give it a look.

If those blue spots are normal heat marks, is that what blueing is referred to? And why do people seem to indicate it's bad?

EvoJoeIX

iTrader: (16)

When people talk about blueing the flywheel, they are usually talking about the friction surface where the clutch disc grabs. Once you slip the clutch enough to create enough heat to blue the friction surface, it will usually be glazed over and the clutch will continue to slip.

On some flywheels you can also generate cracks in the blue spots, not sure if this happens on evos much, but ive seen it on other cars

ProPilot04

iTrader: (11)

Thanks Joe!

Now imma go drop that crossmember this week, and get this hot action bolted back up!

bigben

iTrader: (4)

Those 3 blue spots on the backside of the flywheel are more than likely from where the 3 dowel pins are pressed into the flywheel to help align the pressure plate when bolting it on. When a flywheel is getting resurfaced, they have to heat up the pins to remove them. Heated metal sometimes turns "blue".