The flywheel being on shouldnt be a problem with checking the crank play so you can leave it on. I'm pretty sure my buddies was still on when the block was out and we checked his play. You just need to have the clutch and pressure plate off because that could cause pressure on the crank that will make it hard to get a good read on the movement.

I just checked my Helms manual and standard crank play is .004"-.014". Service limit is .018". I'd call it safe if its .014" and under. Over .014" and you should probably rebuild. My buddies also clanked when you moved the crank back and forth and thats why we checked it, but it ended up being within specs.

 

We just pulled my ACT HD clutch out 2 weeks ago after well over 65Kmi and 3+ years of driving on it (including track time, two cross-country trips, and plenty of DD (and yes, cold starts)). No excessive crank play.

It's not the clutch guys. It's just that ACT is the most popular aftermarket clutch, and being as it's more likely to be found on modified cars, it's more likely that this clutch will be on a car that has crankwalk (but then, hasn't there also been at least one S with the OEM clutch that suffered from crankwalk? and aren't most of the crankwalked engines also boosted?). Of course, correlation =/= causation except on internet message boards where it's easier to just jump on the bandwagon. That being said, I think I'm going to start a new bandwagon:

Powdercoating my wheels caused crankwalk in my '05. Has this happened to anyone else?

 

You must have gotten the newer version with the updated pressure plate.

 

That sucks dude, hope you get it all fixed up!

 

Nope. Bought it 3+ years ago. Read my post

 

I think the updated one has come out over 3+ years ago. But I'm glad you don't have any issues. Good for you. Doesn't seem like I'm one of the lucky survivors.

So just a coincidence that everyone that has this issued has had an act clutch? Coincidence that ACT came out with an updated pressure plate to resolve this COMMON issue? FYI I've read about others with this problem non boosted as well when I first joined the s2ki forums.


Didn't have time yesterday to work on the car, was too busy working on the new house instead. If LJ has other projects he's working on of his today I'll stop by to dink with my car.

 

I still have the ACT HD non revised version on my ap2 engine. Have been boosted and tracked for about 3 years with no issues. Probably about 30k miles

 

a clutch isnt going to cause crank walk/thrust bearing wear... the ONLY thing that will cause that is a lack of oil.

 

^^ did you ever run low on oil at any point?

 

I have about 30k miles on the old ACT PP. No crank walk issues here. My clutch safety switch is jumped. I'm not worried.