F355 - Clicking noise from pumpkin

I know, this thread is not very clean, sorry. What I meant was the gearbox noise seems normal IFF you twist the clutch shaft back and forth in opposite directions, which would simulate a 'spikey' load from maybe a cylinder not performing like the others. The noise shouldn't be happening but it's not the gearbox's fault, it's just a downstream symptom. I realize the job of the damper is to smooth out power from the engine but maybe there are certain conditions that it can't handle very well.

Summary:
1) Strange noise thought to come from flywheel, vibration felt in vehicle in at low rpms.
2) Repacked flywheel, replaced all bearings (3), no change to noise and vibration.
3) Re-diagnose noise as radiating from clutch shaft, can repro by twisting by hand.
3) Visual inspection of gears and gear oil, no metal, nothing strange looking.
4) Diagnose noise as clicking between the main drive gears.
5) Proceed to wait on new spark plug wires and gearbox mounts.

 

Does the whole gearbox have to come out and apart to do this? I can't find much info on just removing the clutch shaft. And, is the lock ring pictured in the parts diagram above, like item 17 in the lower right?

 

I found a good picture of the clutch removal tool here, thanks TheItalianJob!

http://www.ferrarichat.com/forum/348-355/234915-348-ratio.html

And I found FBB's instructions from way back in 2002 about using a torch for sure with the slide hammer, thanks FBB! Here's my gismo in the picture.

So anyway, I got it loose, yet as it comes out so does the inner shaft, is it supposed to? I quit removing and pushed it back in for now.

Thanks
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Got the clutch shaft out, the prop shaft came out with it, hope that's normal. And .. I do believe I've found the little noise maker and I bet it's not pretty .. my main shaft! Is a gearbox tear down coming on? I made another video of it.

https://www.youtube.com/watch?v=yIP7KB3DGC4&feature=youtu.be
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Thanks Brewman, it's not what i'm seeing, it's what i'm hearing, and I doubt it's normal. It started out as a clicking noise that I thought was the flywheel, but have now tracked it down to the gear shown in the bottom picture above. I can wiggle it back and forth and it makes quite a noise, check out my short youtube video. The noise occurs in neutral and while on the lift in gear, but only at low rpms. Part number 168047 (bevel set) is apart of the gear i'm talking about.

 

It's funny because now every gear I can put my hands on makes a similar noise, I think i'll just put it back together and ... drive it like I stole it.

 

I really appreciate all your help FBB, and others who've viewed and replied (even non-replies tells me I have peoples heads scratching!) I will be sure to post my end results, may be a while. Thanks!!

 

Well the plot thickens for me. My #6 cylinder only gives me 20 psi on a compression test. #3 is at 70, all the others are 150+. I guess this answers my rough idle issue and probably causes so much 'bounce' that it causes the tranny to make some noise.

Regarding the low compressions, what would be a good next move for me? help.

 

It seems so because of all my panic posts. Let me give a good recap just to tidy up the thread.

Went to track event, last session of day I swapped ends and ended up in the grass with no apparent damage. Made a couple more laps and called it a weekend and came home. Took it out the next day for a test drive and began to notice a low rpm vibration, especially in high gear low rpm acceleration. Pulled into my garage, noticed the rougher than usual idle and also heard the clicking noise. My thought: Do I have two problems or one? The consensus on this board was the clicking noise was the cause of the low rpm vibration, fix that first. I misdiagnosed it to be the flywheel damper (repacked, replaced bearings no change), then decided it was gear noise. Pulled cover and no apparent metal or damage noticed, and can only repro the noise when I move the gears back and forth. Now that movement is not normal, they should be under a consistent load and therefore not make the noise. So my thoughts were then, "what could be causing a non-consistent load to make these gears sound like that?". Replaced tranny mounts, new kingsbourne wires, no change. Decided to do my first compression test ever and, well, it was very obvious that #6 especially is doa. So my new theory is I've been chasing symptoms, root cause=engine. Do I get any credit?

 

Are these good? (just kidding)

cyl------compression------leakdown
1----------150---------------60/100
2----------070---------------11/100
3----------170---------------78/100
4----------175---------------89/100
5----------160---------------69/100
6----------020---------------08/100 (92% leakage)
7----------150---------------11/100
8----------145---------------26/100

Compression was done on medium hot engine, at least twice per cylinder, more on #2. Leakdown was done on cold engine. Car runs great except for the low rpm shudder/ rough idle (I'll stop talking about the gear noise).

 

Got the engine out, throttle bodies off, exhaust manifolds off, getting ready to pop the heads. I played more with my leak down tester and of course with the exhaust manifolds and throttle bodies off you can really tell where the leak comes from. Heck i can stick my finger on the valves and really know. Question: What would make most of my exhaust valves leak? My intake valves are silent. My bypass valve has been wired open since before I bought it 12k miles ago. Would this contribute?
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