Rattle - Clutch/Trans ? - Alfa Romeo Bulletin Board & Forums
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post #1 of 17 (permalink) Old 02-19-2016, 10:01 AM Thread Starter
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Rattle - Clutch/Trans ?

The Transaxle rattle on my Alfetta GT got real loud, noticeable at idle.
A new clutch was installed 1000 miles ago.
Removed the clutch and I noticed that the driveshaft yoke rotated, like it was loose on the spline of the clutch. The nut was tight as there was no in/out movement. I put that yoke on an old clutch I have and it rotated. I tried another yoke and it did not move. I assume that that yoke wore out over the past 40 years, go figure.
So back together and no rattle. Now clean the car up as we are going to teach at our HPDE School this weekend and I want to properly represent the Alfa to my students. Skid pad here I come.
The clutch, cover and shaft are spare parts, not what is on the car now.
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post #2 of 17 (permalink) Old 02-22-2016, 04:33 PM Thread Starter
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Rattle no more

Well I tested it this weekend.
Several 6000rpm blasts on the skid pad with lots of tire smoke.
Then about 10 miles of track time, 2nd and 3rd gear runs.
Included was 170 miles of driving out and back to the Streets of Willow race track.
All is well. . . . . for now!

Paul Blankenship AROSC
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post #3 of 17 (permalink) Old 02-23-2016, 09:04 AM
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So precisely what are you saying? That the splines were worn on the inside of yoke on the driveshaft or at the input shaft?

How much rotation could you get? Also, if new/different yoke was not available, what would you have done to correct?

Thanks,
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post #4 of 17 (permalink) Old 02-23-2016, 10:29 AM
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Mine vibrates badly at idle with the clutch out. As soon as I depress the clutch it goes away. After transmission rebuild (well, replacement of some gears/synchros). Any ideas?

Nick
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post #5 of 17 (permalink) Old 02-23-2016, 11:17 AM Thread Starter
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So precisely what are you saying? That the splines were worn on the inside of yoke on the driveshaft or at the input shaft?
How much rotation could you get? Also, if new/different yoke was not available, what would you have done to correct?
The yoke was worn, as when I put a different yoke on the same shaft - no rotation. Amount was probably several degrees, enough to feel a "clunk" when rotating it.
Oh boy, if you haven/t collected a bunch of Alfetta parts over the past 25 years you probably do not have one lying around. So my go to is Alfa Parts Exchange, or if you hang around your local Alfa shop too much they may have one and give it to you just to get rid of you.
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post #6 of 17 (permalink) Old 02-23-2016, 11:31 AM Thread Starter
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Mine vibrates badly at idle with the clutch out. As soon as I depress the clutch it goes away. After transmission rebuild (well, replacement of some gears/synchros). Any ideas?
Nick
Here's a pretty good thread on this problem. It starts out with GTV6 which has basicaly the same setup as the Alfetta.
http://www.alfabb.com/bb/forums/alfe...transaxle.html

Oh, another rattle was the reason I replaced the clutch recently. The input shaft was worn where the clutch bearings were. The bearings rocked when seated on the shaft. However, the yoke problem may also have been part of the problem!! Either way I got the new clutch cheap and the old one came from my old Time Trial Alfetta.
So this was the excuse I needed to upgrade my old straight type clutch to the taper type. The straight shaft is the one in the above photo.

Paul Blankenship AROSC
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post #7 of 17 (permalink) Old 02-23-2016, 12:02 PM
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Are you sure that some of the rattling wasn't the nut behind the wheel?

JB in HB, CA
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post #8 of 17 (permalink) Old 02-23-2016, 05:09 PM Thread Starter
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Look for the obvious cause first

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Are you sure that some of the rattling wasn't the nut behind the wheel?
Jim, that is always the first place I check. That is after I check the ground wires.
Hope to see you at the Petersen Museum this Saturday.
I'm told the remodeled museum has a large section dedicated just to the Alfetta GT / GTV6. I think they are right next to Mullen's Bugattis. Or at least that's what I was told.

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post #9 of 17 (permalink) Old 02-24-2016, 04:16 PM
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From my little experience, these sheet metal stack nuts are hardly reusable at all, considering 100Nm torque on them. I eventually replaced it with a pair of jam nuts from afra.it, just like those at the central yoke.

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post #10 of 17 (permalink) Old 02-24-2016, 04:28 PM
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I've had the spline joint at the front of driveshaft/ back of engine get loose and rattle also.

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post #11 of 17 (permalink) Old 02-24-2016, 05:12 PM
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Thanks for the link!
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post #12 of 17 (permalink) Old 02-28-2016, 08:09 AM
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Hey Sideways, thanks for the reply - this post (mainly because you actually found and corrected the fault) has been very informative. This discussion has come-up a few times over the years. Original posters rarely have come back with the root cause analysis. A couple of other 5000+ posts senior members have put-out some bad poop on this (see previous link to same discussion).

The only person that I can recall that has indicated that worn splines are the culprit has been Alfar7. Though he mentioned the ones where the clutch plate/s reside (so now we know where to look if the yokes are tight). Keep in mind that this is the root cause, but isn't what actually makes the noise. Bad harmonics are making the noise via parts in the clutch housing.

I'm thinking that some Locktite 660 Quick Metal may be useful in this situation. ...I imagine that hole-shots attribute greatly to this phenomenon!
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post #13 of 17 (permalink) Old 02-29-2016, 03:57 PM
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I am curious what this rattle sounds like. Does it sounds anything like in the video below? The thing that sounds like a metallic woodpecker...


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Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
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post #14 of 17 (permalink) Old 02-29-2016, 04:20 PM
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I had a rattle in first and second gear that was due to loose bolts in one of the tranny mounts.

Ed Prytherch
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post #15 of 17 (permalink) Old 02-29-2016, 06:33 PM
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So if you have a clutch rattle there is every chance it could be a worn center bearing, a loose donut, loose yoke nuts, worn yoke splines, worn clutch damper springs, worn clutch input shaft splines, a worn throw out bearing or pressure plate, worn clutch flywheel bearings, transmission mount issues or neutral rollover clatter just to name a few..

Crakie........................ what you have is not a rattle that's a KNOCK.

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