Re: [alfa] driveshaft vibrations/looseness

["Gwynne W. Spencer" <gwynnes1@xxxxxxxxxxx>]

The referenced article talks about 105 series cars - I assume the fixes 
also apply to 15 cars ?????

Gwynne Spencer

At 12:07 AM 7/12/2004 -0400, you wrote:
>Hi Richard:
>
>I believe what you're describing isn't all that unusual, and several older 
>GT's I've seen over the years have been updated to the later style center 
>support bearing, including a '68 GTV I owned more than 20 years ago. 
>Here's a link to a Wes Ingram article on the subject:
>
>http://www.geocities.com/motorcity/downs/3837/centsup.html
>
>Running the engine to spin the driveshaft with the car raised is OK, but 
>only if you've got the jackstands under the suspension.  If you let the 
>rear axle hang freely, you will get all sorts of nasty noises that don't 
>necessarily indicate a problem.  Also, it's tough to feel loose u-joints 
>with the driveshaft installed, and the free play you're feeling in the 
>differential is probably OK, too.  You might also have an issue with the 
>transmission mount, but I believe one of the UK vendors now sells a proper 
>reproduction.  Maybe Alfaholics or Highwood Motors?
>
>Regards,
>
>Dean
>Lutz, FL
>'74 & '87 Spider Veloce's
>
>
>At 08:23 PM 7/11/2004, you wrote:
>>Date: Sun, 11 Jul 2004 15:59:34 -0700 (PDT)
>>From: Richard Lane <srlane@domain.elided>
>>Subject: [alfa] driveshaft vibrations/looseness
>>
>>I have a 1967 GTV with some driveshaft issues.
>>
>>A year ago I removed and went through and fixed everything on my driveshaft -
>>front-nose bushing, center bearing, center (old-type rubbery) support, pinion
>>seal (car has a 1980 rear axle so LSD), checked the UJs and they were 
>>perfect -
>>but still now i seem to have two types of vibration.
>>
>>One is the sort of high-speed hum style. This I think I will attempt to cure
>>with the hose-clamp method, right now it's not bothering me that much 
>>because I
>>also have...
>>
>>the second vibration, most noticeable when pulling up to a stop. A real
>>low-speed shudder/judder tooth-rattler, this one needs to go first.
>>
>>So, I jacked all 4 wheels off the ground (w/stands), took the rear wheels off
>>and ran the engine in gear. Not much to notice in 2nd gear, but at about
>>12-1500rpm in 4th gear there is a really nasty clanging/banging/rattle 
>>from the
>>driveshaft, so loud it was impossible to tell whether it was from front or
>>rear.
>>
>>This then, I think, is the same as my low speed vibration, made worse by the
>>lack of wheels and forward inertia to dampen the vibration. Feeling the
>>driveshaft while still on the car it all feels pretty tight, UJs and the
>>splined joint all feel good. But, what doesn't feel good is the play in the
>>shaft as it goes into the diff. In other words, if I apply the brakes so that
>>the hubs don't turn, there is about 5-10 degrees of rotaional play when 
>>turning
>>the shaft before it binds in either direction.
>>
>>So, it feels like a lot and is the only thing (I think) that could cause that
>>rattle. So how much play should there be there? - is it adjustable? - by the
>>home mechanic? Do you think that could cause my lo-speed-vibes?
>>
>>Thanks for any advice,
>>
>>- -Richard Lane
>>San Jose, CA
>>1967 GTV
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