With it on stands, unladen, it could be that the routing is changed just
enough to eliminate the sound. Disconnect it and give her a run up the
road.
B
-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of Tim Gaines
Sent: Wednesday, May 16, 2012 8:08 AM
To: Triumphs@autox.team.net
Subject: Re: [TR] TR6 tranny sound?
I've had a few suggestions that I've ruled out such as wire wheel splines
and loose wheel lugs, and a few other ideas that I'll check out, but I don't
think I've gotten the answer to the noises yet. I'm now wondering if the
speedometer cable could be responsible for the "zzzup" sounds I am hearing.
It seems likely that it would make noises at takeoff but then quiet down (or
maybe just get high pitched and less noticeable). But I'm not sure why I
wouldn't hear anything with the car up on jackstands and the wheels under
power.
Tim
At 06:00 PM 5/15/2012, you wrote:
>I thought I was leaving for a nice drive of about 150 miles in the
>TR6 a few days ago, but I didn't get farther than the gas station
>before some nasty noises turned me right around. When taking off from
>a stop I get a crunching sound plus a "zzzup" thrown in once in a
>while. My first thought was that I had a stone or two from my newly
>graveled driveway sitting on top of the drive shaft. But I also
>thought it could be the tranny or the differential, and I didn't want
>to take any chances out on the road. I got home okay. In fact, the
>car ran smoothly once up to speed. It only made the sounds at takeoff.
>I got it up on jackstands and couldn't find any evidence of stones or
>loose flange bolts at either end of the drive shaft or at the rear
>axles. I also couldn't reproduce the sounds with the wheels off the
>ground, either with the rear wheels under power or by turning the
>front ones by hand. I also couldn't feel or hear anything when I
>turned the rear wheels by hand or the drive shaft with a wrench on the
>flange bolts.
>
>When I got the car on the ground and found that it still made the
>sounds (no lucky fix!), I started thinking it might be a disc brake pad
>issue. It seemed like the sounds were coming from the front. Today I
>replaced the pads and the nasty looking anti squeal shims. In the
>process I rotated the rotors with and without pads in place and got no
>noises. However, I did get something like the "zzzup" noise when I
>deflected the rotor guard into the rotor while turning it. After
>everything was back together I made sure that the guard wasn't touching
>the rotor before getting the car back on the ground. Just took a drive
>up the road, and nothing has changed; crunchy noises and "zzzups" at
>takeoff, forward and backward, but fine after it's up to speed. I
>think I can feel a little something through the shifter when the noises
>occur, but I'm not really positive about that. I also think that the
>noises stop when I disengage the clutch, but by the time I reach speed
>enough for that, the noises are usually gone anyway.
>
>So folks, what am I up against? Does a transmission make those kinds
>of noises when it's failing? Is there something else I should be
>looking at? Thanks for any help you can offer.
>
>Tim
>1974 TR6
>1980 Spitfire
>
>** triumphs@autox.team.net **
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