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
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