Mystery noise

nick · Postby **nick** » 05 Apr 2010 18:58

I got the TR7 on the road this weekend. I really love this new 13" TR8 steering wheel. The leather grip is thicker than the original and it feels great. Now for the problem. During deceleration, primarily in 4th gear and down hill, there is a growling noise that I can't locate. It is not from the engine but could be wheel bearings, gearbox or differential. The sound reduces some if I put the clutch in but does not go away. I think it has been there for years but I don't hear it with the hood (top) down. Any ideas? Besides always driving with the hood down.[:)]

nick
'79 TR7

Underdog · Postby **Underdog** » 05 Apr 2010 20:46

This is near impossible but I'll toss out a guess. Since you say it has been there for years, I think any actual mechanical fault would be getting progessively worse. Perhaps an exhaust component touching the body somewhere?

Jim Underwood
72 MGB BRG
80 TR8 Persian Aqua
If women don't find you handsome, they should at least find you handy.

gaz · Postby **gaz** » 05 Apr 2010 21:30

do you also feel a rumbling through the seats maybee more so on the passenger side if so could be ujs on propshaft

It rides again..... and again wehey!!!!!!!

busheytrader · Postby **busheytrader** » 05 Apr 2010 21:30

Hi,

If it occurs around the same speed it might be a worn u/j or cv joint on the propshaft. Same thing happened to me (including going quieter with the clutch down) but with time it developed into a vibration as well.

Wheel bearings tend to get worse when taking a corner, eg turning left loads up the bearings on the right which rumble if worn or vice-versa.

Hope this helps.

Adam

TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes all round, Anti- Dive, Strut-Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights, S/S Heater Pipes, Replacement Fuel Tank. No Door Stickers. Mine since July 1986, V8 from 1991

nick · Postby **nick** » 05 Apr 2010 22:09

I like the propshaft theory since it turns with clutch in or out. I agree wheel bearingss are a long shot. I do remember having a car with a noise differential especially down hill in gear.

nick
'79 TR7

busheytrader · Postby **busheytrader** » 05 Apr 2010 22:53

It's easier to drop the propshaft and eliminate it first before you go looking inside the gearbox and rear axle.

Adam

Hasbeen · Postby **Hasbeen** » 06 Apr 2010 00:14

Nick, one mans rumble is another mans rattle, so I'll mention this,
although it was not really a growl.

One of my 7s had the gear shift extension bushes entirely gone, when
I bought it. This allowed the extension housing to drop down enough
to rub on the tail shaft CV joint.

It had been doing it so long, that the CV had a nice polished ring
around it.

Not really a growl, but it got quite noisy if you pushed down on the
gear stick. Of course, it disappeared if you lifted the gear stick,
which gave the clue to finding it.

Hasbeen

nick · Postby **nick** » 06 Apr 2010 00:27

Hasbeen
The shift bushes are fairly new and I just changed out the gearbox mount so it's all pretty tight. But I'll have a look under and see if I can spot any witness marks.

nick
'79 TR7

Dan B · Postby **Dan B** » 06 Apr 2010 18:46

Over here in the US, we always drive with the hood down. You wouldn't be able see otherwise.

gaz · Postby **gaz** » 06 Apr 2010 19:20

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dan B

Over here in the US, we always drive with the hood down. You wouldn't be able see otherwise.
<hr height="1" noshade id="quote"></blockquote id="quote">

UK car = bonnet [:D] and don't you forget it[;)]

It rides again..... and again wehey!!!!!!!

nick · Postby **nick** » 06 Apr 2010 19:58

Jacked the car for a look at the propshaft. Held the rear flange and moved the shaft to check for feeplay. Found a small amount but nothing excessive. Did the same with the front flange to check the CV joint. Found about the same as the rear. However, when rotating the shaft back and forth with gears in neutral there is a fair amount of clanging going. Sounds like it comes mostly from the CV or the gearbox itself. Selecting forth gear and preforming the same procedure seems to quite things down a bit. I think the U/CV joints are OK but I could see how the assembly may produce some noise during operation. Next I'll try a couple of quick throttle stabs while in gear to see if that produces any noise.

nick
'79 TR7

Beans · Postby **Beans** » 06 Apr 2010 21:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by nick

... Selecting forth gear and preforming the same procedure seems to quite things down a bit ... <hr height="1" noshade id="quote"></blockquote id="quote">
That usually means bearing problems in the 'box itself [B)]

<center>

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

silverseven · Postby **silverseven** » 07 Apr 2010 00:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dan B

Over here in the US, we always drive with the hood down. You wouldn't be able see otherwise.
<hr height="1" noshade id="quote"></blockquote id="quote">

hahahahhahahahahahahhahhhhhhhhhhahahahahahahah

Ron.

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