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-   -   Side to Side "Klunk" (http://www.clubcobra.com/forums/era-speak-bob-putnam/115704-side-side-klunk.html)

LG57 05-23-2012 08:15 AM
Side to Side "Klunk"
 
I have ERA 134. When I make a vigorous turn to either right or left, I'm hearing a "klunk" noise from the rear of the car. Could this be the baffles in the fuel tank?

Grubby 05-23-2012 03:59 PM
A hard klunk like a sledge hammer on an anvil would make me think differential or rear suspension. A tinny klunk would make me think fuel tank.

Can you lean against the rear quarter and work the car back an forth and make it happen.

Does it do it when low on fuel and when full?

John

patrickt 05-23-2012 06:33 PM
Quote:
Originally Posted by LG57 (Post 1191646)
...I'm hearing a "klunk" noise from the rear of the car.
Before I did anything else, I would do this:

Quote:
The filler and drain plugs are ½” square. Fill to about ½” below the bottom of the hole with Moroso climbing gear lube, SAE 90, part number 34800, mixed with 4 to 8 oz. of Amalie limited slip additive (part # 505-6775). If the above are not available, you may use 80W-90 GL5 lubricant with an equivalent limited slip additive. If the limited slip seems to be sticking (ratcheting around sharp corners), drain and refill, replacing the Amalie additive with 2 tubes of GM additive 1052358 or MOPAR additive 4318060AB.

Grubby 05-23-2012 07:05 PM
+1 with Patrick if the noise is apparent when making slow circles in a parking lot. If not I doubt it is the clutch packs.

John

PDUB 05-24-2012 02:03 AM
Look in the trunk to see what tools you left sliding around in there;)!


If you lift it, are the rear suspension components all tight?

LG57 06-06-2012 03:28 PM
Well it took me a while to get back to working on this problem. Thanks for the suggestions. So far, no "junk" in the trunk, can't make it make the noise by pushing against the sides. Got the left rear wheel off today and measured .010" in/out movement in the hub carrier. Shattered my plastic deadblow hammer on the right rear knockoff, so I'll be ordering the American 6lb. lead hammer as suggested in another thread here. The saga continues.....

Larry

LG57 06-24-2012 01:17 PM
I was able to get more done yesterday and today. After removing the right rear wheel, I measured movement in the lower outer pivot at .010" left side and .015" on the right side. is this excessive? This is measured with a dial indicator at the top outboard side of the wheel mounting surface.

Also, While looking things over around the differential, I found the shim at the lower left rear loose and the right was missing completely. Reinserted the left shim and replaced the right shim with .060" shim and tightened everything.

Test drive, still clunks. Filled with gas, still clunks.

Is the movement noted above excessive? Should I rebuild the lower outer pivots? Is this even something to be concerned about? Help!

Larry

strictlypersonl 06-24-2012 03:18 PM
Besides the manual, this supplement section has many service hints.
Here's the page describing the lower pivot adjustment:
Adjusting Jaguar hub carrier lower pivot

legenmetals 06-24-2012 05:08 PM
Check for a loose rear swaybar while the car is on the ground or a four post lift.

Jeff Frigo 06-24-2012 10:02 PM
I have an early ERA car, does the same thing. It is the float in the tank, no worries.

Le Mans 06-25-2012 01:48 PM
Hi

When wheel lifted this play is Normal with Jag unit. The upper arm is the driveshaft. You Should measure the play the weight on the wheel. I agree below that you Should see the condition of the lower reaction bars. See Also brake calipers.

CHANMADD 06-25-2012 02:14 PM
A clunk kinda....manifests itself, or maybe more like a clicking if the sideshafts come slightly loose at the rear inboard disc mounting. Put it in gear with the park brake of and rock back to front . John

LG57 08-30-2012 10:34 AM
I found the source of the "klunk"! The baffle assembly in the fuel tank has broken loose and is sliding around. Now to find a welder that will fix this for a reasonable cost.

Larry

FWB 08-30-2012 10:41 AM
sounds like a new tank is in your future. welding repairs on a previously used gas tank. in my neck of the woods, are a hard sell to any welder.

its not the welding but the KABOOM that'll get ya...


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