|
|
2010-08-04 19:59:34 |
Pot hole "Clunk"
|
|
Garfield Schexnayder
Jaguar Car Club of North Florida *
forum user since
2009-12-02
|
While driving in my 2005 XJ8L with 41k on the odometer, through America's ever so smooth streets, on occasion, there is a pot hole--------just on occasion mind you.
If the pot hole happens to be unavoidable and where the left wheels make contact, the normal "Thump" sound can be heard. If the pot hole is on the right side of the road where the right wheels make contact, the normal "thump" is heard when the front wheel passes over, but a harder "Clunk" is heard as the right rear wheel makes contact. Not through a small hole, but through a "try to avoid" hole---almost as if the wheel, or action, is bottoming out. The same sort of sound one hears when a shock might be bad--
I've had the car up on a rack and have examined everthing and all looks normal. Someone mentioned checking the sway bar attaching points--looks good. All bushings look servicable----everything looks fine with a pair of non professional, but mechanically capable trained eye's.
Sitting on a level surface, the car is level, loading the car produces the right load leveling actions. Just can't think of anything else to look at or for.
Any recommendations appreciated. Steven, maybe your light comes on..
Garfield
05/XJ8L
|
|
|
|
|
|
|
|
|
2010-08-09 11:54:28 |
Re.: Pot hole
|
|
Steven Petry
Jaguar Association of Greater Indiana *
forum user since
2007-02-03
|
Edited on 2010-08-09 12:04:44
Garfield,
Your most likely cause is one of two things, the lower air spring bushing, or the air spring itself. Neither one are do it yourself items. Below are excerpts from Jaguar communications from sometime in 2007:
Concern:
Analysis of warranty claims and returned parts has shown a rise in
warranty claims for rear damper replacement where the root cause has
been established as wear of the lower bushing.
Cause:
Rear air spring lower bushing wear.
Action:
Dealers are reminded of the service procedure located within GTR
Section 204-01 Removal and installation of the Rear Lower Arm
Bushing SRO (64.32.03) along with special service tools released. This
is to avoid replacing the complete rear damper assembly and is the
subject of Policy Letters JOSC 404 and JHSC 553.
************************************************
Concern:
New air spring/dampers are now available from Unipart
offering improved levels of noise performance and durability
Action:
The revised air spring/dampers are now available for the
XJ range with the following part numbers:
Rear Comfort: C2C31014
Rear Sport : C2C31015
Front Comfort: C2C31016
Front Sport: C2C31017
Please note: Reference the current Warranty Policy, these parts are to
be replaced as single items.
Remember, I said "most likely', it should still be gone over closely by someone to try to determine for sure the root cause.
Here is the guide to determine whether to replace one or both air springs, should that be required:
During the warranty life of the vehicle the failed part only will be changed, provided the following criteria are met:
• Only one shock absorber/air spring/combined air spring and damper module
across an axle exhibits a defect.
• The part number of the replacement shock absorber/air spring or combined air spring and damper module is common with the one being removed.
• The vehicle has completed less than 60,000 miles (96,000 kilometers).
It is an unusual occurrence for both shock absorbers/air springs to fail.
If, after replacement of the failed part, the remaining shock absorber/air
spring/combined air spring and damper module are also found to be faulty, this subsequent repair must be carried out and a second claim submitted.
This criteria would mean yours would require both air springs should one fail, due to the new part having a different part number than the original.
Sorry for the delay, have to get away every once in a while, you know.
Good luck,
S Petry
'95 XJR
'97 XK8 Conv.
|
|
|
|
|
|
|
|
|
2010-08-09 18:05:58 |
Re.: Pot hole
|
|
Garfield Schexnayder
Jaguar Car Club of North Florida *
forum user since
2009-12-02
|
Thanks Steven,
Let say, for conversation , that the airspring is the cause, would the levelling system still work on that wheel?
I've looked with a keen eye at the rubber bushing, but it looks fine. Of course, not ever seeing a bad one, it's impossible to say it isn't
Garfield
|
|
|
|
|
|
|
|
|
2010-08-10 11:29:02 |
Re.: Pot hole
|
|
Steven Petry
Jaguar Association of Greater Indiana *
forum user since
2007-02-03
|
Garfield,
The air spring is a combined unit, also housing the computer controlled damper. So the air spring could be functioning just fine, yet the damper be making noise. Also, the bushing could be noisy and you just can’t always tell by looking, it may take road forces to produce it.
But let’s not get ahead of ourselves. What you need is further diagnosis by someone competent, preferably with a device called an Electronic Chassis Ear. These clip on various suspension components and allow a technician to drive the car and trace the sound to its source, which could turn out to be nowhere near the air spring. Or, it could settle once and for all that it is the spring.
I think you were one who said you had a healthy jaunt to get to the dealer. If so, try to find a local shop that might have the Chassis Ears, which is what you really need.
Good luck,
S Petry
'95 XJR
'97 XK8 Conv.
|
|
|
|
|
|
|
|
|
2010-08-10 11:39:39 |
Re.: Pot hole
|
|
Garfield Schexnayder
Jaguar Car Club of North Florida *
forum user since
2009-12-02
|
Good point Steven, I've heard someone here talking about the use of the ECE, so I'm sure there is one in the area, so I'll take your advice and see if I can get that done.
Thanks as always for the help.
Garfield.
|
|
|
|
|
|
|
|
