Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: eddscott on June 03, 2011, 09:58:30 PM

Title: 99 XJ Knocking sound from the rear
Post by: eddscott on June 03, 2011, 09:58:30 PM: Wife was driving the XJ today and noticed it's making a knocking noise from the rear.

Climbed in the back while she drove and it seems to sound louder closer I put my ear to each of the rear wheels - not one or the other. Quite a regular thunk thunk thunk sound. Seems more pronounced the slower you go. It's barely audible up front.

Any quick diagnosis before I take it somewhere - typical! I make plans for buying a few mods and something interesting happens.
Title: Re: 99 XJ Knocking sound from the rear
Post by: Tragic on June 04, 2011, 01:23:44 AM: Is it worse pulling away from roundabouts or around corners? LSD? Sounds like a horse kicking it's way out? D35 clutchplates methinks.....
Title: Re: 99 XJ Knocking sound from the rear
Post by: Nexus on June 04, 2011, 08:28:41 AM: Could also be a need for LSD additive to stop the chatter, might be a cheaper option first off.

Cheers
Nick
Title: Re: 99 XJ Knocking sound from the rear
Post by: Mike Pavelin on June 04, 2011, 08:38:51 AM: Don't let her drive it any more.
Title: Re: 99 XJ Knocking sound from the rear
Post by: eddscott on June 04, 2011, 09:28:53 AM: LOL Mike. I thought that too. Whenever my cars kick up, she always seems to be driving.

Didn't notice it worse cornering - although its harder to hear it when on the gas. When driving around for a while and everything is hot there as always been a faint dull thud when moving off. It's always done it. I did hope it might be something as innocent as a stone in the tyres but no such luck. Also the fact that it sounds like it's coming from both wheels - would that indicate some diff issue? It was quite warm when the wife came home last night after about 7 mile journey.

If I take it to a garage are they going to be able to work out what it is quickly? i.e. an easy spot for a competent mechanic.
Not just replace part after part until it stops knocking?
Title: Re: 99 XJ Knocking sound from the rear
Post by: eastryjeep on June 04, 2011, 10:02:45 AM: Let the kids out of the boot or feed the Trunk Monkey!

Sorry, just couldn't resist.

:hysterical:
Title: Re: 99 XJ Knocking sound from the rear
Post by: eddscott on June 04, 2011, 01:50:51 PM: Found the problem. Very much a school boy error on my part.
Title: Re: 99 XJ Knocking sound from the rear
Post by: Bulldog67 on June 04, 2011, 02:18:36 PM: spill dood
Title: Re: 99 XJ Knocking sound from the rear
Post by: Nosebolt on June 04, 2011, 03:24:29 PM: 5 to 1 it was a loose wheelnut
Title: Re: 99 XJ Knocking sound from the rear
Post by: Bulldog67 on June 04, 2011, 03:45:54 PM: dead cat
Title: Re: 99 XJ Knocking sound from the rear
Post by: isle of man on June 04, 2011, 04:07:30 PM: Radial runout!!
Title: Re: 99 XJ Knocking sound from the rear
Post by: eddscott on June 04, 2011, 10:10:43 PM: Quote from: Nosebolt on June 04, 2011, 03:24:29 PM
5 to 1 it was a loose wheelnut

:icon_redface:

I'm such an arse! I took the rear wheels off a week or so ago to fit some mudflaps and I always give each nut two cracks. Took the Jeep to a client who owns a garage and ask him to take it round the block for a listen. First thing he did was check the nuts and they were very loose. Only one was tight.

Very red faced! Still, at least it's nothing more serious than ametuer hour with the spanners.
Title: Re: 99 XJ Knocking sound from the rear
Post by: Nosebolt on June 04, 2011, 11:27:27 PM: :ace: what did i win?
Title: Re: 99 XJ Knocking sound from the rear
Post by: Bulldog67 on June 04, 2011, 11:29:25 PM: membership into the 'I have just exposed myself as havin had it happen to me' club
Title: Re: 99 XJ Knocking sound from the rear
Post by: Dutch on June 05, 2011, 09:57:21 AM: Quote from: Bulldog67 on June 04, 2011, 11:29:25 PM
membership into the 'I have just exposed myself as havin had it happen to me' club

Cult of the Bulldog comes to mind IIRC ..... :hysterical: