 | Home > Tdi > Repeating Clunk |
 
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| Andrew95 Member Since: 27 Jul 2022 Location: Midlands Posts: 72   
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Hi Guys,
I am a long time lurker but finally joined up as I am stumped by this problem that has been going on since at least early this year. So I have a repeating clunk, not a 'turn the radio up' more of a 'the axle just left the chat' kind of clunk. It generally only does it when the engine / truck is warm, it has done it from cold but not as often. It also does it in one of three situations 1) when coasting / rolling to a stop with the foot on the clutch (i.e at a roundabout), 2) when driving slowly in 1st (i.e. moving around a car park) and 3) when you are moving slowly in too high gear (i.e in traffic in second when you should be in first). Its a repeating (clunk clunk clunk) clunk which is very loud and appears to be coming from the front. I have the feeling its something that is 'okay' until it warms up and becomes loose. So far I have changed (not all necessarily because of the clunk, some were general maintenance): - Rear A frame ball joint - Front calipers (both sides) - Brake pads (all sets) - Front drive flanges - Front wheel bearings (both sides) - Diff and T-Box output flanges - Replaced clutch slave and master Its currently with a friend / mechanic who has done some other work and now trying to find the cause which has him stumped. He has checked the following: - Front half shafts / CVs (fine) - Front diff (some play, but he does not think there is enough to cause the clunk) - Front prop (fine) - He has also gone over what I have done to check too. - Replaced clutch I must admit I am running out of ideas here. Next idea is to go over all the suspension - check for broken / cracked springs, all the bolts are tight and bushes not worn (they all look fine on first inspection). It could potentially be skipping a tooth in the gearbox or diff (I really hope not), although speaking to my friend he seems to think if that is the case I would probably know about it with diff whine etc. of which there is none. |
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27th Jul 2022 2:46pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421  
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A repeating clunks is generally a CV.
I would remove the front prop shaft and drive it a bit on center diff locked and see if the noise goes away (CVs and front diff are still turning but no load). Also to note that the front CVs need to be shimmed correctly on the drive member so that CVs are aligned with the swivel king pins. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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27th Jul 2022 3:08pm |
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| Andrew95 Member Since: 27 Jul 2022 Location: Midlands Posts: 72
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Ah handbrake - that's the one I missed off the list. I haven't checked it, and I am not sure my friend has (I have asked him to this morning).
This was another main contender for the problem my thoughts being that it would potentially expand when warm causing the problem, at higher gears the speed would be enough to overcome any 'sticking' and the rare cold clunk caused by general sicking of the components water etc. Also, correct me if I am wrong I have only seen the handbrake once, the shoes are only on the sides, so there there is a gap top and bottom which would cause the repeating sound / feel. |
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27th Jul 2022 3:10pm |
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| Andrew95 Member Since: 27 Jul 2022 Location: Midlands Posts: 72
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would a CV not be a quieter clicking sound? turning / steering does not seem to have an effect on it. This really feels like the wheels have just become square and is incredibly loud. |
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27th Jul 2022 3:11pm |
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| markb110 Member Since: 22 May 2010 Location: Guildford Posts: 2643  
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Try looking at the Panhard Rod bush drivers side (UK).
On your own it can look ok, with you looking at it and someone else rocking the steering, any play will be seen straight away. Worth a check.  |
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27th Jul 2022 3:18pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421
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True. On a Defender, the CVs are only for steering movement, not for suspension such as on independent suspension. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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27th Jul 2022 5:51pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20441
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I know you said that you have replaced the A frame ball joint, but were the other two bushes the links to the chassis rubber bushes replaced as well?
I’m guessing that you have, but just thought I’d mention it. I found getting underneath with the vehicle fully secured and pull everything about by hand can be useful to find some issues, bounce the suspension listen and look for any movement. Only to a certain extent will it help but if there is a lot of play in a component it will usually show up or you can hear the knock. $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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27th Jul 2022 8:48pm |
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| Andrew95 Member Since: 27 Jul 2022 Location: Midlands Posts: 72
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Thanks for all the ideas guys. Lee is still certain that the noise / clunk is from the hub area.
He has it for another week or so and hopefully he will be able to sort it. Talking to him last night we have ruled out the following: - Handbrake, - A-Frame (although I am going to check the A-frame arm bushes) - Both front and rear props - T-Box - Clutch - Front diff (slight play but not much) - Front half shafts and CVS - Front calipers Its pretty much down to something swivel related or suspension of some sorts now? If lee can't sort it then I am going to start on the suspension I think. |
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28th Jul 2022 9:22am |
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| Rabbitwabbit Member Since: 31 Mar 2021 Location: Blackpool Posts: 38 
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Check the front shock absorber turret bolts - they're only small, but if loose can make a horrible noise! ----------------------------------------------
1997 Land Rover 110 1981 Range Rover Monteverdi Design Study 1974 Range Rover 1959 Series 2 (Now sold) 1971 Range Rover (Now sold) 1973 Lightweight (Now sold) 1981 Range Rover 4 door (Now sold) 1957 Series 1 LWB (Now sold) 1973 Range Rover (Now sold) |
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28th Jul 2022 2:18pm |
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| Andrew95 Member Since: 27 Jul 2022 Location: Midlands Posts: 72
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So just a bit of an update - I think it might be solved (sort of?!).
We have gone around the whole truck, everything is tight and as it should be. The only things we found were that the circlips were missing on the rear half shafts (thankfully it had HD drive flanges on!), I was surprised by that one as I did it myself a few years ago and I must have totally forgot to put them back on for some reason. There is a slight bit of play in the front and rear diffs but not enough much worry about yet. We ended up stripping down the front axle and found that the drivers side CV had some wear in it (I know I said it was fine in an earlier post, but when it was all assembled). The passenger side looked fine. So we replaced the one CV (we are trying not to replace too much at once to try and work out what it actually is) and its so much better. It still does it but a lot lot quieter. So I think moving forward a front axle rebuild is in order with new CVs and half shafts both sides. |
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11th Aug 2022 10:41am |
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