 | Home > Technical > Clunk/bang from gearbox/transfer box |
 
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| SimonDavies Member Since: 15 Mar 2012 Location: Swansea Posts: 244   
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Evening all,
I have a nasty clunk when lifting off the clutch from what I believe to be the gear/transfer box area. It occurs most changing from 2nd to 3rd although I have had it in other changes. I rarely get the clunk when changing down the box. I can actually feel the force through the gearstick. Driving home tonight, there was a delay where the clunk would occur a few seconds after the change, when back on the throttle. The worst occurrence tonight was when I got home and began to reverse up my drive which is about a 40° slope when BANG from (what I believe) gear/transfer box. I immediately dipped the clutch and went to reverse again with no problems. My defender is a 2.4 90. 2010 vehicle with 48k on the clock and has not had a clutch to my knowledge. I welcome all responses. I have an idea of possibilities but wanted to hear other people's views. Simon |
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20th Oct 2015 7:47pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3645  
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as Alby said probably the transfer shaft, at your mileage the clutch plate springs will be as good as dead as well, listen for a rattling when stationary, in neutral with the engine running at idle that changes when you press and release the clutch. My 2011 needed both doing at 13000 miles some last longer. If you are having the clutch done the shaft is not a lot of extra work, do a search on here there are loads of threads on the subject. DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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21st Oct 2015 5:31am |
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| SimonDavies Member Since: 15 Mar 2012 Location: Swansea Posts: 244
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Thanks both for your replies. What replacement parts are used? Genuine or someone such as Ashcroft?
I limped it in to work this morning but the problem has become too bad to run anywhere else. I am now getting loud noises and a jolting motion when going on the power and back off. It's as if there is a lot of drive to take up and then it grips (maybe worn splines). Simon |
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21st Oct 2015 9:14am |
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| tatra805 Member Since: 16 Aug 2011 Location: Dolany Posts: 436  
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Just throwing in some thoughts before you jump on the adapter shaft replacement, mine was barely worn at your mileage.
My worn clutch went with a "bang" but was signalling this for 30k km by rattling sounds getting gradually worse. Did you check your drive flanges? I had them go in once but also gradually jumping teeth when pushed. While at it check diff play also. Other reason is that i always hear that the adapter shaft goes "all of a sudden" with instant no-drive as result. just 2cents  |
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21st Oct 2015 9:58am |
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| Browny90 Member Since: 20 Jul 2015 Location: Derbyshire Posts: 183 
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Check all of your prop shaft UJ's, and the back lash on the diffs.
see if the noise still occurs when the diff lock is in. maybe jack up one wheel, put it in gear with the engine running at tickover with the diff locks out. do one wheel at a time and see if you get any odd noises, (I would get someone competent to sit in the drivers seat with their foot over the brake) and look underneath from the side, dont go underneath, even if its on an axle stand. If its more of a 'crunch' than a 'clunk' then you're probably looking at a syncromesh gone between 2nd&3rd gear. when they go, it can feel like a good jolt through the gear stick. Keep us updated  My 1986 90 is currently on a full rebuild, with new chassis, Paint etc.. Very much a hybrid, TD5 Chassis, tub & bulkhead with a 200TDI and LT77 GB Painted in Stornoway Grey 2 years off the road, but getting close to completion now |
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21st Oct 2015 10:19am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17457 
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I'm a little surprised that you still have drive at all if it is the output adaptor shaft problem, based on what you described, and have a nasty suspicion that it could be a gearbox or transfer box problem.
Does it do it in low ratioas well as high? There are conditions under which the handbrake can cause banging, where the shoes are snatching on the drum, whcih typically happens if the handbrake has been adjusted too tight. Does the handbrake work OK? How many clicks from fully released to hard on? |
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21st Oct 2015 10:52am |
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| SimonDavies Member Since: 15 Mar 2012 Location: Swansea Posts: 244
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I am going to check the drive flanges tonight. It's obviously the easiest to start with although it does seem to come from the box area.
Whilst at it I will check diff play and ujs on the prop. I haven't tried it in low range of difflock engaged yet so providing I can get off work early enough I will try all this later. Browny, that's a good idea to check each wheel individually. I really hope it isn't in the gearbox itself. Other gears have started to make a noise also. Blackwolf, The handbrake hasn't been touched since I've had the 90. It's always been 4 clicks at a push. Can the shoes become detached within the drum? Thanks for the replies. |
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21st Oct 2015 1:26pm |
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| SimonDavies Member Since: 15 Mar 2012 Location: Swansea Posts: 244
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Double post.
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21st Oct 2015 1:26pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17457
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I've never heard of that happening and think it is unlikely unless an incompetent has assembled it. I suppose that it is just possible that a pull-off spring in the handbrake has broken, but it would be very unusual. The handbrake is an old-fashioned leading/trailing shoe arrangement with no positive self-centring mechanism, so the two shoes can inevitably rattle about a bit. The usual handbrake knock is caused when the leading edge of the leading shoe (which shoe will depend whether you're going forwards or backwards) touches the rotating drum and there is enough self-servo action to cause the shoe to snatch and release. It is hard to see why this would start happening after a time unless the handbrake had been adjusted or at leat one spring had broken, so that fact, together with the fact that 4 clicks is generally slack enough not to cause the effect in the first place tends to rule this one out. |
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21st Oct 2015 2:42pm |
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