 | Home > Puma (Tdci) > Diesel mystery knock on the highway |
 
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120  
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Here's how I would proceed:
1. run the engine, open the bonnet, see if the injectors are perhaps loose and dance about. Sometimes the H-shaped brackets loosen and cause knocking. Easy fix, new screws, new brackets, tighten to spec, done. 2. Have a look at the injectors themselves. Remove the engine cover, and inspect the spot where they enter the engine. See any soot or smell diesel? The copper washers on the injectors might be the cause, apparently a very common thing for Pumas. It's no DIY fix (for most), since everything has to come apart, injectors pulled, might need new fuel lines , etc. Yet still cheaper then new injectors 3. Try a diesel leak-off kit, see if the injectors are out of tolerance. If you're mechanically inclined, you might be able to do it yourself. Presumably it would show with the kit if you had the same trouble as I had with the injectors. New injectors cost an arm and a leg, I spent the equivalent of 28k Rand on the whole procedure. Some people only exchange the leaking injectors, opionions are split on this though. Good luck, keep us posted how it unfolds - |
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13th Mar 2017 3:00pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300  
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I've not used the defender much recently but just completed a few hundred miles and yep the clatter is there.
to my ears this is exactly the same as I've had on / from new and I'm now inclined to believe it's the clutch plate - or at least transmision. there's other symptoms as well that to my mind suggest the clutch isn't as it should be. to reiterate what the symptoms are; cruising along at circa 50 ish / 1850 rpm in 6th; foot off gas and no noise very light application of throttle to maintain speed on a flat and clatter clatter heavier application of throttle to either accelerate OR maintain speed due to incline no noise I suspect the clutch isn't damping on a very light load? oh bloody hell.....or the adapter shaft again? THOUGHTS PLEASE? I personally dismiss the engine as the sound has mostly been there from new and yet the engine now has 100k miles and is basically original bar turbo and maf, map and egr. ie as noted previously the injectors and seals are original. |
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1st Aug 2019 2:34pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17430  
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Turn the radio up and try not to worry, Madness lies down that path.
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1st Aug 2019 3:24pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300
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you're not wrong.
BUT I do find there's a lot less madness when you know what's causing something even if you can't fix it  |
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1st Aug 2019 4:41pm |
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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4695 
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If it is intermittent it could be those pesky bonnet hinge inserts. Any wear in them and they allow metal on metal and the noise seems to come from anywhere except the bulkhead.
If you have a sliding tow hitch check that there is no slack in the tow hitch bracket. There was in mine and it took me ages to track it down .I put some rubber from a tube between the slider plate and the hitch to solve mine. Grasping at straws I know but it is usually something simple. 1982 88" 2.25 diesel 1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai |
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1st Aug 2019 4:54pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300
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in my case it's almost certainly engine or transmission.
as the noise has been similar on / off over the last 100k miles I'm pretty damn sure it's not the injector seals as a- I wouldn't have expected it to be an issue from day 1 and b- I would have expected it to get worse. personally I'm thinking the friction plate is unable to damn the engine input on virtually no load. as already said on significant load and upwards it's not a problem nor is it on no load? |
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1st Aug 2019 6:23pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1628  
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find a good steep hill in third gear and see if it slips
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1st Aug 2019 10:51pm |
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| parktag Member Since: 30 Sep 2008 Location: Brittany Posts: 366  
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I've had the same noise for years. When maintaining a constant speed or increasing speed gently there is a rattling noise. I first thought it was the injectors but they were fine. Earlier this year a clutch spring broke so i assumed that had been the problem all along so i fitted an upgraded clutch expecting it to be nice and quiet but the rattle is still there. It's probably an internal gearbox rattle of some kind but because i'm almost deaf i can't trace where it's coming from. When it goes bang i'll know what to fix. 130 crew cab
98 V8 Disco |
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2nd Aug 2019 2:07am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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I've identified my problem in the meantime:
the injector seals were leaking, and albeit I had the job done at a garage, they did it badly and skipped one injector. Once all injector seals were brand new, the problem subsided. |
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2nd Aug 2019 8:59am |
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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4695
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Caterham, would it possibly be that gear stick vibration problem? Next time it happens just put your left hand over and hold the gear stick and see if that stops it. There is a thread here about the gear stick rattle and how to fix it.. Mine used to rattle when accelerating in the high 5th and 6th gears also when accelerating up a hill. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai |
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5th Aug 2019 11:32am |
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| Johan H Member Since: 12 Oct 2017 Location: Helsingfors Posts: 36 
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Has there been any new information as to where one could look for the cause of the knocking.
In my case the knocking/ticking definitely comes from the engine and it is not rpm related. Here's some background: 2008 Puma 170 000km the engine runs smoothly including smooth idle, also when cold. The car has had an EGR delete & blanking plate installed During the winter I have had issues with loose injectors, which I tightened using new washers and bolts, I also reamed all the seats. One of the injectors had a swollen tip, and this one I replaced with a new item. I At least some of the knocking was cured by this. At first It was completely gone, but after a short while I started hearing it again driving with partly opened throttle. Now it has grown as to the point you can clearly hear it all the time when opening the throttle lightly or letting go of the pedal. I had a look yesterday, the injectors do not seem to be loose. A few days ago I noticed a loss of power, which in the end turned out to be seized vanes on the turbo, I seem to have cured this (at least temporarily) by moving the arm up and down for a while. During the power loss the knocking/ticking got louder, this is my feeling, I am not absolutely sure about this. Could there be a connection in these two incidents? Any advise is greatly appreciated. |
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28th Apr 2020 12:30pm |
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| Johan H Member Since: 12 Oct 2017 Location: Helsingfors Posts: 36
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No new information about this?
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1st Jul 2020 9:16pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282  
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If your injectors were loose I bet you damaged the injector seats on the injectors themselves. I had this recurring problem and it was old cured with 4 X recon injectors and a complete strip of rocker cover to clean seats properly and renew all washers bolts etc.
My head seats were spot on, but it was the injector seats that were knackered and only confirmed on a test machine. Now: 2010 2.4 TDCi 110 Utility Wagon Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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2nd Jul 2020 7:25pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300
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sorry spud - didn't notice this before. Mine seems fine these days. I believe all my issues were related to the transfer box going into diff lock. 
I'm amazed at some of the symptoms it caused - some obvious - some less so. anyways all good |
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3rd Jul 2020 11:20am |
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