 | Home > Tdi > Bad knocking 200tdi - help identify cause please. |
 
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 278  
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My 200tdi Defender has developed a bad knock - can anyone identify a probably cause from the video.
https://www.dropbox.com/s/zlqe1hlze55hulz/rumbly%20200tdi.mp4 What should I be checking? |
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1st Sep 2013 11:07pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1568  
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What's it like on power??
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1st Sep 2013 11:15pm |
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| Skye_Rover Member Since: 30 Aug 2013 Location: Skye Posts: 85 
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I would also add the question, "When was it last fueled, and what went in?". If the knock is consistent across the cylinders, it might be a misfuel (petrol or bad bio) that has led to this.
Might be a trick of the camera, but when you took the oil cap off, it appears that the visible rocker is not operating consistently? This might be down to the frame-rate on your camera, but there might be a clue there...a slack timing belt or failing tensioner. If you were this end of Scotland, I'd put some gear on and find it by science!! Roads? Where we're going, we don't need roads. |
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1st Sep 2013 11:42pm |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 278
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Thanks for the replies.
To answer some of the questions - I have not noticed any reduction in power, but it has not had much use in the last 4-5 years (about 4k miles) but has been more regularly used in the last few weeks, so has had several tanks of fuel - so I doubt it is bad fuel. It has been making the noise for about the last 1000 miles. It gives a fairly big puff of smoke on start up and is smokey for about the 1st 10 secs when cold (or more exactly, after it has been standing for anything more than a couple of days). It is also a little lazy to start, but it is not the battery has this has been replaced and regularly charged. It is probably due a timing belt, so the idler/tensioner might be a possibility. I have tried the long screwdriver to the ear trick to try to identify the area but having never done it before I am not sure that I was doing it right and could not be 100% sure on what I am hearing. |
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2nd Sep 2013 5:40am |
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| pope10001 Member Since: 15 Oct 2011 Location: Dulverton Posts: 489 
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This is going to sound stupid but it happened to me recently. Going up a mountain in the Pyrenees all of a sudden my 200Tdi sounded exactly like yours. I immediately thought the engine had gone and was wondering how much more damage I would cause getting it off of the mountain. On inspection under the bonnet it wasn't immediately obvious but one of the clips holding the turbo hose on had snapped and the turbo hose was slightly hanging off beneath the turbo. I couldn't see the hose clearly in the video. It might be worth a check. Good news for me, reattached the hose with a new clip and carried on with the holiday.
Regards, Mark |
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2nd Sep 2013 7:34am |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610 
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As Pope stated but taking it a little further if it has sat for a prolonged time with little or no use it could well be that your rubbers may have dried out or perished. Go over the lot with a fine toothcomb paying particular attention to where they are clipped/secured.
Hope it's that simple for you.  If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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2nd Sep 2013 8:21am |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 278
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I really hope it is something "silly", I don't really have time or money at the moment to embark on an engine strip. Hopefully I will get a look in the next couple of days.
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2nd Sep 2013 10:37am |
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| Skye_Rover Member Since: 30 Aug 2013 Location: Skye Posts: 85
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That would rule out the fuel itself, although the fuel system may have degraded.
Nothing unusual there. All Tdi's except the EDC300 smoke on initial start. That is the way that the pump is calibrated to cope with the cold start (even where a GST unit is fitted to the side of the Bosch pump). But lazy starting is pointing to a fueling/timing issue, although (I hope I'm wrong on this one) it is also the early indicator of a head gasket leak between cyls 2&3. Any signs of gas being blown into the coolant expansion bottle?
Very difficult with LR engines to use the Engineer's stick method, not if you don't want to be deafened by a Defender! I would give some serious consideration to popping the FIE drive access plate off the front of the timing case, and having a look to see if the FIE timing is anywhere close to where it should be at TDC. A drill bit is sufficient to act as a timing peg, and you can then use a torch up through the flywheel housing timing hole to see if your slot in the flywheel is lined-up. That would give you peace of mind in the very short-term, without having to remove the whole front cover plate. Roads? Where we're going, we don't need roads. |
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2nd Sep 2013 9:39pm |
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| Skye_Rover Member Since: 30 Aug 2013 Location: Skye Posts: 85
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Good idea, especially the hose that forms the elbow just after the compressor outlet. Worth removing the pipe from one end or another and looking inside with a torch to see if the hose has delaminated. Normally these things self-heal at rest, and only go wrong under high loads and/or altitude, but it is the weakest part of the induction system, and plenty of decent aftermarket silicon hoses to replace it. Roads? Where we're going, we don't need roads. |
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2nd Sep 2013 9:45pm |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 278
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So a wee update ... a few months have passed and I have been too busy to do anything about the Defender. I decided a couple of weeks ago that enough is enough and put it into a local independent specialist for some investigations.
I decided that it needed a timing belt regardless of anything else, so instructed the garage to start with that ... and they found that it was trying to destroy its own engine!!! The woodruff key on the timing gear was "mangled" (garage mechs words) and was meaning that the timing was adjusting itself at will by about 5 degrees. They also discovered the woodruff on the crank pulley was also mangled and had to cut the pulley to get it off (after bending the arms on their hydraulic pullers!) Now, it is running as it should .... all I need now is some time to enjoy my Defender again  |
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25th Nov 2013 11:01pm |
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