Results 1 to 15 of 15

Thread: Disco diesel knock

  1. #1
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Disco diesel knock

    Hi there all I have had a diesel knock on my 300 Tdi auto for nearly a year now that I have been trying to get rid off by advancing and retarding the timing.
    Took it to a diesel specialist and he aid that the injectors were shot so I bought a recon set from a chap on eBay with new tips fitted better everything till the motor warms up then it starts knocking and tapping like crazy it's not as bad now but it's still there.
    I've adjusted the advancement on the pump dropped I'n a couple off injector cleaners full tank off diesel and it's slowly getting better but what I cant understand is why it's not knocking when cold has any one any ideas off what to try next before I have the injection pump overhauled on the disco which would cost me more then the disco is worth as this is what the diesel guy has said would need to be done next to the tune of 800 plus vat.
    I've checked the tappets and reset them checked the cam timing replaced the injectors for recon ones with brand new tips cleaned the sedimenter and also changed the fuel filter any more ideas would be great thanks I'n advance Micheal
    if its not broken leave it alone
    if its stop leaking then its empty

  2. #2
    Apprentice colinl's Avatar
    Join Date
    1st Dec 2009
    Location
    Ashton-under-Lyne, United Kingdom
    Posts
    381
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    if yours has got the EDC system i think that it may have sensors on the engine that adjusts the timing although i am not 100% sure.Does it smoke or is it underpowered?
    94 discovery 300tdi manual
    94 discovery 200tdi manual weekend toy
    PROUD MEMBER OF THE YCHJCYA2PDTHFH CLUB

  3. #3
    Engineer bananahead's Avatar
    Join Date
    19th Dec 2007
    Location
    Leeds
    Posts
    4,826
    Reviews
    Read 0 Reviews
    Blog Entries
    2

    Default Re: Disco diesel knock

    Im sure he has posted before about "tweaking" the injector pump, so chances are he has burnt out a piston.

    Don't take life too seriously. You'll never get out of it alive.
    1998 Discovery 300TDI (Disco PEW) (staying with friends )
    1988 Range Rover Hybrid 3.5V8 EFI 88" (Boris)
    2001 Discovery TD5 ES (Reginald)
    1999 Renault Clio RT Auto 1.6 (for the mrs)

  4. #4
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    Nope non edc on mine with no sensors on the engine. And the pistons are fine took it around to a trusted engine reconditioner who has a bore scope and checked inside the engine and it's fine even showed me the video. This has only happened since January off this year when I tried bio diesel it didn't work at all added v power diesel it calmed down and then came back but after dropping I'n two bottles off injector cleaner the noise dissapered for the tank and then came back again the only way to keep it quite was to carry on using bio diesel but now I have the new injectors fitted I want to go back to using diesel the noise isn't there when cold the gets progressively noticeable when the engine is warm but after a run unto Scotland and back it was fine left it over night the noise was there the next day.
    Strange thing is there is no smoke at all even before the injectors were changed there Was no loss in power at all if a piston or a valve had burnt out there would be a loss I'n power or bad fuel consumption
    if its not broken leave it alone
    if its stop leaking then its empty

  5. #5
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    http://i670.photobucket.com/albums/v...sedimenter.jpg
    http://i670.photobucket.com/albums/v...mg_037fuel.jpg
    this is what ive been getting out off the fuel filter and sedimenter over the 3 years that ive owned the car
    if its not broken leave it alone
    if its stop leaking then its empty

  6. #6
    Disco 1 TDi specialist zollaf's Avatar
    Join Date
    7th Mar 2010
    Location
    pembrokeshire
    Posts
    12,052
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    i think i would drop the fuel tank out and give it a good clean out myself, as that doesnt look very healthy. looks like a bit of the old black death in there, possibly caused by water or veg oil, or bad bio diesel.

  7. #7
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    well looks like im goping to be very busy tommorow then cleaning that out then.
    i was wondering why because apart from this year the disco had been run on diesel and then as in the prevouis post i could only get it to run fairly quite was to keep using the bio diesel. the prevouis owner had run the disco on wvo for quite some time before i ran nothing but diesel untill i treied bio diesel looks like il be sticking to normal diesel
    if its not broken leave it alone
    if its stop leaking then its empty

  8. #8
    Disco 1 TDi specialist zollaf's Avatar
    Join Date
    7th Mar 2010
    Location
    pembrokeshire
    Posts
    12,052
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    waste veg oil you say. i always get worried about people using waste veg oil, or any veg oil for that matter, if they dont know how to do it properly. wvo has to be filtered to remove the big lumps, then stood to settle the fat, then washed to dilute the acid, then dried. only then can it be used safely. so many people just run it through a filter and throw it in their tank. the problem is it is still wet, and that moisture is acidic. this will eat metal things, like injection pumps. it will also allow fungi to grow( black deaty) which will clog everything up. even new veg oil has to be kept dry as it is hydroscopic and will cause the same problems, especially when people buy a 1000 litre ibc of it, and dont use a water seperator on the air inlet as they use it.
    i would bleach wash or steam clean the tank, then leave a hair dryer pointing in it for a few hours to dry it, and blow through or replace the fuel lines, clean the sedimentor and fit a new filter. if the problem is still there, try a bit of new veg oil from a sealed container in it. if this cures it, it could be a bit of wear in the pump, but the thicker veg oil will help to seal it and temporarily cure it, helping to diagnose the problem.
    incidentally, you get the same problems with bio diesel, depending on how it has been made and where the veg oil cam from/ how it was treated.

  9. #9
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    well i know that i wont be using bio diesel again with the problems that i have been having i ran svo for two monthe just to try it but i found diesel cheaper. i dont think that the black stuff reached the engine though as i have a defender fuel pump fitted with the removable filter in there and that was pristine clean i think that the fuel filter and sedimenter have done there jobs. yes the last owner ran it on anything he could get his hands on when i first serviced it the fuel filter had 3 mm off diesel ontop off it the rest was solid fat since then i have been getting the crap from the tank the sedimenter was the same state cleaned it out every 2 months and changed the fuel filter too i just hope that by washing out the tank and the rest off the system and clean diesel going thourgh the system it might come back right
    if its not broken leave it alone
    if its stop leaking then its empty

  10. #10
    Apprentice colinl's Avatar
    Join Date
    1st Dec 2009
    Location
    Ashton-under-Lyne, United Kingdom
    Posts
    381
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    like Zollaf says you have probably damaged the pump internals and using bio diesel is only "masking" the problem! you will find that the bio has rotted the seals inside the pump and the only cure is a recon pump or known good second hand pump. I have used bio in my 300tdi and found it to be considerably quieter until other people were telling me stories of gummed up rings and pump wear.The amount of cash you save using this fuel is ok at first until something like this happens and then it suddenly becomes very expensive.
    Hope you get it sorted!
    94 discovery 300tdi manual
    94 discovery 200tdi manual weekend toy
    PROUD MEMBER OF THE YCHJCYA2PDTHFH CLUB

  11. #11
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    yeah i agree with you there might be the problem but it goes away with injector cleaner added to the fuel but im not getting any other syptoms off a worn pump no running on or a loss in power so im hoping that its not th pump but it looks like its going to be a trip to the diesel guy again for a second opion on the injection pump. with it being the early auto the pump wont be cheap to replace second hand im hoping that with the diesel it will start to either sort its self or go pop completley
    if its not broken leave it alone
    if its stop leaking then its empty

  12. #12
    Apprentice
    Join Date
    25th Oct 2009
    Location
    rural somerset
    Age
    58
    Posts
    488
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    id be inclined to trawl the breakers for a clean tank and an injection pump. silly to fit a new pump that will cost about the same as a complete vehicle.

  13. #13
    Consultant listerdiesel's Avatar
    Join Date
    17th Apr 2009
    Location
    Rushden Northants
    Age
    68
    Posts
    7,651
    Reviews
    Read 0 Reviews
    Blog Entries
    1

    Default Re: Disco diesel knock

    If the pump has the advance/retard worn/rusty then you will start getting overadvanced injection, together with the knocking. Adding injector cleaner actually increases the volatility of the fuel which then runs OK for a while.

    As others have said, get the tank cleaned of any growth, get the pump overhauled. An overhaul with new element block assy is going to be the thick end of 450+ from a decent pump shop, a secondhand pump might turn up that is good, but so many 200TDi and 300TDi engines are going into hybrids that the engines and their pumps are starting to get somewhat rare.

    Peter
    June 1999 Disco 4.0 V8 Manual GS on LPG
    email: diesel@easynet.co.uk web: http://www.stationary-engine.co.uk
    V8 Rebuild: http://tinyurl.com/2vee7vz Sunroof: http://tinyurl.com/39d9dfn R380: http://tinyurl.com/32v2r3h
    OBDII Reader: http://tinyurl.com/36r2bv5 LPG Valves http://tinyurl.com/28v943q ABS Mod 19/12/2009 99543Miles
    D1 Image Archive: http://tinyurl.com/2u2sr9d D2 Image Archive: http://tinyurl.com/3x72fd7

  14. #14
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    What makes mine even rarer is the fact that it's a non edc manual Pump for an auto disco I was Reading on the websites that it's not advisable to run wvo that's been used by the last owner off the motor and that bio diesel is a solvent and will wash out any muck and crap from the tank just looked I'n the bottom of the tank thourgh the sender unit hole and there was quite a bit off muck I'n the bottom i scooped out as much off the muck as I could with out losing the fuel that is I'n there. A pump overhaul doesn't sound very cheap at all I was kind off hoping that I could try and save the pump it's got a fuel filter and the defender style lift pump fitted to it with a filter I'n there too so hoping to catch what is left I'n the tank I have been quoted over 750 plus vat for the pump to be overhauled my question is could a manual injection pump be retro fitted onto the block
    if its not broken leave it alone
    if its stop leaking then its empty

  15. #15
    Engineer micheal's Avatar
    Join Date
    18th Apr 2009
    Location
    keighley west yorks
    Age
    33
    Posts
    1,208
    Reviews
    Read 0 Reviews

    Default Re: Disco diesel knock

    Quick update I have been playing around with the timing and retarded it down a touch more it's ticking over at the right revs (lower then a thousand rpm) it's sounding much better From cold and it even goes much better then it ever has done Im going run it a couple off days and see how it goes and hopefully it's just a combination off crap fuel and over advancement that is causing me the problems with the tapping
    if its not broken leave it alone
    if its stop leaking then its empty

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 200Tdi Diesel Knock
    By spitfireman in forum Discovery Series I and II
    Replies: 3
    Last Post: 25th Jan 2012, 09:13
  2. D1 diesel knock cured
    By micheal in forum Discovery Series I and II
    Replies: 0
    Last Post: 9th Nov 2010, 23:42
  3. 200 TDI Diesel knock - any ideas?
    By chief tdi in forum Land Rover Defender
    Replies: 5
    Last Post: 10th Jan 2008, 18:54
  4. Defender 200 TDI Diesel knock - causes?
    By chief tdi in forum Land Rover Defender
    Replies: 1
    Last Post: 6th Jan 2008, 16:37
  5. Diesel Knock
    By Georgepaul in forum Land Rover Discovery
    Replies: 5
    Last Post: 7th Dec 2006, 21:40

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •