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m112 c320 spark plugs change

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by mattuk, Jan 4, 2013.

  1. mattuk

    mattuk Senior Member

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    Hi all

    Weather looks fine in January so I am planning to change spark plugs in mu c320 2001 96k miles

    I've seen lots of diy so I am ok with the job but I need Your help to choose correct plugs.

    MB wants £120, I think it's too much. Anyway I checked ECP and they got bosch super plus for £5.40 each with discount it works out just under £50 so sound. However I am not sure if these plugs are suitable for m112 v6?
    Has anybody used these plugs from eurocarparts? Going further in halfords bosch super plus x4 cost £32! There is big gap between two shops and I am wonder if ecp is giving right stuff.


    Please for Your advise
    Thanks
     
  2. television

    television Always remembered RIP

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    I bought mine off Ebay and no problems at all with the NGK £99 for all 16
     
  3. Miffy

    Miffy Senior Member

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    rather you than me, have you looked at how hard to reach those rear plugs are? do you have a tool ready to pull the caps off?
     
  4. television

    television Always remembered RIP

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    I did this with only one hand and the details in the DIY section
     
  5. Miffy

    Miffy Senior Member

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  6. television

    television Always remembered RIP

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    Only having one hand at the time of doing mine I dropped loads down below, it was handy for once having a steep driveway for they all rolled to the rear of the tray and I could pull most out from underneath. Colin removed the last two plugs when in for a service :D
     
    Last edited: Jan 4, 2013
  7. dog68

    dog68 Senior Member

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    Don't forget to get some deep heat gel.. unless its just me getting old, LOL. :)
     
  8. OP
    mattuk

    mattuk Senior Member

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    Thanks for quick reply guys!

    No I haven't wrench yet but I am going to make it myself unless I find one cheap somewhere.

    So 17mm wrench? I've seen someone diy using 18mm flat wrench but I'll do both sizes on my one.
    I got set of ratchets in few sizes with extensions + short and long spark plug sockets 14mm thread(is 14mm correct plugs isn't?) so I should get in on the back plugs. However my mate will help me with his tools(lots and lots of tools)

    So you prefer NGK instead of bosch? I got nothing to ecp but £50 vs £100 in halfords for same plugs sounds a bit unreal.
     
  9. OP
    mattuk

    mattuk Senior Member

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  10. OP
    mattuk

    mattuk Senior Member

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    No no I got nothing to ecp, I used it mostly if I need to get something but I just was wonder if I buy bosch plugs I will get real bosch plugs(no china copy)if u compare prices in this scenario only


    If I won't forget I'll make pictures and show you what tools I got and if something missing you can point me?
     
  11. OP
    mattuk

    mattuk Senior Member

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    Malcolm I saw your magic wires tool made by you which does sexy job :-D

    I want one like yours( instead of bending and cutting flat steel)
    Can u please say how did u do it?
    On your diy you mentioned 5/16 and cut open. I got exacly same type 5/16(imperial) but in hand looks too small . however getting compare flat open wrench size 17mm to this spanner looks exacly as you said 16.5mm. Is it definitely 5/16? I got few spares size 3/4 and 5/8 which look very similar to open wrench 17mm. Sorry for being pain now but using your help I can get it done correctly.

    Also how much did you cut out to make opening? How many mm did u go of center?
    Thanks
     
    Last edited: Jan 4, 2013
  12. television

    television Always remembered RIP

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    Yes that was the size 5/16 whit this will one size up on the BSF heads as the size changed just after the war.I just ground out enough so that the spanner went over the plug and thats about 16mm
     

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  13. OP
    mattuk

    mattuk Senior Member

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    I got it. I'll make one tomorrow and post back
    If you don't mind what is the size in between sides?16mm is the size of the spanner isn't? from one edge to the other edge in straight line(in opening)I ?I could go to the car but I don't want to get all covers off while dark outside just to see if it fits.

    Thanks


    Ps so you prefer ngk plugs right?
     
    Last edited: Jan 4, 2013
  14. television

    television Always remembered RIP

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    I had the same problem,, what plugs ???? I read till I could read no more and settled on the NGK.......confusing for me as when British made it was GNK or NKG :D:D
     
  15. OP
    mattuk

    mattuk Senior Member

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    hi

    here are some pictures of tools i will use

    [​IMG]

    [​IMG]
    do i need more extensions or something else?

    here is picture of tool i made using Malcolm's technology:D
    red arrows show size 17mm. enough?
    [​IMG]

    i still got "confused.com" what plugs... i read somewhere to avoid platinum plugs as these may cause misfires. did u hear that? what is you experience and opinion on that?
    both bosch and ngk match MB plug codes and these are platinums so i don't know how platinums can cause misfires if recommended by MB. strange?
     
  16. television

    television Always remembered RIP

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    That looks like my spanner :D:D spot on and good on you.

    Yes you only need short extensions

    I did not use the platinum plugs,,,I dont think so anyway, I had also read of problems
     
  17. grober

    grober Senior Member

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    Because they are such a pain to remove/fit I would go for the longlife NGK Iridium plugs type BKR5EIX-11 for your car. check here http://www.ngkpartfinder.co.uk/ A set of 12 will set you back about £80 but you should not have to change them again for about 60K miles. Because they use a very narrow Iridium tipped centre electrode they require less HT to fire and resist fouling much better. Reputed also to smooth out idle and any slight part throttle misfires also.
     
  18. OP
    mattuk

    mattuk Senior Member

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    I got extension but about 3 and 4 inches long. I think too long

    On your diy I saw one about 20-30mm. Are you talking about this one?I think it's got hole in the middle
     
  19. television

    television Always remembered RIP

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    As long as there is enough clearance between the engine and the inner wing you should be OK with what you have.

    If I recall correctly I had to push the plug socket over the plug, and then fit the ratchet handle as it was too long to go in in one lump, if that is clear enough.
     
  20. OP
    mattuk

    mattuk Senior Member

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    Yes I am with you TV thanks


    I'll go for ngk as lots of members said.
    Ps mb says every 4 years or 60k miles, my car done 30k miles but plugs have not been changed since 8years so it's defo time for new set
     

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