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Clk om642 engine reliability

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by ash1212002, Jan 3, 2018.

  1. ash1212002

    ash1212002 Senior Member

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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate
    Found a 320 cdi clk 71k on the clock which has the om642 engine 2007 reg

    How reliable is this engine? Anything to look out for?

    Were any changes/modifications made to the engine for the clk in later years?
     
  2. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    Location:
    Hedge End, Southampton
    Your Mercedes:
    124 300 CE 24 Coupe, 209 240 CLK
    There are hundreds of thousands of these engines out there with out ever having a fault but I will list a few faults of the top of my head,

    Turbos
    Inlet port shut off motors
    Front main bearings
    Front and rear main seals
    Glow plugs snap off in the heads
    Oil cooler seals flood out
    Timing chains
    Inlet manifold flaps links wear out
    Front EGR pipe firs up with carbon
    Black Death
    Exhaust manifold lining come off and hit turbo vains
    Water pumps leak

    Probably a couple of other bits but that’s few.......
     
  3. OP
    ash1212002

    ash1212002 Senior Member

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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate

    Blimey! Is it best to avoid the 320 clk diesel engine?

    Anything I could look out for if i do decide to view and consider purchasing?

    How does the 320 compare to the 220 cdi in terms of issues?
     
  4. LostKiwi

    LostKiwi Senior Member

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    Talk about putting him off! :)
     
  5. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    W212 E63 ///AMG V8 Biturbo Volvo XC90 2018
    Is that list ( or at least the majority of it) not common to a number of most Mercedes diesels?
     
  6. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    I would have the 4 pot and get it remapped, less to go wrong,

    Sorry about the list, the chap asked !!
     
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  7. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    124 300 CE 24 Coupe, 209 240 CLK
    The ex run a 642 up to 320000 miles without any of the above problems!!
     
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  8. OP
    ash1212002

    ash1212002 Senior Member

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    Joined:
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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate
    Had a clk 200 previously but now looking for a diesel although will be used for short journeys and odd long journeys.

    220 remapped what can it achieve?

    You recommend the 220 over the 320? If so any advice on what to look out for?
     
  9. Avnt

    Avnt Senior Member

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    Mexborough
    Your Mercedes:
    Mercedes c350 cdi estate amg
    Thats some miles was it a taxi or something


    Sent from my iPhone using Tapatalk
     
  10. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Forums are a collection of horror stories , as Cole says , some can run trouble free . I have an E320cdi om642 on a 2009 , same engine as the clk . It is a wonderful engine , drive the 220cdi and you will know all you need to .
     
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  11. malcolm210

    malcolm210 Senior Member

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    The 642 V6 diesel is quite refined and I would buy another. Cole’s list is generic and you may have one or two of the issues listed occur in your ownership but that’s the same with any car. As already said try both the 4 pot and 6 pot and there is only one winner
     
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  12. M80

    M80 Senior Member

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    Your Mercedes:
    Viano 3.0 ExLWB (09)
    Diesels aren't the best for short journeys, especially if it has the DPF.

    As for remapping I would first consider the style of driving you are likely to use it for. If you enjoy the right foot response then max power / torque is good, if you plod like me then the extra power isn't really needed. Although the motor can feel easier at lower revs, around town for example.

    The V6 320 CDI is smoother and quieter than the 220 CDI.
    I would expect it would be easier to find a 220 without the DPF and that would make the consumption difference between them significantly different.
    The early C class 320 had the option of a DPF, as I understand the Viano 320 all have a DPF, with the CLK I can't comment.

    If you get the VIN no of the CLK and post it here someone will tell you if it has the DPF.
     
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  13. OP
    ash1212002

    ash1212002 Senior Member

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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate
    Based on what I have researched thus far my understanding is that neither the 220 or 320 had dpfs

    om642 is what i believe was fitted to the 320 and om646 was in the 220, i dont believe the clk ever had the om646 evo fitted?

    Predominantly the car would be used normally but would also enjoy having the torque and power on tap when needed

    Based on my circumstances I'm thinking the 220 would suit me most, smaller engine more economical and suited more for short journeys compared to the 320 as i will be unable to exercise the engine very often, unless someone could tell me otherwise.

    I plan to keep the car long term and intend to maintain and service it myself

    In terms of reliability is the 220 engine more reliable than the 320?
     
    Last edited: Jan 5, 2018
  14. M80

    M80 Senior Member

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    Your Mercedes:
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    IMO the simple answer is yes.
    Of that age the 220 will still have the easy to snap glow plugs, otherwise a robust engine known to do stella mileage.

    The 320 is superior in the drive though. Still reliable with many high mileage examples around.
    TBH if your sure the 320 won't have a DPF I would choose that over the 220. If it turns out to have a DPF leave it.
     
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  15. OP
    ash1212002

    ash1212002 Senior Member

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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate
    Ok great! Thanks for your input

    Finding a fully loaded 320 or a 220 low mileage with xenons, heated seats, memory seats, sat nav are very rare, so need to be patient to find the right one!

    Sunroof on these models are also very rare!

    Ideally would also want an 58 or 09 year as i believe 09 was the last build for the clk
     
    Last edited: Jan 5, 2018
  16. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Remember they all need an ATF oil and filter change at 37500 miles , and ideally every 40k miles after that .
    My 2009 E320cdi has no DPF , although plenty of earlier ones than that do have them .
     
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  17. OP
    ash1212002

    ash1212002 Senior Member

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    Your Mercedes:
    clk 200 coupe kompressor auto 57 plate
    Do they have the 7g gearbox? I thought that it was for life but have heard it is good practice to do at 50 or 60k
     
  18. malcolm210

    malcolm210 Senior Member

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    Yes still some low miles 09 plate 320 sport models around and by that time the 211 was very well sorted, as already said just check the VIN re DPF. You are almost in 212 territory price wise but they do all have a DPF but to be honest I do similar mileage to you without problem the main thing is that you know about DPF and low mileage issues and accommodate it, when mine starts a regen I run the car till it finishes the cycle if I can
     
  19. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Yep , 7g . I think the sealed for life argument ran out in 2004 ish , it was replaced by sealed for death :D . I think for a few years before my cars production date MB specified a one off ATF service at 37500 miles . It has become adopted by others who read too much and want to keep their car long term to keep up this schedule .
     
  20. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    As an example of cars with horror stories your car ( and my clk )has an M271 engine , if you read the Internet on that one you would never have bourght it
     

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