How to change sparkplugs

[borz]

Hello every one
My car is due for B service and I am going to have the oil and filter don by the garage and going to try to change the spark plugs myself for the first time, I will be grateful if any one has any pictures and advice on how to and what tools I will need to do this task I already have the spark plugs supplied by MB .thank you
my car is C180 estate W203 2007

 

[Abb]

If you don't mind me asking, why?? The cost surely would be negligible to get the garage to do them, if you are supplying them.

 

[borz]

you are right , but she does not need the spark plugs this time because i have had them changed 2 years ago ,I just need to know how to do them for the next time i would like to do the full service myself . thank you for reply

 

[Abb]

No probs. Have changed plugs in the past on older cars, normally a straight forward process, unless you are unlucky to have a seized/stuck one. IIRC it's a 17 or 19mm long reach socket for spark plugs or a specific spark plug socket/tool you will need. Remove HT lead (or whatever they are called nowadays) insert socket and turn anti clockwise! The spark plug is normally 'gripped' within the housing of the socket due to rubber washer in there.
It's important to check the condition of the plug you remove, as it will tell you what's going on in the engine, (heavy soot deposits, oily etc)

PS I am no mechanic and this is only what I have done in the past. Am sure so done with far more knowledge and expertise will be along shortly to help out.

 

[borz]

Thank you again .

 

[markjay]

Dead easy. Remover plastic engine cover (pull hard upwards) then disconnect and remove each of the four coil pack - two bolts per coil pack.

Make sure to (slowly) lift the coil pack straight up and not bend it right or left too hard.

From that point on, remove and replace spark plugs as you normally would, tightening to recommended torque etc.

On refitting, I recommend to torque-tighten the coil pack bolts though you will need a low-range torque wrench (e.g. 4-25 Nm from memory).

Incidentally, the spark plugs are due every four years so you still have two years to go.

 

[borz]

thank you that is grate help, i will practice taking the cover off with out taking the spark plugs out till the time comes to change the spark plugs together with oil and filter. thank you for the reply

 

[dangermouse1976]

thanks all for the info...I too am looking to do this...so the info is really helpful

 

[Braincrank]

I don't know how the modern engine look like (re plugs ) but on my 124 it's all open and easy accessible. Once the plug is out and I want to put the new one in I use a little piece of tube/hose (the one you get for air stones in aquariums ) that fits nicely on the end of the plug .
That way you will quite easily manage to get the plug back into its socket without the danger of cross threading. You can slowly turn the plug until it's in and then just pull the tube off and do the rest with the wrench .
Just a little tip on how I do it (-:

 

[Aletank]

When you take the engine cover off, before replacing it, I would grease the 4 studs so it comes off easier next time. I had one crack/break on me , ended up costing me about £30 for a replacement from a breakers.

 

[190]

I don't know how the modern engine look like (re plugs ) but on my 124 it's all open and easy accessible. (-:

Older cars are a joy to work on when everything is sat there looking at you instead of hidden in the depths behind plastic covers.