CLA250 Spark Plug Replacement (DIY Definitive Guide)
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CLA250 Spark Plug Replacement (DIY Definitive Guide)

This is a discussion on CLA250 Spark Plug Replacement (DIY Definitive Guide) within the CLA Modifications / DIY forums, part of the Mercedes-Benz CLA Forum category; This guide will walk you through a 60k spark plug service for the CLA250 M270 engine. Service manual recommends changing the plugs every 60k miles. ...

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Thread: CLA250 Spark Plug Replacement (DIY Definitive Guide)

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    CLA250 Spark Plug Replacement (DIY Definitive Guide)

    This guide will walk you through a 60k spark plug service for the CLA250 M270 engine. Service manual recommends changing the plugs every 60k miles. I did mine @ 63569. The internet has very scarce instructions/video at this point. Most CLA owners probably has not reached 60K yet. Special thanks to youtube channel @UnboxWorld for making a video for the 1.6T engine.

    Make sure the engine is cold and the car is in "sleep mode" before doing any of these steps. Keep the keyfob away from the car and open the driver side door. The car is in sleep mode once the interior lights turn off. At this point, do not wake the car by closing/opening any of the doors or the trunk.

    Tools needed:

    Torx set
    Socket / ratchet set (with extensions)
    Flat head screwdriver
    3pcs 18.5 oetiker clamps
    Oetiker wrench
    14mm 12 point spark plug socket THIN WALL
    Torque wrench (very important!)

    Air compressor
    Blow gun
    Vacuum

    4 spark plugs (NGK SILZKFR8E7S)
    Spark plug lubricating grease A002-989-80-51

    STEP 1
    Remove the 3 torx screws from the airbox neck (green circle) and loosen the two hose clamps (red circle).

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    STEP 2
    Detach electronic connectors (green arrows), then detach vacuum lines (red arrows). There are a lot of videos on how to remove oetiker clamps. All you need is a flathead really.
    1. Vent line
    2. Wide open throttle heater element vent line
    3. and 4. purge lines

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    STEP 3
    Remove the intake pipe by sliding it to the left. The intake pipe will need to go under the non-removable cables (see first picture)

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    STEP 4
    Detach electronic connectors from the coils.

    STEP 5
    Remove the coil screws. Note that the spark plug boots are at an angle. You may use the ring spanner side of a wrench to pull the coil, using the pull tabs.

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    STEP 6 (VERY IMPORTANT)
    Prior to removing the plugs, use compressed air to blow gun loose debris. You don't want any debris falling off in your cylinders when you remove the sparks plus. An air can is a no no. Use compressed air with at least 90psi pressure.

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    STEP 7
    Using your spark plug thin-wall socket, slowly turn counter-clockwise. Mercedes does not recommend using anti-seize on the threads so you will hear metal to metal as you turn. There will most likely rust too (as mine did).
    Remove and replace plugs one at a time.

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    STEP 8
    Since rust from the thread might have fallen off inside the cylinders, it is a good idea to vacuum the canal before installing new plugs. I just improvised and cut a piece of tube and shrink-wrapped it on my vacuum extension.

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    Continued...
    Last edited by Picard; 10-22-2018 at 10:28 PM.
    traxem and martonikaj like this.

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    STEP 9 (VERY IMPORTANT)
    Put in new plugs and hand-tight clockwise first, then torque the plugs to 17 ft/lb using your torque wrench.

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    STEP 10
    Lubricate the tips of the boots and reinstall everything back.

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    CLA250 Spark Plug Replacement (DIY Definitive Guide)

    Very cool! Glad you found ways to release the intake pipe ... thats the biggie.
    Presume you managed to source the new clamps? Dealer special?
    Was that one plug actually different in terms of deposits?
    Did you use a drop of thread lube before reinstalling despite the “dry” recommendation? (the dissimilar metals thing....)
    Wonder if that boot "grease" is dielectric gooo ...
    Hope your car now drives better with mpg maintained ... the sparkers were updated and no details on why but they “look” the same and might have to section them to see what the deal is between the two variants
    Last edited by jmc; 10-22-2018 at 08:20 AM.
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    Quote Originally Posted by jmc View Post
    Very cool! Glad you found ways to release the intake pipe ... thats the biggie.
    Presume you managed to source the new clamps? Dealer special?
    Was that one plug actually different in terms of deposits?
    Did you use a drop of thread lube before reinstalling despite the “dry” recommendation? (the dissimilar metals thing....)
    Wonder if that boot "grease" is dielectric gooo ...
    Hope your car now drives better with mpg maintained ... the sparkers were updated and no details on why but they “look” the same and might have to section them to see what the deal is between the two variants
    Amazon has the ear clamps. There are other brands too but I went with the oetiker brand. Plugs from cylinders 2,3,4 had the most carbon deposit. Very black. Plug from cylinder 1 was just brown, but all 4 had rust on the threads. I didn't use any anti seize. The car definitely drives like new! I'm surprised how these plugs change that engine's subtle character as they age. New plugs, in effect, is a semi tune-up.

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    Good! Finally someone to back me up — plugs can make a difference ... even iridium tips wear at a less than ideal rate ... have to do mine at 25k.
    That one plug is what we “want” to see but I wonder if the other three is what we “should” see cuz of the direct injection low squirt multispark operation ... and if those three are already like that can you imagine the combustion chamber? So that one (cleaner plug) chamber has a slightly different compression ratio and different combustion characteristics ... perhaps Omar or someone with aux injection can show what their plugs look like?

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    Do you have to gap the plugs before installing them?
    2014 Mercedes CLA250 4Matic

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    Should be pregapped ... however trust but verify is my moto ...and can get variance over a 4 sample while we are at it

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    Quote Originally Posted by traxem View Post
    Do you have to gap the plugs before installing them?
    I only gapped it with eyes lol. I installed it as is. The plugs come gapped from the factory. But I agree with @jmc . A good idea to verify since your car will have it for the next 50k miles.

    Sent from my SM-N960U using Tapatalk

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    Quote Originally Posted by Picard View Post
    I only gapped it with eyes lol. I installed it as is. The plugs come gapped from the factory. But I agree with @jmc . A good idea to verify since your car will have it for the next 50k miles.

    Sent from my SM-N960U using Tapatalk
    I haven’t changed plugs in almost 20 years. Never kept a car long enough to do it. I did remember having to gap them. Are these plugs specifically pre-gapped for the CLA or is it just common now not to gap them?
    2014 Mercedes CLA250 4Matic

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