Changing Spark Plugs or Ignition Coils on R172 3.5L V6 (M276 Engine) - Page 2 - Mercedes Benz SLK Forum

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#21 Old 04-08-2019
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Quote:
Originally Posted by Vmax97 View Post
Great PDF for changing plugs on the harder M276 engine.

Looking for additional information for changing the air filter, dust filter and any other "while you are doing the other thing, you should consider doing this at the same time!" type help.

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#22 Old 04-08-2019
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Quote:
Originally Posted by SLK230C350 View Post
Well I replaced the C350 plugs back in June and it wasn't too awful. I bought the indexed plugs. There is certainly no reason to remove the intake manifold as one set of instructions suggested. No need to disconnect the air cleaner housing from the duct either, it will swing out of the way with plenty of room to get to the coils. Removing/replacing the engine controller is not difficult. The driver's side is harder to do then the other due to tight space by the plugs. Definitely use the dielectric grease to make the next replacement go smoothly. I agree it's hard to tell when the plug wire seats on the plug as it's a bit like pushing a wet noodle with the coil housing. Everything got put back together and worked fine on the first try.
Is the use of indexed plugs mandatory?
If you don't, will it hurt something?
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#23 Old 04-09-2019
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Originally Posted by peroel View Post
Is the use of indexed plugs mandatory?
If you don't, will it hurt something?
I certainly did NOT index my new plugs and my car's engine has run just great since I installed the OEM plugs.
In fact, I had never even heard of indexing spark plugs until it was mentioned in this thread.

Apparently there is disagreement among experts that indexing helps performance or does not help it.

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#24 Old 04-09-2019
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Quote:
Originally Posted by peroel View Post
Is the use of indexed plugs mandatory?
If you don't, will it hurt something?
Interesting read. Makes sense to me

Getting the Most Out Of Your Ignition: Spark Plug Indexing 101


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#25 Old 04-09-2019
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Good write up on why you need to buy the indexed plugs.

https://f01.justanswer.com/eurotec/c...3702_79551.pdf
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#26 Old 04-12-2019
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Quote:
Originally Posted by WhiteRabbit View Post
I certainly did NOT index my new plugs and my car's engine has run just great since I installed the OEM plugs.
The OEM plugs are pre-indexed, you don't have to index them.
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#27 Old 04-13-2019
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I wonder how a plug is "pre-indexed". It would seem impossible to ensure the manufacture of two pieces (head and plug) could be calibrated to ensure they come together exactly right. Unless there is some radical change to the mechanical nature of the two.

If the compression ring had a bigger sweet spot, I could maybe see "turn to 23 nm and then until the mark is aligned", but I can't see how you can just "torque to 23nm and alignment is guaranteed".

And aren't there some gas laws that ensure the fuel/air charge is evenly distributed in the combustion chamber?
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#28 Old 04-19-2019
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Quote:
Originally Posted by efair View Post
I wonder how a plug is "pre-indexed". It would seem impossible to ensure the manufacture of two pieces (head and plug) could be calibrated to ensure they come together exactly right. Unless there is some radical change to the mechanical nature of the two.
I don't see it being that hard. You just have to precisely control where the threads start in the head and the position of the plug electrode relative to the plug thread and plug base. All completely controllable with machining equipment.
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#29 Old 04-21-2019
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According to one of the articles posted in this thread, there is about 90 degrees variance when the gap comes to rest that it will still be ok..
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#30 Old 07-12-2019
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Quote:
Originally Posted by jet_fl View Post
Good write up on why you need to buy the indexed plugs.

https://f01.justanswer.com/eurotec/c...3702_79551.pdf
Thanks, that really demonstrates the need for indexing of spark plugs for Mercedes direct injection engines! And I recant my previous skepticism about indexing.

Based on that document I'm concerned about having used Bosch OEM plugs instead of Mercedes branded plugs when I changed my SLK's plugs.
Obviously the Bosch ZR 6 SII 3320 plugs are the correct length and heat range unlike the NGK plugs mentioned in the document but I'm concerned if the Bosch OEM ones are "indexed" correctly.

To find out I just bought a set of Mercedes spark plugs from a Mercedes dealer-online.
NOTE: the spark plug part number has changed to A004 159 81 03, it used to be A004 159 64 03.
Each plug is also stamped with Z 6 SII3320 R, it used to be Z 6 SII 3320 (I assume the R stands for Resistor plugs).

Once the weather cools off here and in my garage, in 6 weeks or so, I'm going to change the plugs again.
I'll try to determine if the Bosch OEM plugs I installed originally were "Indexed" correctly when I remove them.
And then check for correct Indexing of the new plugs when I install them.

I'll then update my original document with my findings and the need for indexing.

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#31 Old 3 Weeks Ago
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Quote:
Originally Posted by WhiteRabbit View Post
Based on that document I'm concerned about having used Bosch OEM plugs instead of Mercedes branded plugs when I changed my SLK's plugs.
Obviously the Bosch ZR 6 SII 3320 plugs are the correct length and heat range unlike the NGK plugs mentioned in the document but I'm concerned if the Bosch OEM ones are "indexed" correctly.
I found a reference to the Bosch OEM spark plugs stating that they are manufactured exactly like the M-B version of the spark plugs are.

From: https://www.fcpeuro.com/products/mer...sch-0041598103

"This Bosch Plug is specifically designed for the Mercedes M276, M278, M157, M152 direct injected engines and it's variants.
The threads in the spark plug and in the cylinder head are calibrated in such a way during the production that the correct installation position is guaranteed.
The spark plug has a copper sealing ring that maintains a defined and small clearance even after repeatedly correct assembly measures.
Proper installation torque must be used 23Nm"

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#32 Old 3 Weeks Ago
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You wasted your time and money! Those plugs are good for 60K miles! BTW, a long 5/8" socket will remove the plugs:

https://www.sears.com/craftsman-5-8-...SABEgIZSfD_BwE
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#33 Old 3 Weeks Ago
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plug socket

I have a 2012 slk 350 and a 5/8 spark plug socket that you show ( i have one just like it in my set) will not work. I just changed my last week and still have the old plugs. I am not sure a 5/8 socket will fit down the hole. A 14mm 12 point worked correctly. 14mm 6 point will not fit the plugs taken out or the ones installed.

Last edited by Mountainaire; 3 Weeks Ago at 05:56 PM. Reason: add info
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Thanks a bunch for all the links to some very neat tools!

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