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Spark Plug removal and install [M276 Engine]

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Spark Plug removal and install [M276 Engine]

 
Old 12-01-2017, 09:38 PM
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2013 GLK350
Spark Plug removal and install [M276 Engine]

So here is a (work-in-progress) guide for removing the spark plug to your engine. This guide is also applicable to other Mercedes-Benz models such as the ML350, E350, C350, and GLE350.

Take precaution and use the proper tools to avoid damage to the engine. A broken spark plug will cause internal damage to the engine.

TOOLS REQUIRED:
• 1/4" drive torque wrench capable of 9nm / 80 in-lbs
• 3/8" drive torque wrench capable of 23nm / 204 in-lbs / 17 ft-lbs
• 14mm / 9/16" spark plug socket, 12 point
• Clic-R pliers
• Spark plug boot pliers or puller
• External Torx 8 socket
• External Torx 10 socket
• Torx 20 driver
• Torx 25 driver
• Torx 30 driver
• Long socket extensions
• Plastic trim tools

PARTS REQUIRED:
• Di-electric spark plug grease (Mercedes-Benz 002-989-80-51 / Versachem 15309 )
• Spark plugs (Bosch ZR6SII3320 / Mercedes-Benz 004-159-81-03)

OPTIONAL ITEMS:
• Upper air intake seals (276-141-01-80)
• Ignition coil packs (276-906-05-01)
• Vacuum with narrow hose
• Spark plug gap gauge
• Shop towels
• Magnetic retrieval tool
• Video borescope
• Cotton swab
• Fender liner
• Electrical contact cleaning spray
• Engine cleaning spray

STEP 1:
Ensure engine is off and key removed from ignition. Pull the red lever in the driver's footwell to release the engine cover. Set the engine cover to the vertical position and remove the first cover. I recommend doing this service while the engine has been deactivate for some time so yo avoid the thermal heat.


STEP 2: Disconnect battery using 10mm socket.

STEP 3:
Remove the engine cover (276-010-02-67).


STEP 4:
We need to remove the air filter box. If you have fender liners place them now to prevent scratching your paint. Remove the sensor, clic-clamp, two E10 bolts, and air nozzle clip. Then remove the rubber boot and lift the whole assembly out. Set aside the sensor.

STEP 4a:
Disconnect the ECU wires by pulling on the 2 opposing tabs. Use a plastic wedge tool to assist if the tab is difficult to release. The outward position is about 25mm or 1 inch away.




STEP 4b:
Remove the clips that hold down surrounding wires and lift the entire ECU unit straight up. You can see it is held in place by these four protrusions.

STEP 4c:
Remove this Torx 30 M6x1 - 14mm pan head screw and the bracket (276-150-37-73). Remove the cable harness clip if you have not done so previously.


STEP 5:
Remove the V6 plastic cover plate (276-141-00-21) by unscrewing the top two Torx 20 screws. Using your E10 socket with an extension, undo the two steel bolts inside the hole. They are recessed approximately 75mm / 3" deep, a magnet is recommended to retrieve them. Note that the mating insert appears to be a brass alloy, so be careful not to cross thread the insert.



STEP 6:
Remove the two E10 bolts in the back of the housing.


STEP 7:
Remove these two sensors near the back. They are different lengths and cannot be mixed up.



STEP ?:

STEP ?:


STEP ?:
So now you have the intake manifold off, plug each cylinder intake with clean plugs or towels.


STEP ?:
Undo the ignition coil connector by pulling the grey tab all the way out. Simultaneously press down on the grey tab and pull the connector out of place.

STEP ?:
Remove the two E8 bolts per ignition coil pack. Then using the spark plug boot pliers or puller, yank on the boot and you should hear a popping sound. Set aside.

STEP ?:
Extract the old spark plug using the provided 14mm socket and a ratchet. Take precaution when inserting the socket to prevent the ceramic breaking. When you are ready to remove the old spark plug out of the hole, ensure it is being securely held by the rubber ring, magnet, or spring clip depending on the type of socket you are using.

STEP ?:
Start the threads of the spark plug by your fingers only. Set torque wrench to 23nm or 17 ft-lbs and gradually reach target torque.


STEP ?:
Pack the greased ignition coil back into place. Start the E8 bolts then torque them to 9 nm / 80 in-lbs. It does not matter which bolt you torque first.

Last edited by JohnnyC; 02-06-2018 at 04:50 AM.
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Old 04-29-2018, 04:37 PM
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Glk 300 4matic Sport
Shortcuts to replace the plugs

Thank you for your post. Together with the quotation from dealer usd 500 It encourage me to do the replacement by myself on my Glk 300 Sport with same engine M276. However, as it was my first time in a Benz, I was afraid to remove the complete top cover and admision system, so
when I was about to buy some tools to do the job easily, I find a pdf file that I want to share with you. The process requires less tools, less operations and works fine. What do you think?

Regards,

https://mbworld.org/forums/attachmen...eplacement.pdf
Ale Raineri is offline  
Old 04-08-2019, 02:04 PM
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Mercedes C300 W2014
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Originally Posted by Ale Raineri View Post
Thank you for your post. Together with the quotation from dealer usd 500 It encourage me to do the replacement by myself on my Glk 300 Sport with same engine M276. However, as it was my first time in a Benz, I was afraid to remove the complete top cover and admision system, so
when I was about to buy some tools to do the job easily, I find a pdf file that I want to share with you. The process requires less tools, less operations and works fine. What do you think?

Regards,

https://mbworld.org/forums/attachmen...eplacement.pdf
Thank you for the pdf. Excellent work! Much appreciated!
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Old 04-23-2019, 04:31 PM
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GLK 350
Outstanding write up. I now feel like I need a couple beers.. Not sure I want to tackle this job... How many hours for dealership to do this?
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Old 04-28-2019, 07:29 PM
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'07 GL320CDI, '10 CL550
This is an awful lot of work to install the wrong spark plugs.

i have no M276 engine experience, but know for certain that correct spark plugs for the M272/3 series engines are NOT available from Bosch in the USA aftermarket. Know that Bosch USA is a nearly completely separate company from Bosch Germany and seldom sells the same products. For spark plugs they seem to think Americans won’t install anything except resistor spark plugs (or maybe they are cheaper to produce). Mercedes did NOT install resistor plugs on the assembly line and the plugs sold by your Mercedes dealer are not resistor plugs either. It’s pretty suspicious to see the R included in the Bosch number listed in the write up. I’d compare that with the number on a factory or dealer plug. A different number is a different plug, and the R is the number difference when comparing M272/3 plugs and it wouldn’t surprise me if it’s the case regarding M276. It won’t break the bank to install the correct plugs
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Old 04-28-2019, 08:06 PM
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GLK 350
We were quoted 845 to replace the GLK 350s spark plugs.. thats just amazing..
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