DIY: M112 Spark Plug R&R
MBWorld Fanatic!
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From: Huntington Beach, Ca.
'17 Jaguar XF
For some reason the plugs I put in had connectors ever so slightly larger than the ones I took out. Both were OEM. I ended up taking one of the new plugs out and using it to force the connectors open on all the plug wires while I had them out and in hand. Boot lubricant also helps.
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From: Austin, Texas
2003 Mercedes C240, 2009 Audi Q5
Good luck!
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
Place the
wire on the plug,turn your 17mm boot tool the opposite direction you used to lever the boot off and using your hand as the leverage point gently pop the boot back on.Instead of under the metal collar you are pushing from the outer side of the collar. Easy
Last edited by ohlord; Feb 28, 2011 at 02:54 AM.
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Joined: Sep 2007
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From: Indianapolis, IN
'01 S55 AMG designo Silver; '98 E320 4Matic Sedan;'98 E320 4Matic Wagon
Found this Socket Tool
Found this Socket Tool on eBay Motors & also avl on Amazon for ~$7.00, and am waiting for it to arrive: K Tool 22521 5/8" x 3/8" drive
Member
Joined: Sep 2010
Posts: 238
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From: Springfield, MO
2004 C320 Sport
Bumping this thread instead of creating a new one...
Went to the dealer and bought some spark plugs for my '04 C320 Sport with my $100 coupon and they gave me plugs based off of my VIN. The part number for the plugs is:
A 004 159 50 03 64
Now my question, these are obviously a different part number and the tips are gold instead of the silver/platinum. A google search yields little to nothing on this part number, rmeuropean does not have it listed for my model, and parts.com, and trademotion of Ft. Lauderdale are dead ends. Are these plugs safe to use or should I consider going back and trying to exchange them? They have a Mercedes logo on the plugs themselves and nowhere on the plug or the boxes does it say NGK or Bosch, etc.
Any help is appreciated. Thanks.
Went to the dealer and bought some spark plugs for my '04 C320 Sport with my $100 coupon and they gave me plugs based off of my VIN. The part number for the plugs is:
A 004 159 50 03 64
Now my question, these are obviously a different part number and the tips are gold instead of the silver/platinum. A google search yields little to nothing on this part number, rmeuropean does not have it listed for my model, and parts.com, and trademotion of Ft. Lauderdale are dead ends. Are these plugs safe to use or should I consider going back and trying to exchange them? They have a Mercedes logo on the plugs themselves and nowhere on the plug or the boxes does it say NGK or Bosch, etc.
Any help is appreciated. Thanks.
Thread Starter
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Joined: Jul 2006
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From: Orange County, CA
GMC - Miata - Trek - P-Car
Bumping this thread instead of creating a new one...
Went to the dealer and bought some spark plugs for my '04 C320 Sport with my $100 coupon and they gave me plugs based off of my VIN. The part number for the plugs is:
A 004 159 50 03 64
Now my question, these are obviously a different part number and the tips are gold instead of the silver/platinum. A google search yields little to nothing on this part number, rmeuropean does not have it listed for my model, and parts.com, and trademotion of Ft. Lauderdale are dead ends. Are these plugs safe to use or should I consider going back and trying to exchange them? They have a Mercedes logo on the plugs themselves and nowhere on the plug or the boxes does it say NGK or Bosch, etc.
Any help is appreciated. Thanks.
Went to the dealer and bought some spark plugs for my '04 C320 Sport with my $100 coupon and they gave me plugs based off of my VIN. The part number for the plugs is:
A 004 159 50 03 64
Now my question, these are obviously a different part number and the tips are gold instead of the silver/platinum. A google search yields little to nothing on this part number, rmeuropean does not have it listed for my model, and parts.com, and trademotion of Ft. Lauderdale are dead ends. Are these plugs safe to use or should I consider going back and trying to exchange them? They have a Mercedes logo on the plugs themselves and nowhere on the plug or the boxes does it say NGK or Bosch, etc.
Any help is appreciated. Thanks.
Nevertheless, MB’s rebranded and repackaged plugs typically have the manufacturer’s PN embossed on their shell.
Post that information and I’ll verify you’ve received proper plugs.
The M112 calls for a 14mm thread, 19mm (3/4") reach, 5/8" hex, gasket seat resistor plug.
Heat range differs depending upon application (e.g., supercharged).
M113 Kompressor/M271 shown
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Member
Joined: Sep 2010
Posts: 238
Likes: 4
From: Springfield, MO
2004 C320 Sport
One would like to believe a competent MBUSA counterman could furnish the correct replacement parts.
Nevertheless, MB’s rebranded and repackaged plugs typically have the manufacturer’s PN embossed on their shell.
Post that information and I’ll verify you’ve received proper plugs.
The M112 calls for a 14mm thread, 19mm (3/4") reach, 5/8" hex, gasket seat resistor plug.
Heat range differs depending upon application (e.g., supercharged).
M113 Kompressor/M271 shown
Nevertheless, MB’s rebranded and repackaged plugs typically have the manufacturer’s PN embossed on their shell.
Post that information and I’ll verify you’ve received proper plugs.
The M112 calls for a 14mm thread, 19mm (3/4") reach, 5/8" hex, gasket seat resistor plug.
Heat range differs depending upon application (e.g., supercharged).
M113 Kompressor/M271 shown
On the silver rim just above the threads: OF 073
The Box reads:
A 004 159 50 03 64
Maid in USA 15415227 14.09.10
Thanks for any help Splinter, it's much appreciated.
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Joined: Jan 2005
Posts: 2,848
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From: Orange County
2005 C Wagon (No snickering please!)
Interesting. The number on the porcelain (KC10PYPB4) is a Champion (Federal Mogul) part number that they say fits:
CHRYSLER CROSSFIRE 2008-2004
MERCEDES-BENZ C32 AMG 2004-2003
SLK230 2004-2003
SLK32 AMG 2004-2003
Mercedes does respecify and supersede parts all the time, so it is possibly OK. You need to assume the parts Bob typed in the VIN correctly.
I also find it interesting that the box says "Maid (hmm, cleans the windows too?) in USA" because there is a large plant near Shanghai that makes similar plugs and some counterfeiters print other peoples logo's on them.
CHRYSLER CROSSFIRE 2008-2004
MERCEDES-BENZ C32 AMG 2004-2003
SLK230 2004-2003
SLK32 AMG 2004-2003
Mercedes does respecify and supersede parts all the time, so it is possibly OK. You need to assume the parts Bob typed in the VIN correctly.
I also find it interesting that the box says "Maid (hmm, cleans the windows too?) in USA" because there is a large plant near Shanghai that makes similar plugs and some counterfeiters print other peoples logo's on them.
Member
Joined: Sep 2010
Posts: 238
Likes: 4
From: Springfield, MO
2004 C320 Sport
Yeah, i found the same after googling that number. Wasn't aware MB used any Champion plugs, but it has the MB logo on it.
The "maid" was actually a typo on my part. The box reads correctly. Nice catch!
The "maid" was actually a typo on my part. The box reads correctly. Nice catch!
Senior Member
Joined: Jul 2011
Posts: 408
Likes: 40
From: Hawaii
2017 GLA 250, 2011 C63 P31 (p30 w/ lsd) (in repair), 2005 C230 Sport Eurocharged, 2003 C320~sold
Great write up -- here's a vid I found to compliment this 
(maybe a mod wants to add it to the 1st post)
(maybe a mod wants to add it to the 1st post)
Newbie
Joined: Dec 2013
Posts: 3
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2003 Mercedes Benz c240
Thank You All - You saved me $600+ on Spark Plug replacement
Stealer: $800
Autozone parts: $146... (i got extra spark plugs)
Time: 5 hours or so...
I had never even changed the oil in my car before reading this post. I read this and got my supplies, disconnected the negative connector from the battery (not both), replaced 6 spark plugs, let it sit for a week, replaced the other 6, reconnected the battery (got a spark when i reconnected) turned the key and everything was good to go. Just needed to set the time. No Issues. That led to me replacing the wipers, cabin filter, headlight which saves me over $750... so far. Fuses next. Thank you all for empowering me to be handy with car repairs and giving me the confidence to fix the rest of these little things myself and save hundreds of dollars along the way. And you've been great for my social life.
My chick is like "That's so sexy!". #Winning!
Autozone parts: $146... (i got extra spark plugs)
Time: 5 hours or so...
I had never even changed the oil in my car before reading this post. I read this and got my supplies, disconnected the negative connector from the battery (not both), replaced 6 spark plugs, let it sit for a week, replaced the other 6, reconnected the battery (got a spark when i reconnected) turned the key and everything was good to go. Just needed to set the time. No Issues. That led to me replacing the wipers, cabin filter, headlight which saves me over $750... so far. Fuses next. Thank you all for empowering me to be handy with car repairs and giving me the confidence to fix the rest of these little things myself and save hundreds of dollars along the way. And you've been great for my social life.
My chick is like "That's so sexy!". #Winning!
Newbie
Joined: Feb 2014
Posts: 14
Likes: 0
2005 c320
So which spark plugs did you wind up using? I hava a c320 that takes 12 plugs, and have read all sorts of opinions as to which plugs to use.
Stealer: $800
Autozone parts: $146... (i got extra spark plugs)
Time: 5 hours or so...
I had never even changed the oil in my car before reading this post. I read this and got my supplies, disconnected the negative connector from the battery (not both), replaced 6 spark plugs, let it sit for a week, replaced the other 6, reconnected the battery (got a spark when i reconnected) turned the key and everything was good to go. Just needed to set the time. No Issues. That led to me replacing the wipers, cabin filter, headlight which saves me over $750... so far. Fuses next. Thank you all for empowering me to be handy with car repairs and giving me the confidence to fix the rest of these little things myself and save hundreds of dollars along the way. And you've been great for my social life.My chick is like "That's so sexy!". #Winning!
Autozone parts: $146... (i got extra spark plugs)
Time: 5 hours or so...
I had never even changed the oil in my car before reading this post. I read this and got my supplies, disconnected the negative connector from the battery (not both), replaced 6 spark plugs, let it sit for a week, replaced the other 6, reconnected the battery (got a spark when i reconnected) turned the key and everything was good to go. Just needed to set the time. No Issues. That led to me replacing the wipers, cabin filter, headlight which saves me over $750... so far. Fuses next. Thank you all for empowering me to be handy with car repairs and giving me the confidence to fix the rest of these little things myself and save hundreds of dollars along the way. And you've been great for my social life.
My chick is like "That's so sexy!". #Winning!
Junior Member
Joined: Mar 2013
Posts: 26
Likes: 0
2001 C320
Great write up and I plan on doing this very soon; quick question though: how do you "torque to spec" — what does that even mean? Am I counting the number of times I'm turning the socket with the new spark plug?
Thanks
Thanks
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From: Austin, TX
2005 C230K(sold), Mk7 Jetta
Member
Joined: Feb 2014
Posts: 134
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From: New Hampshire
C 32 AMG & FG2 Civic Si
Hi guys, this thread really helped me on my C32 tonight, so thanks to the OP. I'm HUGELY stuck though. Everything went pretty smoothly until I went to plug the boots back onto the spark plugs. I cannot for the life of me get them on snugly!
I tried for a solid hour with tons of different methods, even putting a small wrench into the box end of the 17mm offset wrench and trying to leverage that with my arm. Any harder and I would have broken my arm. Am I missing something here? I even put a bunch of dielectric grease on the inside of the boot and on the spark plug itself!
Any help/tips are appreciated. I've got no working car now! Thanks
I tried for a solid hour with tons of different methods, even putting a small wrench into the box end of the 17mm offset wrench and trying to leverage that with my arm. Any harder and I would have broken my arm. Am I missing something here? I even put a bunch of dielectric grease on the inside of the boot and on the spark plug itself!
Any help/tips are appreciated. I've got no working car now! Thanks
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
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From: Huntington Beach, Ca.
'17 Jaguar XF
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
If I understand the situation correctly - the connectors are larger now. You might try to unscrew the connector from the old plugs and screw them on the new ones.
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Posts: 1,434
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
If you pay close attention, you can feel the crush washer compress when you start to get the plug tight. Then, as CClassLover says, another firm but not forceful turn. The chances of stripping the threads in the head are slim since the length of the threaded part of the plug is so long, but it is aluminum and there is no reason to force the issue. A bit more than snug is enough.
MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,434
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
Just a reminder - there's no need to disconnect the battery to change the plugs.
