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  #1  
Old 11-06-2004, 03:31 PM
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Join Date: Nov 2004
Posts: 2
Ml 320 Spark Plugs

Trying to change the plugs on my 1999 ml320 and having some difficulty. I'm using a long bar plug spanner but am having to exert quite unusual force to free the plug and I don't want to break something. I wondered if somehow the conventional spanner is jamming. Is there a special plug spanner required or will I just have to force the issue? Any constructive help appreciated . . .
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  #2  
Old 11-06-2004, 03:43 PM
carson356
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boot puller

if they are tight just turn them slowly they will free up, use a short as extension as you can get in there as close as possible.
here is a link to the tool for the boots. it is actually a bent 17mm wrench. if you order the tool from mercedes they will send you a valve adjusting wrench from the old m110 motors which is mercedes part number 110-589-01-01-00. i have it and use it everytime i do the plugs on a 112 engine works great. the tool for the plugs is 112-589-01-09-00 it looks like a conventional wobble socket plug. what plugs are you using? if you have mor questions or need more info email me. i also have the service sheet for the ML's i can send it too you, too bid to post here
Ray
mercedessd@cox.net

plug boot tool
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  #3  
Old 11-06-2004, 10:38 PM
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Join Date: Jan 2000
Location: Carol Stream, Il, USA
Posts: 605
If your plugs are original then they will be difficult to get out. The plugs are good for 4 years or 100,000 miles (which ever comes first).

Like Carson356 suggested, use a short extension and turn them slowly (ease them out). Take your time doing this or you may end up with broken plugs - also make sure the engine is at room temperature (not warm or hot).

I prefer to use dielectric grease inside the boots and high temp anti-seize compound on the threads - it makes removing the plugs easier the next time they need to be changed.
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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles
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  #4  
Old 11-12-2004, 01:46 AM
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Join Date: Nov 2004
Posts: 2
Thanks for taking the time and trouble to post your helpful advise. Other chores have kept me from tackling the job but I'll get round to it in due course.
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