SLK320 spark plug DIY - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 03-11-2017
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SLK320 spark plug DIY

Is there a thread about the spark plug service on the SLK320? I thought there was one, but I sure can't find it. I did the job once before with help from this forum and I feel comfortable doing it again, but I just wanted to review things before I went at it. I thought it was here that I found out about using the special tool to help with the removal of the plug wires.

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#2 Old 03-11-2017
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I think there is one too.

Perhaps it is within another thread like cylinder head rebuilds?

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#3 Old 03-11-2017
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Your lucky day, maybe.

I can't see photos at the mo, but here it is.
https://www.slkworld.com/slk-r170-cla...park-plug.html

It is supposedly stickied but I don't see it there.
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#4 Old 03-12-2017
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Okay, thanks. That's a good review. Too bad the photos are gone.

Len
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#5 Old 03-12-2017
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Definitely need the tool to get the boots off. I think you can get one on ebay for cheap.
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#6 Old 03-12-2017
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I've got the tool - borrowed it from an old time Mercedes mechanic.
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#7 Old 03-12-2017
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https://www.slkworld.com/slk-r170-cla...v8-motors.html
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#8 Old 03-18-2017
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Did half the plugs today, i.e. the right (passenger) side. Took maybe an hour and a half, but I work slowly. No surprises. No anti-seize used or recommended. Torque to 28 nm. Used a dab of dielectric grease in the wire connectors. Had the recommended tool and it was very, very helpful both to remove and to reinstall the connectors. I wouldn't recommend doing the job without it. Only plug that gave me any trouble was the one closest to the firewall. Had to get a little creative with my extensions to get it out. BTW, used a 3" extension on all of the plugs except that one at the firewall. All the plugs came out without any serious difficulty. Hope to get the next six in the next day or so.

Old plugs had less than 20K miles on them, but they had been in there for over seven years. Plugs are a 100K mile/five year service. Car will be going to my daughter this spring, so I figured if I changed them out now that she would never have to mess with them. If I was keeping the car, I might have let it go a little while longer.
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Len
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1959 220S Cabriolet - sold - now lives in Malta
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#9 Old 03-19-2017
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Why do they need replacing after five years, with low mileage? They don't seem the sort of product that degrades over time, only degrading with use.
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Originally Posted by Australian View Post
Why do they need replacing after five years, with low mileage? They don't seem the sort of product that degrades over time, only degrading with use.
Worth looking at.

As the car is going to his daughter he is making sure it is the very best condition.

Avoiding the potential for a 4am call that starts 'Daaad!...'
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#11 Old 03-19-2017
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Oh, yeah. I missed that bit. I've had one or two of those. Luckily at a more civilised hour!
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#12 Old 03-19-2017
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Quote:
Originally Posted by Australian View Post
Why do they need replacing after five years, with low mileage? They don't seem the sort of product that degrades over time, only degrading with use.
I'm guessing that it may be a CYA thing with Mercedes so they don't get complaints from owners not being able to remove fifteen year old original spark plugs from the block without doing damage. Their response would like be, "Hey, not our fault. We said that those plugs need to come out every five years."

Len
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1959 220S Cabriolet - sold - now lives in Malta
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#13 Old 03-19-2017
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Quote:
Originally Posted by Avel Du View Post
Worth looking at.

As the car is going to his daughter he is making sure it is the very best condition.

Avoiding the potential for a 4am call that starts 'Daaad!...'
And since my daughter will be driving the car 2500 miles to her home in AZ, I wanted everything to at least start out in good condition.
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Len
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#14 Old 03-19-2017
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Did the last six plugs today. Took about an hour. It went a little quicker because I knew what I doing and the plugs on the left (driver's side) were a little easier to get to. Took the car for a ride and all seems good. I'll still hook up a scanner to make sure there are no fault codes that I'm not aware of.
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Len
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles
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