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Founding Member 2006
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Discussion Starter · #1 · (Edited)
 

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Registered 2009 SLK55 AMG
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There's not enough room for me to work in there. Looks like I have to take out the fan... :(
 

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Registered 2009 SLK55 AMG
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306 Posts
Rubbish loads of room just like a 350 :)
Maybe for your small arms :D Already tore mine up. I don't have my "motivator", for extra torque/reach on the wrench. And, maybe I'll wait till I don't have a migraine... :/ I noticed in the video that the guy took out the fan/radiator, and STILL had problems fitting the belt on... How much "give" does the Tensioner have?
 
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**Registered 2009 SLK200
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Maybe for your small arms :D Already tore mine up. I don't have my "motivator", for extra torque/reach on the wrench. And, maybe I'll wait till I don't have a migraine... :/ I noticed in the video that the guy took out the fan/radiator, and STILL had problems fitting the belt on... How much "give" does the Tensioner have?
Small arms do have there advantages and saves a lot of time and dissmantling to . >:D
 

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Registered 2009 SLK55 AMG
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Update: Replaced the serpentine belt (the skin on my arms is a little worse for wear, I'm afraid - even though I used towels over the fan shroud). Checked all the pulleys. Everything is solid/no movement. However, the water pump whines when spun by hand. :( That's an expensive R&R, I'm told... Regardless, success! Thanks, everyone, for your expert judgment! :)
 
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I'm thinking about doing this on my 350 this week. Is there a recommended brand of belt to get? And should the tensioner be replaced as a matter of course?
 

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Founding Member 2006
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Discussion Starter · #9 ·
belt should be mb brand in my opinion
and yes, replace any parts like the tensioner and pulley while you are in there
 

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**Premium Member 2004 SLK350
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I'm thinking about doing this on my 350 this week. Is there a recommended brand of belt to get? And should the tensioner be replaced as a matter of course?
If i was you i will also drain the coolant and replece it.
Start with jacking up the car or put the car on ramps
Remove under tray
Connect a hose to radiator drain port and unscrew the screw
Disconnect the radiator electric plug
Remove the hose from thermostat and radiator
Remove electrical fan from radiator it has 2 latches on both side's and just pull it up
Now you have full acces to the belt tensioner, use a 17 or 19 mm socket with a long handle and a nail or a hex to lock the tensioner,
Now you can remove the belt and inspect the pulleys
There are 2 sizes belts be careful
Also now you can change the thermostat and thermostat gasket if you want.
Putting back the belt you start with the crank pulley
Imgur: The most awesome images on the Internet
 

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Did this job today, no problems at all. The belt was the original from 2005 and 80,000 miles so no wonder it was squeaking.
I also changed the tensioner and the 2 idle pulleys, all of which were noisy.
Used genuine Mercedes parts so a bit more expensive but I thought it better to be safe than sorry.
What a difference, the engine is now so quiet.
 

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2001 SLK320
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136 Posts
change coolant

If i was you i will also drain the coolant and replece it.
Start with jacking up the car or put the car on ramps
Remove under tray
Connect a hose to radiator drain port and unscrew the screw
Disconnect the radiator electric plug
Remove the hose from thermostat and radiator
Remove electrical fan from radiator it has 2 latches on both side's and just pull it up
Now you have full acces to the belt tensioner, use a 17 or 19 mm socket with a long handle and a nail or a hex to lock the tensioner,
Now you can remove the belt and inspect the pulleys
There are 2 sizes belts be careful
Also now you can change the thermostat and thermostat gasket if you want.
Putting back the belt you start with the crank pulley
Imgur: The most awesome images on the Internet
I understand the need of regular maintenance intervals for often driven cars. However, just brought home a 2001 SLK 320 with now 9K on the clock from a collector. Old school thought says"if it ain't broke don't fix it". Although changing coolant is not a complex job, what real evidence should prompt me to change the coolant with so few miles on the car? I understand it's cheap insurance, but i also do not like to waste resources. V
 

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I understand the need of regular maintenance intervals for often driven cars. However, just brought home a 2001 SLK 320 with now 9K on the clock from a collector. Old school thought says"if it ain't broke don't fix it". Although changing coolant is not a complex job, what real evidence should prompt me to change the coolant with so few miles on the car? I understand it's cheap insurance, but i also do not like to waste resources. V
Everything has a shelf life. Fluids and rubber hosing, belts etc included.

So, if the collector thought 'I only do small mileage, why change the fluids' they could be 16 years old.
The change routine is a combination of age, or mileage and very much a 'whichever value you hit first' scenario.

Other factors come into play, such as how the car was driven. Low mileage is not a guarantee.

If you change these things during your initial ownership then it might be safe to think that you don't need to do them again.

Some items, like brake fluid, have a very defined life span (2-3 years for peak condition).
They still work as they age, just not as efficiently.
Brake fluid loves to soak up water and this changes it's properties significantly.

Besides, when carrying out any work on the car you notice other things before they become an issue.
Can save much more money in the long run.
 

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Registered 2009 SLK55 AMG
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306 Posts
Update: Had to replace belt, again!

After driving up to Virginia (a wonderful drive up through NC & VA, AND five laps @ VIR!!!), I was waiting at a light near my home & all the warning lights came on & my steering got real hard. "That damn serpentine belt, again! Good thing it happened here!". Pulled into an auto parts store lot, got towed to a local shop. They replaced the belt, and the Idler Pulley - which broke! - and I was back home in less than 1-1/2 hrs from alert! Double-checked my installation to make sure the belt was on correctly. Either it wasn't, or it was time for that pulley to go!:grin:
 
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Hi to all just a few updates on replacing serpentine belt on 2005 (uk spec)slk200.
To release the tensioning pulley you require a male torx T60 socket which locates just below the tensioning pulley , you have to feel for it. Insert socket into cut-out and turn Anti- clockwise. The belt will slacken but you will have to keep the tension on the ratchet as there is no locking pin. Once released you can relieve the tension
Route the belt and when you are ready to place the belt over the final pulley tension pulley again and slip belt over whichever is your last loop . I would not recommend the tensioning pulley as your last loop as the ratchet gets in the way
Hope this helps
Marauder

Helpful hint from @marauder1964
 

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Registered 2005 SLK280
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If you take the fan out you can do the job easily in 1/2 hour. Just take note of how you take the belt off and you should not have a problem. I had to replace my alternator and they say you need to undo power steering tubes and a hole pile of stuff, The belt was about the only thing I had to do aside from the fan and even that you can do with next to no tools. Don't sweat it mate you'll do fine.
 

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2001 SLK320 & 2000 SLK230
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re: "new" SLK320: I'd replace all fluids & rubber components easily reached (belts hoses, tires) and put latteritems in baggies for the next owner. I'd also add Bluetooth. Check all sway bar and suspension bushings then check everything out, HVAC operation particularly. I like sheepskin seat covers.

Some things do not do well in storage, even climate controlled.
 

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2009 SLK350
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31 Posts
The procedure is documented already


I am here to convince anyone contemplating a belt replacement - don't be afraid of removing the fan. If you have the skill to replace the belt, the fan is easy. Having room to work makes this easy. I suspect the total time will be a wash because you can work so much more quickly with the fan out.
 
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