Serpentine Belt shredded... Help? - Mercedes-Benz Forum
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post #1 of 16 (permalink) Old 03-31-2012, 09:40 PM Thread Starter
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Serpentine Belt shredded... Help?

I left the house earlier tonight and was only about a mile or so from the house when the car started squealing. Uh-oh... I turned around and came back home. I popped the hood to find the belt shredded. So, I need help. I need a diagram or picture of how it's SUPPOSED to go on and if there's a DIY that I'm not finding it would be much appreciated. I did search but it didn't help much. Thank you in advance.

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post #2 of 16 (permalink) Old 04-01-2012, 04:26 AM
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post #3 of 16 (permalink) Old 04-01-2012, 08:26 AM Thread Starter
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Thanks for the diagram. After checking out the damage this morning, it's more involved than I thought. Unfortunately, the clutch fan took a hit and has a couple busted blades. Yay... So, anybody have a DIY for the clutch fan? Also, any idea where to get a fan besides MB? I apologize if this has been gone over a million times, but I'm freaking out right now. I recently sold the Lightning so I'm down to the car now.

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post #4 of 16 (permalink) Old 04-01-2012, 08:44 AM
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This is a PDF for removing the fan and clutch together, you can take the fan off the clutch in the car but it's a bit fiddly and will take longer.
You don't need the torque wrench, I think from memory the four bolts that hold the fan to the clutch are 6mm Allen bolts (could be 5mm).
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post #5 of 16 (permalink) Old 04-01-2012, 08:47 AM Thread Starter
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Thanks bro! I was going to replace the clutch as well for peace of mind so that's great.

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post #6 of 16 (permalink) Old 04-01-2012, 06:10 PM
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You were fortunate the damage was not more severe.

Frankly 99% of the time the reason the belt sheredded was failure of one or both of two other parts: old style belt tensioner, and/or idler pulley. Replacement of the fan clutch should not be neccessary.

1) Belt tensioner: the OE replacement (recommended) is made by Litens and is aftermarket $120. China no-name/quasi brand (not recoemmended) are like $60 and beware most retail auto parts stores only sell the China made for up to a lot of money. The China one has serious failure issues. The updated style Litens (original style was short lived) will last the rest of your life.

2) The idler pulley/wheel OE is Luk/Ina at $21, the China no-brand/quasi brand can be as low as $10, and are also marketed under many retail store brands. I can offer no comment since I have never used anything other than Luk/Ina - which has about 100K mile life. Gates has a 3rd version for a bit over $30 "tech" design, I have never used that either.

3) Belt: Conti or even Gates should be like under $35

4) Fan Blade: Febi makes a OK replacement like $55. MB brand OE is like $55 on parts.com. China made replacements are like $35. I have used the Febi with no issues.

5) Fan clutch: this is a viscous clutch so if it starts failing it slips, never seizes. The Sach OE is like $250, the China made sh*t replacement is as low as $80 and no-brand/quaisi brand marketed for up to $200.

6) Fan clutch 2pc tool set: 2PCS Mercedes Benz Fan Clutch Wrench Water Pump Holder | eBay

Most oft mentioned parts sources autohausaz.com, Sunday night order on in stock parts will ship out Monday, or parts.com for MB parts.

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post #7 of 16 (permalink) Old 04-03-2012, 12:29 PM Thread Starter
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I have the parts ordered. And I'm about the order the tool that fabbrisd1 linked to. My next question is how do I relieve Tension to install the belt? Special tool? I have a Serpentine Belt tool for my Ford vehicles but I doubt it would work.

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post #8 of 16 (permalink) Old 04-03-2012, 01:24 PM
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It's just a small torx bolt but you can get away with a ring spanner if you don't have a female torx, just lift hard and it will release the tension . Watch your fingers!

Quote:
Eric Cantona quotes
When the seagulls follow the trawler, it is because they think sardines will be thrown into the sea.
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post #9 of 16 (permalink) Old 04-03-2012, 01:39 PM
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Originally Posted by Gray_Ghost View Post
I have the parts ordered. And I'm about the order the tool that fabbrisd1 linked to. My next question is how do I relieve Tension to install the belt? Special tool? I have a Serpentine Belt tool for my Ford vehicles but I doubt it would work.
It depends. If you have the old-style tensioner (with a threaded shaft extending through a nut on the pulley) you do it as Shaune55 indicated. If you have the newer style tensioner (and the suggestion you're getting is to replace it if you have the old one) there is a hex-head cast into the housing. Put a wrench (17mm? 19mm?) on it and push down to release tension.

Replacing the idler pulley is a giant PITA on that engine, you have to pull or at least angle the radiator out of it's support to clear the bolt.

Good luck.




Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #10 of 16 (permalink) Old 04-03-2012, 02:31 PM Thread Starter
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Thanks guys. It's the older style with the Torx head on it. I've checked the pulleys though and all spin freely and no noise so I think the belt was just worn out as it seperated at the ribs. What size is that Torx bolt?

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