Serpentine Belt Broke
#1
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S550, ML350 BlueTec
Serpentine Belt Broke
I have a 2007 S550 with 91,000 miles that the serpentine belt broke twice in 10 days. Both times the car was towed in the dealer for replacement.
When the serpentine belt broke the first time, the dealer reported that the cause of the belt breaking was idle pulley failure, causing damage to water pump and tensioner. Parts replaced where: TS Water Pump (Part #273-200-02-01-80); Guide Pulley (Part #272-202-00-00); and Belt Tensioner (Part #272-200-02-70).
Ten days later the serpentine belt broke again and another tow to the dealer. I have not yet picked the car up. Now the dealer tells me the car will not start. The battery was replaced a month ago after I reported that car was starting slow. Waiting to hear what the problem is now.
When the serpentine belt broke the first time, the dealer reported that the cause of the belt breaking was idle pulley failure, causing damage to water pump and tensioner. Parts replaced where: TS Water Pump (Part #273-200-02-01-80); Guide Pulley (Part #272-202-00-00); and Belt Tensioner (Part #272-200-02-70).
Ten days later the serpentine belt broke again and another tow to the dealer. I have not yet picked the car up. Now the dealer tells me the car will not start. The battery was replaced a month ago after I reported that car was starting slow. Waiting to hear what the problem is now.
#4
I know that it's a different engine, but on my S63 I managed to shred a serpentine belt. I checked my pulleys and found that one of the plastic grooves pulleys was damaged to the point that was cutting the serpentine belt.
I would put my hands on each pulley and inspect for damage, or even debris between the grooves of a pulley.
The combination of new pulleys and a continental elite belt solved my problem.
I would put my hands on each pulley and inspect for damage, or even debris between the grooves of a pulley.
The combination of new pulleys and a continental elite belt solved my problem.
#5
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Mine shredded the other day. And before all that happened. I got squeaky noise from the pulleys. Replaced it with a new one from the dealer and it snapped again. So I'm ordering a whole new pully, and belt set to see if that would solve the problem since one of the pully seem like it's going bad anyways. My car has 63k miles.
#6
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How can belt pulleys go bad at 63k miles. that is crazy, reminds me of 1970s era detriot junk that lasted 70K miles.
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#8
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Dave, I laugh at your comment for many reasons. I had a Cutlass Calais with a 231 V6. I think I sold it to a friend around 80k miles. It finally died from a bad transmission at 115k miles. It helped to do oil changes often. I remember having to feather the accelerator in hot weather to get it going otherwise it would die. Remember these we're carbureted engines. Back then GM didn't have its act together. Took them bankruptcy to finally put some good cars out there. Like I said, I laugh because of the memories your comment brought back to me. And your comment is true.
Last edited by KNBS550; 03-02-2017 at 09:52 AM.
#10
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Actually, I was going to call you Mike. But at the time I was thinking of another Super Member, Jason, and his white W221 when I was posting.
#11
Guys... if I may, I started my car the other morning only to be met by a big red battery sign on the dash. The car only does on average 100 miles a week if any. Anyway as I was changing my battery, I noticed the serpentine belt was loose. It had fallen off and was just sitting there. I managed to get the belt back on and so far car is ok. Now I think it had been like that for awhile. My question is, will car still drive even if the belt is off?
#12
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2010 e550 p2
Guys... if I may, I started my car the other morning only to be met by a big red battery sign on the dash. The car only does on average 100 miles a week if any. Anyway as I was changing my battery, I noticed the serpentine belt was loose. It had fallen off and was just sitting there. I managed to get the belt back on and so far car is ok. Now I think it had been like that for awhile. My question is, will car still drive even if the belt is off?
but on a serious note , NO , because the belt runs all of the pumps that are needed for a proper operation.
so if its loose ( its either old/cracked/etc)id replace it ASAP , it kinda depends on your luck.
also check a tensioner and a water pump.
#13
Thank you
yes it will drive , for a minute and then overheat lol
but on a serious note , NO , because the belt runs all of the pumps that are needed for a proper operation.
so if its loose ( its either old/cracked/etc)id replace it ASAP , it kinda depends on your luck.
also check a tensioner and a water pump.
but on a serious note , NO , because the belt runs all of the pumps that are needed for a proper operation.
so if its loose ( its either old/cracked/etc)id replace it ASAP , it kinda depends on your luck.
also check a tensioner and a water pump.
#14
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2010 e550 p2
Thank you. I kind of thought the water pump was gone as I can see a bit of a mark under the bonnet when I move the car and I can see drips from what I think is the water pump. I had the car serviced with Mercedes in October then in Jan I got the coolant low warning. I topped up and again I had the warning two weeks ago. I definitely think water pump. Thanks you have confirmed what I thought
good luck , and post back what was the issue.
#15
help please
I need a bit of help, please. Working in systems architecture did not gear me up enough for the car world. Attached is a pix and the marked item has some form of a leak. I suspect that will be the coolant pump but I may be wrong. Will someone please confirm. (Pix taken from the top)
MB wants too much money even to diagnose the issue and be it I had it serviced five months ago, I am reluctant to pay.
Also what could cause the serpentine belt to come off?
Thanks all.
MB wants too much money even to diagnose the issue and be it I had it serviced five months ago, I am reluctant to pay.
Also what could cause the serpentine belt to come off?
Thanks all.
#16
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2010 e550 p2
the cause of its coming off can be stretched/cracked/old belt or one of the components that its running could be the cause (if its not operating right)
maybe a belt tensioner... etc
a lot of possible scenarios
maybe a belt tensioner... etc
a lot of possible scenarios
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dj077 (03-21-2017)
#18
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2010 e550 p2
not the pro at these but looks right to me
https://mbonlineparts.com/parts/2007...agramCallOut=6
http://www.ebay.com/itm/Mercedes-Benz-2732000201-ENGINE-WATER-PUMP-KOOLMAN-NEW-CL550-CLK550-G450-G550-/111831084486?hash=item1a09a6edc6:g:8eAAAOSwbdpWUn8 w&vxp=mtr
https://mbonlineparts.com/parts/2007...agramCallOut=6
http://www.ebay.com/itm/Mercedes-Benz-2732000201-ENGINE-WATER-PUMP-KOOLMAN-NEW-CL550-CLK550-G450-G550-/111831084486?hash=item1a09a6edc6:g:8eAAAOSwbdpWUn8 w&vxp=mtr
Last edited by belarus27; 03-21-2017 at 02:35 PM.
#19
#21
That's wonderful. thanks. Unfortunately I cannot get under the car but looks like its somewhere under the pump. It still baffles me as to how the belt will fall of because of the water pump. Anyway I am getting a new pump and a new belt and betting MB to fix it. I hope that fixes the issue.