W211 E55 Idler Pulley and S/C Belt Size
Thread Starter
Super Member
Joined: Jan 2010
Posts: 566
Likes: 4
E55
W211 E55 Idler Pulley and S/C Belt Size
Hi all,
In December 2020, I replaced the OEM idler pulley's (both 6 and 8 ribbed) to the dual idler pulley's from VRP. Upon installation of the VRP idler pulley's, the OEM bolt was sticking out a little bit (maybe due to the lack of size of the VRP 8 ribbed pulley compared to the OEM one) so the mechanic did a custom fitting. When I turn the car on, those pulleys wobble a bit and create noise from under the hood. In the past year, I've replaced at least 3 s/c belts due to the belts either shredding or slipping. I'm under the impression it is from the aftermarket pulleys so I will be going back to the OEM idler pulley set.
So, if I were to go back to the OEM 6 & 8 ribbed idler pulley's and my car has a stock s/c pulley (90mm) along with a 180mm crank pulley (stock is 152mm I think), what would be the correct size of the s/c belt I should get?
After reading this thread: https://mbworld.org/forums/w211-amg/...t-numbers.html, I see that the stock s/c belt size is 1289mm but I have don't have the spacers that are discussed in this thread to do the calculation mentioned; everything is OEM aside from what I mentioned above.
The current belt size I was using that got shredded was a 520K8 Micro Rib Poly V-belt: 52.75 inches and 1339.85mm.
I just purchased a 522K8 Micro Poly V-belt: 52.95 inches and 1344.93mm in the hopes that this one won't shred or slip.
Is there a way to get a very close estimate of the measurement I would need to avoid this problem from constantly occurring?
In December 2020, I replaced the OEM idler pulley's (both 6 and 8 ribbed) to the dual idler pulley's from VRP. Upon installation of the VRP idler pulley's, the OEM bolt was sticking out a little bit (maybe due to the lack of size of the VRP 8 ribbed pulley compared to the OEM one) so the mechanic did a custom fitting. When I turn the car on, those pulleys wobble a bit and create noise from under the hood. In the past year, I've replaced at least 3 s/c belts due to the belts either shredding or slipping. I'm under the impression it is from the aftermarket pulleys so I will be going back to the OEM idler pulley set.
So, if I were to go back to the OEM 6 & 8 ribbed idler pulley's and my car has a stock s/c pulley (90mm) along with a 180mm crank pulley (stock is 152mm I think), what would be the correct size of the s/c belt I should get?
After reading this thread: https://mbworld.org/forums/w211-amg/...t-numbers.html, I see that the stock s/c belt size is 1289mm but I have don't have the spacers that are discussed in this thread to do the calculation mentioned; everything is OEM aside from what I mentioned above.
The current belt size I was using that got shredded was a 520K8 Micro Rib Poly V-belt: 52.75 inches and 1339.85mm.
I just purchased a 522K8 Micro Poly V-belt: 52.95 inches and 1344.93mm in the hopes that this one won't shred or slip.
Is there a way to get a very close estimate of the measurement I would need to avoid this problem from constantly occurring?
Thread Starter
Super Member
Joined: Jan 2010
Posts: 566
Likes: 4
E55
Regardless, I’m going to be switching back to the OEM setup to avoid this from happening in the future.
SPONSOR
Joined: Jul 2016
Posts: 3,024
Likes: 395
From: Colorado, USA
E55 C63
Hello!
We're very sorry to hear you've experienced these issues for so long and we would love to help you find a solution even if you are going back to OEM.
Our new tech specialist is ready to give you some answers whenever you are available.
If you would like, you can e-mail a photo of your current set up and any specific details/questions you have to tech@vrpspeed.com.
We are in the office 10am - 5pm MST.
We're very sorry to hear you've experienced these issues for so long and we would love to help you find a solution even if you are going back to OEM.
Our new tech specialist is ready to give you some answers whenever you are available.
If you would like, you can e-mail a photo of your current set up and any specific details/questions you have to tech@vrpspeed.com.
We are in the office 10am - 5pm MST.
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
Hi all,
In December 2020, I replaced the OEM idler pulley's (both 6 and 8 ribbed) to the dual idler pulley's from VRP. Upon installation of the VRP idler pulley's, the OEM bolt was sticking out a little bit (maybe due to the lack of size of the VRP 8 ribbed pulley compared to the OEM one) so the mechanic did a custom fitting. When I turn the car on, those pulleys wobble a bit and create noise from under the hood. In the past year, I've replaced at least 3 s/c belts due to the belts either shredding or slipping. I'm under the impression it is from the aftermarket pulleys so I will be going back to the OEM idler pulley set.
So, if I were to go back to the OEM 6 & 8 ribbed idler pulley's and my car has a stock s/c pulley (90mm) along with a 180mm crank pulley (stock is 152mm I think), what would be the correct size of the s/c belt I should get?
After reading this thread: https://mbworld.org/forums/w211-amg/...t-numbers.html, I see that the stock s/c belt size is 1289mm but I have don't have the spacers that are discussed in this thread to do the calculation mentioned; everything is OEM aside from what I mentioned above.
The current belt size I was using that got shredded was a 520K8 Micro Rib Poly V-belt: 52.75 inches and 1339.85mm.
I just purchased a 522K8 Micro Poly V-belt: 52.95 inches and 1344.93mm in the hopes that this one won't shred or slip.
Is there a way to get a very close estimate of the measurement I would need to avoid this problem from constantly occurring?
In December 2020, I replaced the OEM idler pulley's (both 6 and 8 ribbed) to the dual idler pulley's from VRP. Upon installation of the VRP idler pulley's, the OEM bolt was sticking out a little bit (maybe due to the lack of size of the VRP 8 ribbed pulley compared to the OEM one) so the mechanic did a custom fitting. When I turn the car on, those pulleys wobble a bit and create noise from under the hood. In the past year, I've replaced at least 3 s/c belts due to the belts either shredding or slipping. I'm under the impression it is from the aftermarket pulleys so I will be going back to the OEM idler pulley set.
So, if I were to go back to the OEM 6 & 8 ribbed idler pulley's and my car has a stock s/c pulley (90mm) along with a 180mm crank pulley (stock is 152mm I think), what would be the correct size of the s/c belt I should get?
After reading this thread: https://mbworld.org/forums/w211-amg/...t-numbers.html, I see that the stock s/c belt size is 1289mm but I have don't have the spacers that are discussed in this thread to do the calculation mentioned; everything is OEM aside from what I mentioned above.
The current belt size I was using that got shredded was a 520K8 Micro Rib Poly V-belt: 52.75 inches and 1339.85mm.
I just purchased a 522K8 Micro Poly V-belt: 52.95 inches and 1344.93mm in the hopes that this one won't shred or slip.
Is there a way to get a very close estimate of the measurement I would need to avoid this problem from constantly occurring?
__________________
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
