For E430, ML430, E500, E55. S500, CL500, and SL500 through 2003. Every M112 V8 I have worked on starts making front engine bearing noise around 90K to 100K. Almost like clockwork! This is a service you will want to perform whether you have had your Benz for a long time or just purchased one. Don't ignore this or you will end up getting strandend when your engine throws the serpentine belt. The three most neglected maintenance jobs I see on these cars (even when well maintained) are cabin air filters, front engine accessory bearings, and motor mounts.
Product Details
Replacement of these parts is so easy (especially compared to other engines) that this is definitely a job you can do yourself with minimal hand tools. If you need any additional details not included in the on-demand video, just google this subject. There is lots of information online.
Kent has developed a special tool to make installation a "snap." Now included free.
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M112 V6 Engine Accessory Drive Belt 100K Service Kit
For E320, ML320, C240, C280 and C320. Every M112 V6 I have worked on starts making front engine bearing noise around 90K to 100K. Almost like clockwork! This is a service you will want to perform whether you have had your Benz for a long time or just purchased one.
M112 M272 V6 M113 M273 V8 Belt Tension Release and Drive Belt Install Tool Set
Includes a long custom bent 3/8 extension, correct socket, plastic mirror, and locking pin. You add another 3/8 extension to make the job a snap. Watch the video below for a full explanation of this tool and how it works.
M112 V6 M113 V8 Drive Belt Tensioner Pulley
You will have to remove the drive belt to change this pulley. Once that is done replacement is easy. The free video instructions by Kent will show you how to do this as well as the proper way to remove and replace the drive serpentine belt.