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. 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.
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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. I originally had planned to do a video instruction but found there are so many vidoes and information on the internet concerning this job that I decided against adding the expense and just kept the parts cost as low as possible
Here is a youtube video link to help you understand just how easy this job is: https://youtu.be/iPkRdudwK8M
Kent has developed a special tool to make installation a "snap." See related products below.
Related Products:
M112 V6 M113 V8 Belt Tension Release and Drive Belt Install Custom Tool
Designed by Kent and made right here in our shop. Watch the video below for a full explanation of this tool and how it works. Kent will demonstrate how easy it is to remove and replace the front drive (serpentine) belt on most M112 and M113 engines from 1998 to 2006.