I have a 2000 E430. I just did this job because my ac compressor froze. I went to O'reilly and bought a serpentine belt 6pk2310.(different brand has it as k0910). The numbers after the part number is the length in mm or inches. Eg. 0910 = 91 inches == 2810mm. Just follow the diagram and bypass the ac compressor. Tools: 15mm wrench for the pulley tensioner. It took me 5 minutes to do this job and be on the road again. It is very easy.
On the Right is the normal diagram.
On the left is how you bypass the AC compressor on a E320/E430 2000-2002 engine.
There is no way to use a smaller belt.You will have to replace bearing or bypass pully. Believe me I tried.
?? if your asking if you can use a shorter belt to bypass the ac compressor then the answer is "Maybe" you can only if the new path the belt takes would be the same without compressor installed , ??? not so sure how to do this . but what I have seen done is the ac compressor was moved over to make room for a new belt driven supercharger and in it's old location a surplus belt tensioner was bolted in its place . I guess a adaptation of this could be used to bypass the ac compressor , but why not just replace the ac compressor if it wont turn , used parts from the scrap yard work for this too
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