If you have access to the 103 engine manual or CD-Rom, review the section that covers serpentine belt replacement.

Try loosening the alternator and push it toward the engine. You'll gain enough slack to remove the belt. This also comes in handy when trying to reinstall a belt.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"