Shouldn't be that tight. An overly tight belt WILL put an early death to alternator bearings, I learned that the hard way on a Jaguar.
Is the Goodyear a 2145 mm long belt? I always use Conti and never had a problem on the 124. The 123's have a myriad of lengths and its easy to get the wrong ones if your aren't careful.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!