BMW 5251 Service Manual page 49

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6-cylinder engine with hydraulic belt tensioners.
Use long-handled wrench to turn
A/C
belt tensioner (A)
clockwise. Remove
A f C
belt.
* Similarly, turn main engine drive belt tensioner (B)
clockwise and remove belt.
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Some models have a dust cover over belt tensioner release
lug, which must be pried off prior to removing belt.
4
6-cylinder engine with spring-loaded belt tensioners.
Use long-handled wrench to turn
A f C
belt tensioner
release lug (A) clocltwise (against spring tension).
Remove
A f C
belt.
Similarly, turn main engine drive belt tensioner lug
(B)
clocltwise and remove belt.