something on my m103 engine sounds kinda rough, I think it may be the fan- when you turn it by hand, after about half a turn there is some resistance then moves smoothly again and so on.

When the engine is running it sounds like if you were to apply some resistance to say, an electrical motor, say holding your hand against it, then let go again , if that makes any sense!

the noise comes from the fan/ accesory belt area at the front of the engine.
I have a new belt and tensioner, engine is running good (no misses, smooth idle etc).

any ideas?

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys