Cabrio V8 Fan Belt

[mike woodley]

The fan belt on my SD1 Rover 3500cc V8 engined Cabrio has started to fray. I noticed that the belt vibrates sideways around 2000 revs, which you can feel in the car. I discovered the fraying when investigating what was causing the vibration. I originally used a 975mm x 10mm wide drive V belt. My question is I believe that the original belt was 13mm wide, should I replace my 10mm wide V belt for a 12-13mm wide V belt? I do not have a "serpentine" type auxiliary drive system. Any advice much appreciated. Thanks in anticipation. Mike

[greyV8pete]

Quick fix is to fit a new wider fan belt and see if it cures the vibration. If not then check that you haven’t got a loose pulley or a broken alternator mounting / bracket that would be causing the belt to run out of true. In fact check that first as it could be the reason that the fan belt is frayed.

[dave_kitson]

For reference, my car with same set up as yours, has 1000 x 13mm belt. No problem with fraying after 34000 miles. 10mm belt may be too low in grooves? I remember having to make my own adjustment bracket, as Marlin only supplied the mounting bracket, so there could be some variation there, Dave