belt modification from V to flat VP TMD22

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superboots

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Can anyone give advice about changing the belt on a Volvo Penta TMD 22 from V type to flat type. It means replacement pullies for crank water pump and alternator - are these obtainable? I'm fed up with the existing belt getting loose after a short time so am thinking this mod might be the solution
 
Afraid I've no idea about polyvee belt conversions for your particular engine, but do know that proprietary conversion kits do not come cheap, even if available for your donk. If you prefer a DIY approach, the pulleys themselves can be sourced very cheaply from specialist pulley suppliers such as this one: http://www.pte-ltd.co.uk/ Google will no doubt find one in your area. Note that, if searching, polyvees are sometimes described by their American name: serpentine.

However...and it's a big one...you would almost certainly be in for a heap of machining work, particularly if the original pulleys are dished or belled. A slightly simpler alternative would be a HTD belt and pulleys. HTD belts are toothed rather than grooved and can happily handle heaps of torque. By fitting a slightly wider driving pulley, they will self-align to a degree. However this is unlikely to remove the need for machining to make them fit.

I agree that almost anything is an improvement on a V-belt, but the work involved might not justify it.
 
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JVL said:
Fit a Gates belt they don't stretch and make dust. Get the green stripe version.
Click to expand...
A big plus one, my MD22 used to be the same, put a Gates toothed belt on 3yrs ago? its still going strong! I originally tried a genuine VP belt, wasnt impressed!
Stu
 
Thanks for the advice - I will try a gates toothed belt first. I know how expensive changing the pullies can be. Did a similiar thing on an early D2 -55 but VP had the parts as they had become standard on current models.
 
Another thought on the benefits of doing this - you may get more output from the alternator. I did it with a Nanni using a kit that bolted over the crank pulley, replacing the other two. That changed the geometry sufficiently to start getting 80-90A from a 100A alternator instead of the max 60A seen previously.
 
i would look as to why your existing belting is coming loose...as a rule a new fitted one would need to be re adjusted after a nominal period to remove the 'stretch' of a new belt but from there on in it would seldom if ever need to be adjusted!
 
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