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eric
Senior Member
Username: eric
Post Number: 59
Registered: 03-2006
| | Posted on Wednesday, December 18, 2019 - 03:12 pm: | 
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on my Lombardini DWT1404 we had to replace the alternator as it had been under the water before we got it. since replacing, it has broken about 10 fan belts?? 1st, tension of the belt was spot on. Type of belt was correct, pulley size and allignment was correct. It seems like the alternator was grabbing the beld and stopping it turning. I did notice that we had to rev it up before the light would go out. So what's the problem? can any one help.. Cheers |
miro
Senior Member
Username: miro
Post Number: 1064
Registered: 11-2001
| | Posted on Saturday, December 21, 2019 - 08:58 am: |
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It sounds like you have a bad bearing in that alternator.
Alternatively, it could be that the regulator is mis-adjusted and is set up to charge the battery too much , i.e. load is too high for the belt.
You can check this with a good analog voltmeter.
The typical charging voltage ( assuming a 12 V system) is between 13.7 and 14.2 V. If it's higher than that , you will be over-charging the battery and making the alternator put out too much current.
It means the mechanical load on the belt is higher than it would be if it were set up correctly
It might also mean that your battery is in poor condition and needs high charging current to get up to the normal voltage after you have started the engine.
I suggest a good analog voltmeter, because you'll be able to see the relatively small changes in DC voltage much easier than a digital voltmeter. The digital voltmeters sample the DC voltage and then display it which can cause some confusing displays if the DC voltage is not steady.
miro |
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