Whining Leece Neville alternator.

[jenevers]

I have a 180A Leece Neville alternator. The whining noise it makes, overrides the sound of my 4LW. Is this a common problem?

[bizzard]

Probably a bearing. Remove the belt and spin it by hand, it should spin quietly and smoothly. If you think it might be the belt whining flick some water on it whilst the engines running, it should quieten for a short time if it is it.

Edited June 15, 2018 by bizzard

[Boater Sam]

I had one that wrecked its front bearing, Prestolite were very good and changed it.

180A? its on a polytvee  belt? Too tight?

[cereal tiller]

9 hours ago, jenevers said:

I have a 180A Leece Neville alternator. The whining noise it makes, overrides the sound of my 4LW. Is this a common problem?

Does the Whine Noise reduce when batteries reach Higher Voltage (14 Volt plus) and less Amps.? 

[fretman]

Yes is,, they all do it, but some are worse than others, known a few buy a new replacement and it been ok, so now they have a spare.

[MtB]

11 hours ago, jenevers said:

I have a 180A Leece Neville alternator. The whining noise it makes, overrides the sound of my 4LW. Is this a common problem?

 

 

Are you sure it is the alternator? 

 

I mean, is there any possibility you have someone from the NBTA aboard? 

[jenevers]

On 16/06/2018 at 08:35, cereal tiller said:

Does the Whine Noise reduce when batteries reach Higher Voltage (14 Volt plus) and less Amps.? 

I'll check next time.

On 16/06/2018 at 07:16, Boater Sam said:

I had one that wrecked its front bearing, Prestolite were very good and changed it.

180A? its on a polytvee  belt? Too tight?

Polyvee. If it twists by 90 degrees is that about right,

tensionwise?

[Sir Nibble]

On 16 June 2018 at 07:35, cereal tiller said:

Does the Whine Noise reduce when batteries reach Higher Voltage (14 Volt plus) and less Amps.?

You know what the noise is don't you.

Also, does it rise in pitch with more revs? Always done it or recently started?

[Boater Sam]

17 hours ago, jenevers said:

I'll check next time.

Polyvee. If it twists by 90 degrees is that about right,

tensionwise?

Yes. But only on the long stretch.  Is this more of a hum than whine? Remember alternators are AC generators at heart and AC hums at high amps.

[Sir Nibble]

55 minutes ago, Boater Sam said:

Yes. But only on the long stretch.  Is this more of a hum than whine? Remember alternators are AC generators at heart and AC hums at high amps.

At these frequencies more of a whistle or whine than a hum

[jenevers]

It's a whine, at tickover, which is my normal speed. I'll have to go a bit faster.