Pete The Biker
Active Member
- Posts
- 536
- Location
- Leicestershire
Hi everyone - Happy New Year.
I thought I would round off 2010 by treating my 1988 3.5 EFI Vogue SE Auto to a wash after its last pay and play day a couple of weeks ago. It had been working fine since then.
I gave it a hosing under the bonnet, not deliberately directing the jet on the alternator, but it did get wet.
I then turned the car round and noticed the ignition warning light flash briefly, but thought nothing of it until I parked the car back on the drive and a harsh grinding noise started. On investigation this was coming from the alternator. It sounded like something was stuck inside and had been caught between the rotating and static parts. Also the rev counter does not work until the engine is reved a bit and the ignition warning light is glowing until revs are increased. Sometimes the noise will come and go instantly i.e. not start gradually or fade away. Other times when I start the car there is no noise for a few seconds and then it starts when revs are increased.
I replaced the regulator, brushes, slip rings and rectifier in November and all had been working perfectly until today.
So I stripped the alternator down and found no signs of any parts rubbing against each other, or other damage. No mud inside anywhere near the working parts, and the brushes and slip rings are fine. While I had it apart I put new bearings in, just in case one of them had been damaged somehow. So I have had a good look at every component from all angles, and when reassembled the shaft spins as smooth as silk.
All to no avail - when I put it back on the car the noise was just as bad.
I also tried running the car without the alternator drive belt in case the noise was coming from an adjacent component like the power steering pump, but the noise stopped.
I had done nothing to the car today apart from hosing under the bonnet - could this have damaged the rectifier? If so I could understand the sympoms, apart from the noise.
Have any of you guys and gals got any ideas, cos I am flummoxed?
Pete
I thought I would round off 2010 by treating my 1988 3.5 EFI Vogue SE Auto to a wash after its last pay and play day a couple of weeks ago. It had been working fine since then.
I gave it a hosing under the bonnet, not deliberately directing the jet on the alternator, but it did get wet.
I then turned the car round and noticed the ignition warning light flash briefly, but thought nothing of it until I parked the car back on the drive and a harsh grinding noise started. On investigation this was coming from the alternator. It sounded like something was stuck inside and had been caught between the rotating and static parts. Also the rev counter does not work until the engine is reved a bit and the ignition warning light is glowing until revs are increased. Sometimes the noise will come and go instantly i.e. not start gradually or fade away. Other times when I start the car there is no noise for a few seconds and then it starts when revs are increased.
I replaced the regulator, brushes, slip rings and rectifier in November and all had been working perfectly until today.
So I stripped the alternator down and found no signs of any parts rubbing against each other, or other damage. No mud inside anywhere near the working parts, and the brushes and slip rings are fine. While I had it apart I put new bearings in, just in case one of them had been damaged somehow. So I have had a good look at every component from all angles, and when reassembled the shaft spins as smooth as silk.
All to no avail - when I put it back on the car the noise was just as bad.
I also tried running the car without the alternator drive belt in case the noise was coming from an adjacent component like the power steering pump, but the noise stopped.
I had done nothing to the car today apart from hosing under the bonnet - could this have damaged the rectifier? If so I could understand the sympoms, apart from the noise.
Have any of you guys and gals got any ideas, cos I am flummoxed?
Pete
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