Alternator Squeal

[blackwolf0578]

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can anyone tell me if alty has replacable bearing in... car not long had major sevice and new alty pulley and belt

 

because when cold sounds like metal on metal and batt light flashes... rev engine for 1-2 mins and all is fine

 

please help before it's somethin major AGAIN... :(

[seatkid]

read most posts on similar topics

 

can anyone tell me if alty has replacable bearing in... car not long had major sevice and new alty pulley and belt

 

because when cold sounds like metal on metal and batt light flashes... rev engine for 1-2 mins and all is fine

 

please help before it's somethin major AGAIN... :(

I'm inclined to think its not bearings as once a bearing starts squealing they usually dont stop and probably seize up completely in a matter of minutes.

 

Either you have a problem with short term massively excessive load - a duff battery springs to mind, or more likely an electrical fault in the alternator.

Also check the fuse box that the heavy cable from the alternator runs to. Look for signs of overheating (it will be obvious).

[blackwolf0578]

ta seat kid will do and let you know

(can always rely on you m8) :(

[turk90210]

I agreed with SK re the bearings

you mention that you have had a new pully and fan belt, was this an attempt to cure said noise or has the noise only developed since these parts were replace!

something else you can try if confident enough

when cold remove the fanbelt and turn by hand all the pully's that the fanbelt spins and see how they feel (should be smooth if the bearings are ok might feel rough if they are going) also while the belt is off start the engine up and see if the noise is still there, if it is you know that the ancilleries are all ok(alternator power steering ect) and the fault lies on the engine if there is no noise with the belt off you can then try (with the belt back on) placing a long screwdriver or bar on the components (alternator tensioner ect) and placing the other end next to your ear and note the noises you can hear when the engine is running. This isn't an exact science but might help you in pinpointing where the noise is coming from BUT BE CAREFUL of moving objects

You also say the noise sounds like metal on metal and the alt light flickers, have a close inspection around the pullys to see if there are any metal filings especially around the alternator pully and the internal fan on the alternator

[Audiman]

Sounds like a faulty alternator pulley - see post's on possible symptoms

[blackwolf0578]

hi all again

 

well noise still there and batt light flashes only when engine cold though,like i say only for minute at most

here's the strange thing on motorway in bit of a rush today doin 70 +10%+ 3 etc 3750rpm and batt light starts again so as next jcn was mine slowed to 60 as came up exit ramp the flashing stopped couldn't hear any sqealing cos of wind noise etc and again no problems on way home??????????????????????? :25: :wacko: :wacko: oh and pulley was replaced cos self tentioner was defunked

p.p.s. sometimes wd 40 cures it but not always

 

all contributions gratfully received :16: