Alternator bearings
#1
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Year: 2000
Model: Cherokee
Engine: 4.0
Alternator bearings
Have had a whistle noise from under the hood that is present at idle and changes pitch with increasing throttle..... thought it was a vacuum leak but my mechanic says it's coming from the alternator as he thinks the bearings are going..... sound plausible?
#2
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Very possible. But it can also be any of the other pulleys too. The best way to check is remove the belt and give each pulley a spin by had also see if any of them have extra play. They should spin smooth with out any slop to them.
#3
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
X2^ Also a bad bearing will get hot, (at some point). You might start it cold, run it a few minutes then turn it off and check for heat. Also you can listen with a hose or tube. Good luck!
#4
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Year: 1989
Model: Cherokee
Engine: 4.0L I6
If you don't want to worry about taking it off, just listen with a hose or a mechanic's stethoscope (approx. $10 at Harbour Freight/Princess Auto). If the bearings are bad on a pulley, it should be pretty obvious.
#5
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Year: 1993
Model: Cherokee
Engine: 4.0L
If it does turn out to be the alt, an auto electrical shop can replace the bearings and brushes in short order, ~ $45 here but I assume a bit more in Boston. My bearings went about 5 years ago, pretty much completely locked up but making very little noise amazingly enough
#6
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Year: 1989
Model: Cherokee
Engine: 4.0L I6
Otherwise, you can just get a new 100A alternator for around $100. Both good options, if it was me I would replace it if it is an old alternator. They are ridiculously easy to replace on the XJ. (unless perhaps you have some skid plating that would interfere).
#7
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Year: 2000
Model: Cherokee
Engine: 4.0
I agree... Advance Auto has em and with on-line coupon codes it'll be under $100..... thanks.
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