Alternator Whine

[S2G-Unit]

Last year, i think my alternator began to whine. So let's say it is the alternator once it's tested.

So should I rebuild mine locally?

Buy one of these from ebay?
http://www.ebay.com/itm/400556990437?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT

Buy parts from this Honda list & have a shop rebuild it?
http://www.acuraautomotiveparts.org...omp=List All&vinnoT=&trim=&trans=&view=normal

 

[JW]

Or try this one from the parts for sale on Prime.

http://www.nsxprime.com/forum/showt...e-less-than-500-miles)-Part-101211-7570-CLG18



91 NSX Red/Black
09 VW Jetta TDI White

 

[imflipside]

Are you sure?

I thought I was having alternator problems last year, but it tested fine. Turned out to be the accessory pulley bearing. An easy fix. They sounded the same to me, the clue was that the whine went away and came back - I think a failing alternator gets worse and worse until it completely fails.

 

[S2G-Unit]

Or try this one from the parts for sale on Prime.

http://www.nsxprime.com/forum/showt...e-less-than-500-miles)-Part-101211-7570-CLG18


91 NSX Red/Black
09 VW Jetta TDI White

Thanks, emailed him.

I thought I was having alternator problems last year, but it tested fine. Turned out to be the accessory pulley bearing. An easy fix. They sounded the same to me, the clue was that the whine went away and came back - I think a failing alternator gets worse and worse until it completely fails.

Any idea of part # for that bearing? I can't find it?

 

[Larry Bastanza]

So to be clear, you are talking about the A/C belt tensioner pulley, correct?

 

[S2G-Unit]

So to be clear, you are talking about the A/C belt tensioner pulley, correct?

Seems to be the problem that many people have if not the alternator, right?
Is it this part number? 38942-PR7-A00

Timing belt was done 2 years ago, accessory belts were changed also. The whining noise started after that. I think there was also a grumbling, slight grinding noise also (but not input-shaft or throwout bearing noise)
If I decide to change some bearings & pulley's, which other ones should I change at the same time?
Approximate amount of hours to change them?

Thanks Larry,

 

[Honcho]

I had the whine. Replaced my A/C belt tensioner pulley and now the car is silent. 90k miles.

 

[S2G-Unit]

I had the whine. Replaced my A/C belt tensioner pulley and now the car is silent. 90k miles.

Is this the part #?
38942-PR7-A00

 

[Honcho]

Is this the part #?
38942-PR7-A00

Yes

 

[S2G-Unit]

Thanks.

Now guys, for my potential alternator (car is a 1994).
Should I

Buy one of these from ebay?
http://www.ebay.com/itm/400556990437...:MEBIDX:IT

Buy parts from this Honda list & have a shop rebuild it locally?
http://www.acuraautomotiveparts.org/...s=&view=normal

The alternators in the for sale section are for 95+ unfortunately.

 

[Honcho]

Have it rebuilt. no need to drop $$$ on a new one.

 

[Valhalla]

Agree with Honcho. I had the whine too. Pulled the alternator and replaced both bearings. While it was out I polished the case too. I think the bearings cost me ~$40 for both thru Acura. Not hard to do but you will need pullers in order to get the bearings out of the case.

 

[imflipside]

So to be clear, you are talking about the A/C belt tensioner pulley, correct?​

Asimo Motorsport "Personal Car Care for your NSX" [email protected]
PRESIDENT NSXCA
"Opportunity is missed by most people because it is dressed in overalls and looks like work." - Thomas A. Edison
​

Yes.

 

[Honcho]

I always have my starters and alternators rebuilt around 100k miles for all my cars. Most shops will do this for about $50 each. They replace bearings, brushes and rectifiers. You basically get a brand new part.

 

[BATMANs]

I think my alternator is going too after 125k~ miles. Is that how long they typically last?

Does it whine first and then make some intermittent metal on metal rubbing/loose parts sorta noise?

Has anyone opted to have their alternator rebuilt with an upgrade to 300 amps?