Here's what I have been saving about the 348 alternator rebuild which I hope should help you:
348 Alternator Rebuild
I recently removed and rebuilt the alternator in my 348. A rebuilt the alternator in a 355 using updated parts is herein listed the parts used :
The old Transpo regulator (part #IN220) has a tendancy to go bad, and I think they are a piece of junk. I had the alternator rebuilt a few years ago and the shop that rebuilt it used the standard Transpo parts and they ended up failing on me again. The battery light would also come on when I would get into the upper rpm's. Well since the alternator crapped out on me I wrote down the part numbers that jm3 used on his rebuild and went to the the alternator shop to order them.
Here are the Regitar part numbers:
regulator - #VRH2005-4A
rectifier - #RN-02
Well when I ordered them the supplier to the shop told them that a company named USI made a better regulator than the Regitar. Not that the Regitar was a bad regulator but that the one USI made was just better. So I figured why not and ordered the USI regulator. That way we have two alternatives to choose from over the crappy Tranpso part. I still used the Regitar rectifier though.
Here is the USI part number:
regulator - #00632, 71-30003/SCP
Unit2 electric in Ventura was a big help in getting the parts for me.
Since I had all the stuff I figured you guys would like a how-to on the removal and rebuild, and yes I did take pictures. Oh yeah one more thing, this is for the Nippondenso alternator, so you can use the parts for a 348 or a 355.
I have successfully improved the F355 Nippondenso alternator. It would have taken one day, but I was sent on a wild goose chase by a defective-out-of-the-box regulator.
The parts to buy are:
A regulator, brand name Regitar, part number VRH2005-4A
A rectifier (optional), which needs a minor mod, Regitar RN-02
The only place I found that sells them online is http://www.holcombedirect.com/browse.cfm/2,55.html
The defective part I bought was a Transpo IN220, and during my visit to the alternator dyno, they told me that they had occasional trouble with Transpo (assembled in Costa Rica) and had the best results with Regitar (says made in USA on the box fwiw)
Dyno of totally stock alternator was 13.6 volts at 139 amps for 5 minutes.
Dyno of improved alternator was 14.1 volts at 161 amps for 5 minutes.
The gains are more from the regulator than the rectifier, we tested both.
The goal however is increased reliability. The VRH2005-4A regulator has some features that the stock one does not have in terms of circuitry to prevent shorts or failure when confronted by a battery, belt or wiring problem. The RN-02 rectifier, which is where the diodes turn AC into DC, is very heavy duty. The new rectifier is all copper instead of steel, welded diodes instead of soldered, thicker mount for the battery stud. The 6mm battery stud from the new regulator needs to be replaced with the 8mm stud from the original rectifier. This is reversible for future concours, where the rectifier part numbers must be original.
I also replaced all the tiny cheesy screws with allen bolts, which made life much easier. They are all 4mm x 0.7 pitch, and I needed 3 for the regulator 5mm long, 4 for the diodes 5mm long, and 2 for the regulator case at 20mm long. The local hardware store didn't have 5mm allens, so I shortened some 10mm ones on a sander. http://www.wi-tek.com.cn/ENGLISH/En_...?ArticleID=165 http://www.regitar.com/automotive/di...art.asp?ID=968
Elreg price quote for Delco parts:
Rectifier: 311-618XHD $8.23
Regulator: 101-670HD $9.72
Here is the Regitar regulator you'll need http://www.holcombedirect.com/browse.cfm/4,569.htm
and this is the correct rectifier http://www.holcombedirect.com/browse.cfm/4,478.htm
the Delco CS130 and the Nippodenso, stronger rectifiers are available at little cost. Finding the parts for a Delco is a click at eBay, complete kits with regulator, rectifier, bearings and brushes for something like 30$, look for “ALTERNATOR REPAIR KIT DELCO CS130”
Okay fellas hear it IS! http://www.wai-wetherill.com/product...um=1-1410-01ND
On this page they list all the parts used in the Nippondenso http://www.wai-wetherill.com/product...tem=100211-617
It comes out of a 1991-1995 Acura Legend. It's a Nippondenso 1-1410-01ND or 100211-617. I called up an Acura dealer and got a brand new price of $346. The Honda part number is 31100PY3013. It's the same part number for a 2 and 4 door Legend.
The only difference I saw was that the Acura alternator uses a INR226 regulator as compaired to the INR220 that comes out of ours. But that's okay because I'll bet the INR226 is a little bit better than the INR220.
Even though the regulator that is used in the Acura isn't the correct one I have found what CARS have the correct regulator IN220.
It is found in a:
1990-1991 Lexus ES250 2.5L engine code VZV21
1989-1990 Toyota Camry 2.5L engine code 2VZFE
1986-1989 Toyota Celica 2.0L engine code 3SGTE
The Toyota alternator part number is 27060-62040, -63020, & -63082. The alternator is a NIPPONDENSO 100211-830. Keep in mind this IS NOT our alternator. Those are just the alternators that use the IN220 Tranpso regulator that comes standard in the alternators for our 348/355's. So if you are looking for just the regulator those are the alternators that use the IN220.
my alternator update, during my 348 major service.
I ordered the Regitar regulator that Ernie found, but after finding a local major supplier with Nippondenso sources (Turbo & Electric), I ordered an original replacement direct from Nippondenso for the original regulator. The Regitar doesn't have an extra capacitor on it (extra leads that Ernie mentioned), while the original does. After waiting over 4mo. with the regulator not showing up, I put the alternator back together with the Regitar. I'm sure it will work fine. I'll probably still check with T&D and may pick up the OEM if it ever shows up, as a spare. It is much more $ than the Regitar, though.
Also, I ran into the same wrong-sized belt problem that sspooner mentioned in this thread:
The new alternator belt I had came with the 348 major kit that I bought from Ricambi a year ago. As sspooner mentioned, mine was also too small!! It barely fit on, even without the tensioner installed! When I ordered the Ricambi kit, there were only 2 options offered.... Nippondenso and Delco, so I was not aware that Ricambi lists a larger Nippondenso belt for the "90A alternator". This belt is mentioned a couple posts above by GeorgeW.
At any rate, I decided to order the belt that worked for Sspooner in his thread, and it also worked perfectly for me! It was only $9.95 at Rockauto.com , which is the only easy place I could find it. It is listed, however, as a standard part in Dayco's belt lists. It's a Dayco Poly Cog #5050310. This belt is listed as a 770mm belt. Nice to also know that Ricambi has the 144909 770mm belt if the (apparently) normal Nippondenso belt doesn't work for you.
As a side note, I'm pretty sure that my car originally had a Delco and was upgraded. Not sure how that was normally handled, but when I removed my front timing chain cover, I found two driver's side studs that were about an inch or more too long. These both had an aluminum sleeve to make up this space for the nut, and I think the original Delco bracket fit over these longer studs. I've never seen one, though, so am not 100% sure. Can't see any other reason for the excessively long studs, though.