348 alternator removal & rebuild

Did my '91 348 Delco Remy a while back, parts in the uk cost no more than equiv US 100 bucks. Bit more tricky than the ND to do as you need to get jiggy with a good heat rate soldering iron.

 

Nice post thanks, but I did'nt know 348 use Nippon Denso (Japanese) alternator, is that what they use originaly?

 

Yes,
first they fitted AC-Remy or AC-Delco but later changed for a Nippondenso.
You have to stick to the brand you find in your car, as the bracket was changed to. This applies for the 348 and the Mondial T.

Both alternators have to break in stock configuration, because the rectifier can not stand a high temperature high current situation. So after a while, first a diode goes south and then usually the regulator dies.

For both, 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”

The Nippodenso parts are a little harder to get, I found no kit.

Buying the complete alternator as original part at Ferrari will not solve the problem.

Cheers, Chris

 

Nice one Ernie. I wish I knew this last year!

 

very good write up thanks

 

... did you guys run into any clearance issues when putting the cover back on? Mine didn't fit quite right and it would appear that the something shorted I am going to pull out and check, may need to buy another set of parts!

 

Battery Light came on this evening... had to limp home on battery only... didn't quite make it, so a friend helped me with his jumper cables... I know...not the best thing to do, but had to be done...

I searched and found this thread, and will remove the alternator tomorow, replace the belt, regulator, etc., etc., I've had somewhat of a charging problem from day one, and have the whole weekend (ours is Friday and Saturday) to change it out.

Just wanted to say THANK YOU! to Ernie...it's posts like this that make this one of the best resources available.

You ROCK!

Mike "under the car tomorrow" in Kuwait

 

Excellent to hear Mike.

 

Another thanks to Ernie for this excellent post!

Just rebuilt my 355 alternator to be safe while the engine is out. Went to the local auto electronics shop and their expert said no need to replace the rectifier, it looked brand new (and when they are going bad you can tell visually?). They just glass bead cleaned it, looks like new now. Sounds good to me, so I just put in a new regulator (USI). Today brought it back for bench testing, ran perfect, 14-15 volts, 125 amps.

Thanks!

 

Fantastic thread Ernie! Truly informative!!!
Anyway just got back tonite from an alternator failure on my F40, two weeks after the service shop took it out and said that the alternator was fine-so they just changed battery!. Anyway light went on permanently and then only had a couple of miles to drive before it concked out on me. AA man put sided his batttery pack onto my battery and limped home.
Does anyone know if the F40 alternator is similar to 348/355?
Will definitely need a rebuild now!

 

Thanks Ernie, I just hope that when they take out the alt again(like they did a couple of weeks ago!) and test it, it wont be showing normal voltage again. Anyway I'll tell them to run it for half an hour and then hopefully it will drop the voltage and show them the way! BTW I thought I was hearing a whine from the engine bay in the direction of the alternator just before it went on me last night, is that more indicative of the alternator or belt? Any suggestions?

 

+1.

Could be alternator bearings mate. Could have been a belt noise, but they normally squeal/screech.

 

Well it's going off to the specialist tomorrow(not a Ferrari dealer) who hopefully can rebuild for me as I dont have both the time or expertise I'm afraid. However as a result of this thread I am much wiser and therefore they can't pull the wool over my eyes anymore(I hope!). thanks guys

 

I am new to F355 (4 weeks - first three in shop for 30K). After 48 miles battery light came on -based upon all the information I isolated it to alternator, orde3red replacement parts and this moring re-built - It worked! Thanks

 

Good to hear mate.

Congrats on the 355 purchase. Enjoy it in good health.

 

when I start my 308 up in the day the battery light comes on and I hear a squell and then it stops and then I tap the gas pedal and the light goes out,could that be a belt problem?

 

$$ Right on the money $$

You need to adjust that alternator belt Mike.

 

could that be too tight or too loose? either way I need to get my hands down there and fix it !!!!!!!!!!! thanks

 

Too loose.