Help!!! Loud Squeal, alternator locked.... 1985 300D - Page 3 - PeachParts Mercedes-Benz Forum

tobybul · #31 07-29-2008, 09:28 AM

Quote:

Originally Posted by vstech

my 79 TD has the 80 amp alt in it, and it just plugged right in...

Glad you said that. I postponed ordering from the local store and checked eBay. Here's what found. Is this the same place you got yours from? Did the electrical connection plug right in?

Removed bad link..

pawoSD · #32 07-29-2008, 12:02 PM

Quote:

Originally Posted by tobybul

Actually, I will be ordering the Alt by 9am today. I guess I was not aware that there are other alternator options. But I'm with Pawo, I really don't want to fiddle with changing the connectors. So, if there is a larger capacity alternator that would fit without modifications, I am very open to suggestions.

Pawo, what did you mean by 115 or 120?

I was talking about the AL129x high output 120A alternator....I meant that it would be worth it to swap connectors/cables for one that powerful, but not for only an extra 10-15A....

That 80A with the proper plug on ebay looks like a good buy if it was properly rebuilt.....my last one was not, lasted barely a year....rotor had huge play in it and thus the voltage regulator took a beating. 20% brushes left after only a year!

The resistor in the voltage regulator fell off when I took it out too....

After seeing so many less than great rebuilds I am partial to the Genuine Bosch-Germany rebuilds...they seem to be the only ones that hold up like they should.......even though they are $65 more usually....

tobybul · #33 07-29-2008, 12:10 PM

Pawo, am I to understand that the one you put in was an 80a and was from eBay?

I did call that Fella on eBay and he said he remans the alts right there in CA. Sounds like he owns the repair business. So, now what to do, what to do.....

pawoSD · #34 07-29-2008, 12:14 PM

No I used a 65A from Murrays Auto Parts (same as advance autoparts) they are in Lansing. It was "rebuilt in Malaysia"....which made me suspicious right away....and sure enough it lasted a year. Oh well.

vstech · #35 07-29-2008, 12:44 PM

Quote:

Originally Posted by tobybul

Glad you said that. I postponed ordering from the local store and checked eBay. Here's what found. Is this the same place you got yours from? Did the electrical connection plug right in?

http://cgi.ebay.com/ebaymotors/MERCEDES-BOSCH-ALTERNATOR-DIESIL-240D-300D-450SL1977-85_W0QQcmdZViewItemQQ_trksidZp1713Q2em153Q2el1262QQcategoryZ33573QQihZ003QQitemZ130236950131

that guy don't know how to spell Diesel...
the 80 amp in my 79 came to me installed... I have pulled it and played with it, but it was in there when I bought the car.

LUVMBDiesels · #36 07-29-2008, 01:01 PM

There are five AL129X alternators on ebay right now...

http://motors.shop.ebay.com/Parts-Accessories_Car-Truck-Parts-Accessories__Alternator-AL129X_W0QQ_nkwZAlternatorQ20AL129XQQ_fxdZ1

pawoSD · #37 07-29-2008, 01:04 PM

My question about the AL129x alternators is do they have very good overall output at the low RPM's of a diesel? I mean, most of my driving is done between 1300-3400rpm...with the majority at 2000rpm or less. Are they still suitable? What rpm do they produce their max output?

vstech · #38 07-29-2008, 01:15 PM

tons of reading on this site about the 120A upgrade. mostly about how the 500RPM idle output is still in the 14V range. and healthy 60 or so output. WAAAAAAY better than the 55 amp max from the stock alt.

pawoSD · #39 07-29-2008, 01:28 PM

Quote:

Originally Posted by vstech

tons of reading on this site about the 120A upgrade. mostly about how the 500RPM idle output is still in the 14V range. and healthy 60 or so output. WAAAAAAY better than the 55 amp max from the stock alt.

Awesome....thats all I needed to know.

tobybul · #40 08-09-2008, 08:49 AM

Quote:

Originally Posted by vstech

two things... first, you know that the bolts on the front of the alternator do not turn right?
bolts turn and come out the back of the alternator.
second, if it were me, I would order a gasser's 80 amp alternator... too late, I know, but still... others read back threads...
I'm just saying...

Back in the groove again after a week's vacation. Car sat in the garage in the meantime. Soaked it with liquid wrench b4 I left so we'll see what that did. Even if it was the bearing that went bad and can be replaced, I don't think I want to reuse the old alt just because of its age

I have not ordered the alternator yet. I am still wondering if anyone in the forum has really ordered the 80a from eBay and how long it has lasted. I am a bit heistant to get eBay stuff as I'm leary aboutthe quality.

vstech, do you think your 80a came from eBay? How come you pulled it out just to play with it? Seems like a lot of work.

I ordered 2 thru bolts from the dealer yesterday just in case ($4 ea

).

tobybul · #41 08-09-2008, 08:45 PM

Still working on removing thru bolt. At least it budged and I believe I have all the threaded part off now. Except that the 80% of the bolt is still in and tight but at least it turns. I looked at the part of the bolt that eased out and I do not see any rust on the bolt.

SO far, slow but sure.

Would still be interested in knowing who among the members have bought the 80a alternator.

Here is a parts picture that I found in the forum of the alternator.

Update:

Finally got the old alt out. One trick I used was to screw another long, fully threaded bold on the opposite end to push the thru bolt out. That was slick!

I noticed thatt he old alt is actually a reman. Now I am wondering how old this reman really is. I pulled the tag off and am wondering if there is a way to tell from the numbers on the tag. Of course theres no date. That would be too easy.

tobybul · #42 08-14-2008, 06:59 PM

Update:

Finally got the old alt out. One trick I used was to screw another long, fully threaded bold on the opposite end to push the thru bolt out. That was slick!

I noticed that the old alt is actually a Bosch reman. Now I am wondering how old this reman is. I pulled the tag off and am wondering if there is a way to tell from the numbers on the tag. Of course theres no date. That would be too easy.

pawoSD · #43 08-14-2008, 09:51 PM

Quote:

Originally Posted by tobybul

Update:

Finally got the old alt out. One trick I used was to screw another long, fully threaded bold on the opposite end to push the thru bolt out. That was slick!

I noticed that the old alt is actually a Bosch reman. Now I am wondering how old this reman is. I pulled the tag off and am wondering if there is a way to tell from the numbers on the tag. Of course theres no date. That would be too easy.

Every alt I've ever replaced on our cars (we've replaced all of them at this point) have been re-man's too....there's no way to tell how old they are unless someone wrote the date on it, and no one does that....so its just a guess. My car had a "world class" re manufactured unit on it, and I used it for 4 years....and it looked older when I got the car, so it was probably several years old. A good re-man should last 100k or more.....

barry123400 · #44 03-14-2010, 04:13 PM

Quote:

Originally Posted by tobybul

Back in the groove again after a week's vacation. Car sat in the garage in the meantime. Soaked it with liquid wrench b4 I left so we'll see what that did. Even if it was the bearing that went bad and can be replaced, I don't think I want to reuse the old alt just because of its age

I have not ordered the alternator yet. I am still wondering if anyone in the forum has really ordered the 80a from eBay and how long it has lasted. I am a bit heistant to get eBay stuff as I'm leary aboutthe quality.

vstech, do you think your 80a came from eBay? How come you pulled it out just to play with it? Seems like a lot of work.

I ordered 2 thru bolts from the dealer yesterday just in case ($4 ea

).

Look at the california guys feedback. There seem to be about two possibly excellent rebuilders in that state selling on ebay.

If there is an issue with their products you will see it on their feedback. Pretty high feedback numbers on their sites if I remember.

Believe me a guy shipping poor alternator or starters especially is going to get negative feedback. At least his rebuilts are done in house and not mexican or poor quality third world asian countries rebuild products. No core return either if I remember required.

Diesel911 · #45 03-14-2010, 06:31 PM

Quote:

Originally Posted by barry123400

Why not take the alternator apart. Remove the bearings. Take them to a bearing supply place or altenator shop and get replacements. All that has happened is a bearing has failed in there. Very common. If unable to remove the bearings an alternator shop can do it for very little once you have the alternator apart.

You fellows are aware the slip ring can be replaced on these alternators as well. They see so many miles they sometimes have very deep grooves worn in them.

Actually this is a very cheap part. The problem comes after you install the new one. It has to be trued up on a lathe. I have been toying with the ideal of doing a general reconditioning on all my older alternators that are showing wear. Some may still be the original units for all I know. As is stated a lot comprehensive records with an old car are important.

Barry could you post the source of the Slip Ring. I used to have it in my notes but they got deleted accidently.