ALTERNATOR REPLACEMENT w123 - PeachParts Mercedes-Benz Forum

Fattyman · #1 09-30-2010, 05:52 PM

Ah yes, these cars develop a personality of their own as time goes by. If the bolt that holds the adjusting bracket to the engine is too tight to turn by hand I leave the bracket attached to the motor. If it turns freely I remove it with the alternator. To make things more festive there are 2 types of brackets used with the later style tension bolt. One has a rectangular cutout and one does not. You cannot use the cutout style on the larger Bosch AL129X alternator as it will interfere with the heater hose outlet. You also have to turn in the tension nut so you can get the bracket back on the engine block. The AL129X alternator is physically larger and will hit the motor otherwise.

funola · #2 12-23-2010, 10:25 PM

Quote:

Originally Posted by Fattyman

Ah yes, these cars develop a personality of their own as time goes by. If the bolt that holds the adjusting bracket to the engine is too tight to turn by hand I leave the bracket attached to the motor. If it turns freely I remove it with the alternator. To make things more festive there are 2 types of brackets used with the later style tension bolt. One has a rectangular cutout and one does not. You cannot use the cutout style on the larger Bosch AL129X alternator as it will interfere with the heater hose outlet. You also have to turn in the tension nut so you can get the bracket back on the engine block. The AL129X alternator is physically larger and will hit the motor otherwise.

Do you have a pic of the bracket that works with the larger AL129X? I am about to put this alternator into my 83 300D turbo.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=170574879052&viewitem=&sspagename=STRK%3AMEWNX%3AIT

Will my 83 have a compatible bracket to the Ebay alternator?

Fattyman · #3 12-23-2010, 10:56 PM

That alternator will work but but it does not come with a pulley. They tell you you will have to use your pulley which being the stock size will make the install a little more festive. Meaning that you may have to thread your belts onto it first before you mount the bracket to the block. This depends on what belts you have. I run a smaller pulley which allows you to run the stock size belts. It also spins the alternator faster at idle so you get a full charge rate even while sitting in traffic with all your goodies turned on. If your bracket does not have a stamped out square opening it will work with that alternator. I'm sorry, I don't have a pic. You also want to make sure that the wire mounting studs are on the opposite side of the alternator mounting ears. That will put them on the passenger side of the car when the alternator is mounted and your wiring harness will be able to reach them no problem. If the studs are not in that position your harness may not reach and they also might be blocked by the AC hoses. The picture on the ebay ad does not look like the studs are mounted in the right spot. You can split the alternator and put them where you want but they may void your warranty.