Alternator for MEP802

[DieselAddict]

What is a reasonable source for an alternator for a MEP802?

 

[zarathustra]

ebay has them once in a while. There was one for sale for ~225 on it a few weeks ago, and it was re-listed, so it might still be on that site.

BUT, if you buy that one or any other alternator without a pulley, you will still be stuck with the task of finding a pulley. That could be much harder than finding the alternator.

If it was me, I'd be trying to get a complete used alternator. Even if it needed repair it might be easier to deal with that than trying to get new. The regulators on those alternators come off easily and are fairly easy to get and they're cheap.

good luck

z

 

[DieselAddict]

Thanks. I have the alternator its just bad. The rectifier assembly is bad and the stator is rubbing. I figured it would be cheaper to replace than rebuild. I was looking at single wire alternators but I've not found dimensions to be confident in a substitution.

Edit - Sorry for the typos. Phone keyboards are a bit small for my fingers.

 

[DieselAddict]

Ouch. $200 for an alternator. I think I'll repair this one. It looks like all I need are the rectifiers.

 

[DieselAddict]

All the diodes on the negative ring are OK. One of the diodes on the positive ring is OK. It looks like there was an assembly error with two of the diodes on the positive ring being installed upside down.

The triode assembly checked ok too.

The stator tests OK on continuity as well.

Now to find some diodes.

 

[DieselAddict]

Well, the positive rectifier ring is $14. Not too bad.

 

[DieselAddict]

If anyone wants to rebuild their own alternator here are the part numbers and prices I was quoted for the rectifier parts:

Positive Rectifier - 0180000G98S $13.76

Negative Rectifier - 0180000F83S $5.83

Diode TRIO Assembly - 0144300F16S $5.60

It will take some soldering to install these parts.

I'm hoping the regulator is OK.

 

[DieselAddict]

The rectifier ring arrived today. After soldering it in and putting the alternator back together it charges.

Dont be afraid to replace some parts instead of buying a whole alternator. Or send it to me to fix.

Oh, the positive ring includes the diode trio as I found out today when I opened the box.

 

[dstang97]

I know this is an old thread but I'm having a issue with my alternator. I need to verify its the correct one, bit my problem seems to be that someone was in there before me. The studs the wires attach to need to be 180* the block on the back of the alternator is hitting the studs for the starter. I have never messed with an alternator before but does it seem like it would be ok if I turned it 180*

 

[DieselAddict]

You can take it apart and rotate the two halfs so the rear lines up better. Been there done that on one I was working on.

Take me your time and you'll see it's not bad to work on.

 

[dstang97]

Ok cool I wasn't sure. So genius decided to put rtv on the studs to create an isolator. I knew something was not right. Can you also do me a favor and measure the spacer on the lower bolt. Mine is 1/2 inch or so. I have a very molested unit and trying to work out the kinks

 

[DieselAddict]

I don't have access to it at the moment.

See if if this helps - http://www.prestolite.com/literature/tech/alts/TSB-3021_8MR_Hardware.pdf

 

[Guyfang]

The first time I saw an alternator installed like that, I just sat down and died. How could anyone install it, and not see that it's just simply, wrong. Then a CECOM guy told me that indeed, there is some obscure piece of equipment in the army, that needs that alternator, in that configuration. BUT, it has another NSN. And at times, supply clerks, in their "uninformed state", (I loved it when he used such nice phrases to indicate stupidity) thought, an alternator, is an alternator, looks the same, must be the same. Then gave it to an "Uninformed" mechanic to install.

 

[Guyfang]

Wait a minute. Look at figure 4, sheet 2 0f 2, and tell me which item number you want to know about. I may have a way to tell you what size it is.

 

[dstang97]

Dissected the alternator this morning. I'm not sure why I was scared to do it. Very simple job. I took pictures of it before assembly just in case. Got it spun around and all back together. Thanks guys

 

[DieselAddict]

Great job! Congrats.