seized bolt alternator bracket help - PeachParts Mercedes-Benz Forum

zeke · #1 04-03-2011, 07:12 PM

the lower bolt on my alt bracket will move about1/8 turn in either direction and that's it. working at it a bit only succeeded in rounding the corners off a but, so I thought I should stop and ask for some help.

I am trying to replace the alternator, but in doing so I noticed there was no bushing on the upper bolt and no nut either

so maybe my alternator is ok, but not generating voltage because its loose.

so now I am trying to remove the lower bolt to get a bushing back up top.

what do I do?

toomany MBZ · #2 04-03-2011, 07:22 PM

The lowest bolt threads into the bracket bolted to the engine. If it won't come all the way out, it's stripped.

Try and remove the bracket bolted to the engine, this is what I had to do to get mine out.

vstech · #3 04-03-2011, 08:06 PM

WHICH lower bolt? closest to the engine, or furthest from it?
are you trying to loosen it from the front of the alt, or the back? ALL BOLTS GET LOOSENED FROM THE BACK!

zeke · #4 04-03-2011, 08:22 PM

thanks, did you have to remove anything to get to the bolts on the engine?

its the one that forms the pin in the hinge...Its the one with the head right by the ac high pressure port

vstech · #5 04-03-2011, 08:27 PM

I use a 17mm 1/2" drive socket and ratchet. and LOTS of leverage. it helps to soak the other side with aerokroil too.

zeke · #6 04-03-2011, 08:33 PM

thanks vstech, I guess there is nothing to lose. I was using a box end. will try the ratchet and a bar

whunter · #7 04-03-2011, 10:48 PM

Does the alternator move free on the lower pivot bolt?

.

zeke · #8 04-04-2011, 01:19 AM

Quote:

Originally Posted by whunter

Does the alternator move free on the lower pivot bolt?

.

enough to wiggle a bit, but I haven't been able to get the belts loose enough to slip them off. I can adjust the top nut all the way out and loden them up, but not write enough to slip them off, so I think the hinge isn't really free. I'm not sure if that answers your question.

who carries aerokroil...I have pb blaster, is it better for the job?

tangofox007 · #9 04-04-2011, 09:24 AM

Quote:

Originally Posted by zeke

who carries aerokroil...?

Kroil isn't generally available for retail sale, but you can find it at Eastwood, Amazon, and Ebay. Or you can order it directly from Kano Labs if you give them a business name.

From the Kano Labs website:
ALL PRODUCTS PRODUCED AND DISTRIBUTED BY KANO LABS ARE FOR INDUSTRIAL USE ONLY AND ARE NOT INTENDED FOR RETAIL SALE, PERSONAL OR CONSUMER USE.

JHZR2 · #10 04-03-2011, 11:57 PM

aerokroil or liquid liquid wrench oil... a good amount of it,

JHZR2 · #11 04-04-2011, 01:21 AM

Ive used pblaster, and as far as aerosols go, it is probably the best... But the actual liquids in my experience work far better. More concentrated and more localized without the mess. Go to Home depot or any parts store and buy the bottle of liquid (not aerosol) liquid wrench. Works great. Apply to the specific interfaces of the seized parts you want to move.

Mark DiSilvestro · #12 04-04-2011, 03:29 AM

I went through this nightmare recently after the alernator died on my '84 TD. The bottom bolt was seized in the two-inch hole in the aluminum bracket. Afraid of snapping the bolt, I used assorted prybars and a 2x4 to move the alternator as needed. First I removed the top adjuster bracket. Then I pried the alternator out as far as I could to allow room for my socket to unbolt the alternator bracket from the engine. Then I removed the alternator, with bracket, so I could work on that bolt someplace more convenient, with a breaker-bar, electric impact-gun, and liberal doses of oil, until (two hours later!) it finally came out. During this ordeal, the bolt head did get a bit rounded, but there still was enough left to be able to tighten it with a six-point socket. Plus it's now well lubed, so that it should be OK for awhile.
You migh try soaking it with some type of penetrating-oil for a day or two before attempting what I went through. Good Luck.

Happy Motoring, Mark

Cr from Texas · #13 04-07-2011, 05:59 PM

Quote:

Originally Posted by Mark DiSilvestro

I went through this nightmare recently after the alernator died on my '84 TD. The bottom bolt was seized in the two-inch hole in the aluminum bracket. Afraid of snapping the bolt, I used assorted prybars and a 2x4 to move the alternator as needed. First I removed the top adjuster bracket. Then I pried the alternator out as far as I could to allow room for my socket to unbolt the alternator bracket from the engine. Then I removed the alternator, with bracket, so I could work on that bolt someplace more convenient, with a breaker-bar, electric impact-gun, and liberal doses of oil, until (two hours later!) it finally came out. During this ordeal, the bolt head did get a bit rounded, but there still was enough left to be able to tighten it with a six-point socket. Plus it's now well lubed, so that it should be OK for awhile.
You migh try soaking it with some type of penetrating-oil for a day or two before attempting what I went through. Good Luck.

Happy Motoring, Mark

My bottom pivot bolt broke during use. Didn't notice till I started to change belts. Holes in both the alternator and the bracket had become ovaled. I got a spare bracket and two spare alternators from PNP. The engine at PNP had the harmonic balancer off so getting the bracket was easy. There is a bolt in the front of the bracket that I thought would require removing the harmonic balancer to remove so I never changed mine. I used some shims and got the alternator square and a new belt in place. Car is now gone but I now have two spare alternators, the lower bracket, and an adjusting bracked available. Any offers?

Mark DiSilvestro · #14 04-07-2011, 08:42 PM

My TD is a Euro non-turbo. I had just enough room next to the balancer, to get a short 3/8 extension and 17 mm socket on the front bracket bolt.

I discovered the bottom alternator-bolt had snapped at the threads shortly after I acquired my first 240D. The alternator must have been rattling and knockng about for who-knows how long!
I was able to get all the bolt fragments out, and make a shim from some scrap steel to fill the oversize hole in the bottom of my alternator. Also had to use selected washers to shim between the alternator and bracket as gaps had opened there as well.

Happy Motoring, Mark

vstech · #15 04-04-2011, 09:30 AM

if you have a C.C. Dickson locally, it's on the shelf. also totaline parts carries it locally. nearly any HVAC supply shop should have it.
Johnstone supply etc... Trane service centers also.