Assistance needed - replacing C32 alternator
#1
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Assistance needed - replacing C32 alternator
Alternator is dead, no doubt. Dealership quoted me $1500 parts & labor. I almost died. I fortunately found the $1100 alternator (valeo brand) for around $270 at www.autohausaz.com, and it's on the way. I'm guessing my car has an automatic belt tensioner, but I've never replaced an alternator before. I already removed the left air intake hose, and air pump, so I can get to the dead alternator. Searching this forum didn't yield and DIY installs for a C32 alternator. Any advice and pics would be greatly appreciated. Thanks!
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Haven't done it but I can remember reading that changes have been made to the serpentine belt idler pully so be sure to check if yours needs it. Let us know how it goes.
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2003 C-Class Sportcoupe
I think the C32 AMG uses a bosch alternator. Valeo alternators have a different pulley. You would probably need to remove the old 8 rib pulley and put it on the new alternator. Use a pulley puller.
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05 ML350, 85 300D
There is no pulley puller- these alternators don't usually come with pulleys. You remove the nut off the stator and the pulley falls off- the new alternator will come with a nut on it..no pulley. Other than that - biggest tip is to make sure the battery is disconnected and to push the bolt hole bushings back (outward), so you don't fight the new alternator into the bracket.
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Originally Posted by MBTech21
There is no pulley puller- these alternators don't usually come with pulleys. You remove the nut off the stator and the pulley falls off- the new alternator will come with a nut on it..no pulley. Other than that - biggest tip is to make sure the battery is disconnected and to push the bolt hole bushings back (outward), so you don't fight the new alternator into the bracket.
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IssaC63 (04-14-2020)
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05 ML350, 85 300D
Usually we would do it with an impact gun, with the alternator off- so you have to release the belt first-obviously.
I can't see any one charging more than 1-1 1/2 hrs for this job, so it might be better seeing if another shop gives you a better deal on installing your part.
I can't see any one charging more than 1-1 1/2 hrs for this job, so it might be better seeing if another shop gives you a better deal on installing your part.
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#8
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How do I loosen tensioner pulley
I think the pic below is the tensioner pulley. The part circled in green shows the bolt. A wrench goes over and around the larger "nut" part, but I have no clue what to use on the part that looks like a hex star bit. Any ideas?
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Originally Posted by mleskovar
Isn't it a reverse torx?
#11
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Here's a pic of what I'm talking about
Does the bolt the green arrow is pointing to pull straight out or is it threaded? It doesn't seem to be shaped for a socket to fit on it.
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MBTech21 wrote "...biggest tip is to make sure the battery is disconnected and to push the bolt hole bushings back (outward), so you don't fight the new alternator into the bracket"
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Originally Posted by mleskovar
MBTech21 wrote "...biggest tip is to make sure the battery is disconnected and to push the bolt hole bushings back (outward), so you don't fight the new alternator into the bracket"
![wwf](https://mbworld.org/forums/images/smilies/chairshot.gif)
Besides, I was having difficulty removing the OLD one, not installing the new one.
Last edited by FairfaxC32; 04-27-2006 at 10:46 PM.
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C32 DIY Alternator Replacement
Ok, finally got the alternator replaced and everything except the ESP is working fine (probably needs a reset somehow). For other newbies to alternator replacements, here are some basic guidelines with pics.
1. Remove engine cover, left air intake (black plastic stuff), air filter over battery, and the air pump (including mounting bracket).
2. Remove battery cables from battery.
3. Jack front of car up and put onto jack stands. Some access to the alternator will be needed from underneath the car.
4. Loosen serpentine belt. See tensioner pulley in Picture 1 below. Use a 15mm socket, and torque the pulley counterclockwise; as you do, the whole pulley will move to the left, reducing the tension on the belt. Do this far enough and you'll be able to slip the belt off the alternator. There is a bolt head to the right of the alternator that I secured the serpentine onto, so that the belt wouldn't come off all the other pullies.
5. Remove both wires connected to the back of the alternator.
6. Remove both bolts that secure the alternator to the engine. See Pic 2 below.
7. Use a pry bar to loosen/remove the alternator.
8. Remove the old alternator - this can take some patience, as the space is very cramped.
9. See Pic 3. Inside the bracket there is a bushing which you should tap out (away from the alternator) a little so when you put the new alternator in there's a little room. Do this on the bottom bracket as well.
10. Install new alternator, connect both wires, secure with original bolts.
11. Reinstall battery cables
12. Reinstall stuff in step 1.
1. Remove engine cover, left air intake (black plastic stuff), air filter over battery, and the air pump (including mounting bracket).
2. Remove battery cables from battery.
3. Jack front of car up and put onto jack stands. Some access to the alternator will be needed from underneath the car.
4. Loosen serpentine belt. See tensioner pulley in Picture 1 below. Use a 15mm socket, and torque the pulley counterclockwise; as you do, the whole pulley will move to the left, reducing the tension on the belt. Do this far enough and you'll be able to slip the belt off the alternator. There is a bolt head to the right of the alternator that I secured the serpentine onto, so that the belt wouldn't come off all the other pullies.
5. Remove both wires connected to the back of the alternator.
6. Remove both bolts that secure the alternator to the engine. See Pic 2 below.
7. Use a pry bar to loosen/remove the alternator.
8. Remove the old alternator - this can take some patience, as the space is very cramped.
9. See Pic 3. Inside the bracket there is a bushing which you should tap out (away from the alternator) a little so when you put the new alternator in there's a little room. Do this on the bottom bracket as well.
10. Install new alternator, connect both wires, secure with original bolts.
11. Reinstall battery cables
12. Reinstall stuff in step 1.
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biker349 (02-22-2021)
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Congratulations and thanks for the write up. I believe ESP is reset by turning the wheels lock to lock. There's a sticky on the W203 forum for faults that occur after battery is disconnected and reconnected.
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biker349 (02-22-2021)
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05 ML350, 85 300D
Sorry, was off the board for a few days, but I see you got it done.
Good writeup- the only thing I would change is when loosening the belt tensioner, you should use a inverted torx on the tensioner- the 15 mm actually holds the pulley on and it is possible that you could loosen the nut rather than slacken the tensioner.
Good writeup- the only thing I would change is when loosening the belt tensioner, you should use a inverted torx on the tensioner- the 15 mm actually holds the pulley on and it is possible that you could loosen the nut rather than slacken the tensioner.
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How is the belt tightened? After 100K miles my serpentine belt still looks great, no cracks or fraying anywhere, but I'm starting to get anxious. How long do they usually last?
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Originally Posted by mleskovar
How is the belt tightened? After 100K miles my serpentine belt still looks great, no cracks or fraying anywhere, but I'm starting to get anxious. How long do they usually last?
#21
Hi Fairfax
This is probably 4 of the very best posts on the whole of the internet!
I'm about to do mine and would like to know if I need to remove the pipe-work above to gain access and if I do is there any fluids that will drain out?
Also.... where can I purchase a re-con unit from or do you guys recommend new?
regards
james
This is probably 4 of the very best posts on the whole of the internet!
I'm about to do mine and would like to know if I need to remove the pipe-work above to gain access and if I do is there any fluids that will drain out?
Also.... where can I purchase a re-con unit from or do you guys recommend new?
regards
james
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http://www.startekinfo.com/StarTek/o...tedDocId=11498
#23
How do you know if you haven't compared it to official Mercedes procedures?
![Roll Eyes (Sarcastic)](https://mbworld.org/forums/images/smilies/rolleyes.gif)
Anyways, thanks for the link BUT I'm based in London and need this thing sorted ASAP . I'm quite into DIY which is why I like the info posted by fellow Merc-idians.
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biker349 (02-22-2021)