DIY: M271 Idler & tensioner pulley
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
Likes: 9
From: Bangkok, Thailand
W124, W203, W204, W251
DIY: M271 Idler & tensioner pulley
Tools:
T-50 torx
T-60 torx
E-12 socket
Flathead screwdriver
Flex head
Short extension
1/2" ratchet
3/8" ratchet
Parts:
271 200 05 70 (Tensioner Pulley)
271 206 00 19 (Idler Pulley)
I've seen a few DIYs on this topic before, but none of them has pictures in it. So, here it is! BTW, I used file names as steps...enjoy at your own risk!
T-50 torx
T-60 torx
E-12 socket
Flathead screwdriver
Flex head
Short extension
1/2" ratchet
3/8" ratchet
Parts:
271 200 05 70 (Tensioner Pulley)
271 206 00 19 (Idler Pulley)
I've seen a few DIYs on this topic before, but none of them has pictures in it. So, here it is! BTW, I used file names as steps...enjoy at your own risk!
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c230
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Joined: Sep 2010
Posts: 1,434
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
Great DYI!
A couple of questions:
1. I'm assuming the tensioner keeps the belt tension at the proper level by itself and there's no adjusting or measuring the belt tension, right?
2. When you used the "T50 tamper proof torx", are you speaking of the ones with the little hole in the end for a post in the female part to go into (and not a regular torx bit)? Where did you get yours?
Thanks!
A couple of questions:
1. I'm assuming the tensioner keeps the belt tension at the proper level by itself and there's no adjusting or measuring the belt tension, right?
2. When you used the "T50 tamper proof torx", are you speaking of the ones with the little hole in the end for a post in the female part to go into (and not a regular torx bit)? Where did you get yours?
Thanks!
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
Likes: 9
From: Bangkok, Thailand
W124, W203, W204, W251
Great DYI!
A couple of questions:
1. I'm assuming the tensioner keeps the belt tension at the proper level by itself and there's no adjusting or measuring the belt tension, right?
2. When you used the "T50 tamper proof torx", are you speaking of the ones with the little hole in the end for a post in the female part to go into (and not a regular torx bit)? Where did you get yours?
Thanks!
A couple of questions:
1. I'm assuming the tensioner keeps the belt tension at the proper level by itself and there's no adjusting or measuring the belt tension, right?
2. When you used the "T50 tamper proof torx", are you speaking of the ones with the little hole in the end for a post in the female part to go into (and not a regular torx bit)? Where did you get yours?
Thanks!
2. Correct...one with hole, not the regular one. I got mine from ebay>>> http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT
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MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,434
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
1. Yes! There is no adjusting...the spring inside tensioner keeps the belt at proper tension.
2. Correct...one with hole, not the regular one. I got mine from ebay>>> http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT
2. Correct...one with hole, not the regular one. I got mine from ebay>>> http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT
I assume the tamper proof torx bit is 6 pt. It never bothered me till I started investigating the tamper proof bits and they come in 5 and 6 pt. My other torx bits are 6 pt. so my assumption is the tamper proof ones are 6 pt, too, but I'd just like to make sure.
Last edited by ncmudbug; Jul 25, 2011 at 10:38 PM.
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
2. Correct...one with hole, not the regular one. I got mine from ebay>>> http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
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From: Bangkok, Thailand
W124, W203, W204, W251
Member
Joined: Nov 2010
Posts: 129
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From: Ottawa, Ontario
Mercedes C230 2005
Do you get any noises when you put your AC on? If you start it when your stopped in drive, reverse or stopped at a light... I get this horrible sound coming. I'm thinking of doing this as well for my car and hopefully get rid of what feels like a sluggish start.. My rpms idle at 300 rpm... I've also had the alternator replaced the 1st week I picked it up (January 2010). It starts well, runs good for the most part.. Just I also hear a sound around the belts.
Can the pulley on altnernator just be replaced? Maybe that could be a possibility. Sorry for the bombarding in questions. I'm cleaning the TB this weekend to hopefully do it some good.
Member
Joined: Nov 2008
Posts: 142
Likes: 6
From: New Orleans, LA
C230K Sedan
Pick up a special slim serpentine belt tensioer tool from autozone really helps. 34 bucks. It small thin design fits in the tight spots so you don't have to remove the piping from the supercharger. Makes the job a lot quicker and easier. Just you got to squeeze the belt through a tight fit. Other wise you have to take the downpipe off so it gives you more room. Its just a few bolts and its off.
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Joined: Sep 2010
Posts: 1,434
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From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
I'm assuming from your answer that it is the 6 point we need. All the other internal wrenching torx fasteners I've seen on my car have been 6 point.
Member
Joined: Nov 2008
Posts: 142
Likes: 6
From: New Orleans, LA
C230K Sedan
Hey i'm just curious...
Do you get any noises when you put your AC on? If you start it when your stopped in drive, reverse or stopped at a light... I get this horrible sound coming. I'm thinking of doing this as well for my car and hopefully get rid of what feels like a sluggish start.. My rpms idle at 300 rpm... I've also had the alternator replaced the 1st week I picked it up (January 2010). It starts well, runs good for the most part.. Just I also hear a sound around the belts.
Can the pulley on altnernator just be replaced? Maybe that could be a possibility. Sorry for the bombarding in questions. I'm cleaning the TB this weekend to hopefully do it some good.
Do you get any noises when you put your AC on? If you start it when your stopped in drive, reverse or stopped at a light... I get this horrible sound coming. I'm thinking of doing this as well for my car and hopefully get rid of what feels like a sluggish start.. My rpms idle at 300 rpm... I've also had the alternator replaced the 1st week I picked it up (January 2010). It starts well, runs good for the most part.. Just I also hear a sound around the belts.
Can the pulley on altnernator just be replaced? Maybe that could be a possibility. Sorry for the bombarding in questions. I'm cleaning the TB this weekend to hopefully do it some good.
Your belt tensioner pulley is weak! Time to replace. It does a loud chirping noise ? Mine had the same problem. While your at it, go ahead and change out your idle pulley too.
Member
Joined: Nov 2008
Posts: 142
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From: New Orleans, LA
C230K Sedan
This is the bolt you have to get to. To replace the whole belt tensioner pulley unit.
The springs in these things gets weak. So you have to take half your engine off to even get to this one single bolt.
Thats German Engineering for ya baby!
GOOD LUCK!
Member
Joined: Nov 2010
Posts: 129
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From: Ottawa, Ontario
Mercedes C230 2005
so you replaced the whole tensioner and pulley? I heard you could get through it without have to remove the s/c
Yeah like it runs fine.. just i know something is wrong and whent he AC is on.. forget it... sounds like sh** metal grinding... not pleasent..
What is your rpm's at on idle in P
Yeah like it runs fine.. just i know something is wrong and whent he AC is on.. forget it... sounds like sh** metal grinding... not pleasent..
What is your rpm's at on idle in P
Member
Joined: Nov 2010
Posts: 129
Likes: 0
From: Ottawa, Ontario
Mercedes C230 2005
Can you just replace the pulley ont he Alternator though? I dont' wanna replace it again... I'm no car mechaninc, but with all the pictures.. shouldn't be too hard. I'm going to order the kit he has posted on Ebay as well.
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
Likes: 9
From: Bangkok, Thailand
W124, W203, W204, W251
Hey i'm just curious...
Do you get any noises when you put your AC on? If you start it when your stopped in drive, reverse or stopped at a light... I get this horrible sound coming. I'm thinking of doing this as well for my car and hopefully get rid of what feels like a sluggish start.. My rpms idle at 300 rpm... I've also had the alternator replaced the 1st week I picked it up (January 2010). It starts well, runs good for the most part.. Just I also hear a sound around the belts.
Can the pulley on altnernator just be replaced? Maybe that could be a possibility. Sorry for the bombarding in questions. I'm cleaning the TB this weekend to hopefully do it some good.
Do you get any noises when you put your AC on? If you start it when your stopped in drive, reverse or stopped at a light... I get this horrible sound coming. I'm thinking of doing this as well for my car and hopefully get rid of what feels like a sluggish start.. My rpms idle at 300 rpm... I've also had the alternator replaced the 1st week I picked it up (January 2010). It starts well, runs good for the most part.. Just I also hear a sound around the belts.
Can the pulley on altnernator just be replaced? Maybe that could be a possibility. Sorry for the bombarding in questions. I'm cleaning the TB this weekend to hopefully do it some good.
300 rpm is way too low for idle...you might have a vacuum leak somewhere. I think you should check the notorious $15 PCV hose for a leak when you clean your TB.
And yes...you can buy alternator pulley seperately.
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
Likes: 9
From: Bangkok, Thailand
W124, W203, W204, W251
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 331
Likes: 9
From: Bangkok, Thailand
W124, W203, W204, W251
It turns out there are two configurations for tamper proof torx (and I imagine plain torx): They come in a 6 pointed star and a 5 pointed start. I was looking around at tamper proof torx sets and I saw both. One place (I can't find it right now) said the 5 point was for Audi, BMW, and Mercs. Here's an example of the 5 pt. variety:http://cgi.ebay.com/ebaymotors/ws/eB...d=250858296654
I'm assuming from your answer that it is the 6 point we need. All the other internal wrenching torx fasteners I've seen on my car have been 6 point.
I'm assuming from your answer that it is the 6 point we need. All the other internal wrenching torx fasteners I've seen on my car have been 6 point.
