ML430 replace serpentine belt tensioner pulley? - Page 2 - Mercedes-Benz Forum
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post #11 of 26 (permalink) Old 06-19-2019, 08:31 PM Thread Starter
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Originally Posted by 260e crusier View Post
$68.22 at one of my "go to" place.....
In Australia it's AUD339 (US$233)

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Originally Posted by Witek_M View Post
You need to compress tensioner by turning it counter clockwise and arresting it in place with 4 mm pin. Route the belt around all pulleys leaving water pump pulley as last.
I've done that. In fact I found I could get a little bit more movement out of the tensioner past the hole for the pin, so I did that and wedged a piece of wood against the wrench handle to keep it in that position. I was however trying to get it on the idler pulley last (above the water pump). The idler pulley does have quite a lip on it, so I'll try it again but do the water pump last.

I suspect the problem is that the new tensioner pulley is very slightly bigger than the original - it's 96mm diameter whereas the old one is 95mm. That adds 3.14 mm to the circumference of the pulley. The belt only goes around half of it so that's an extra 1.57mm +0.5mm for the extra radius. That 2.07mm might be just enough to stop me getting the belt on.

Trouble is, when I search for the part online it says it is the right part - we don't have much choice of parts down here in Australia

Update: Just checked with my local dealership - they have one in stock and it's $75. I paid $60 for the Nuline one that isn't quite right!
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Last edited by nivekau; 06-19-2019 at 11:51 PM.
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post #12 of 26 (permalink) Old 06-20-2019, 04:44 AM
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Originally Posted by 260e crusier View Post
$68.22 at one of my "go to" place.....



https://www.rmeuropean.com/Make/Part...rch=1122000970
Great prices amd there going in my list of sites to shop on, however for me 2 day shipping makes Amazon a better deal.

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post #13 of 26 (permalink) Old 06-20-2019, 08:14 AM
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Great prices and they're going on my list of sites to shop on, however for me 2 day shipping makes Amazon a better deal.

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Sorry for hijacking this thread

I guess it depends on where you live and how urgent you need the part.

I live in California and don't have Amazon Prime. For me, RM European is a better deal. If I place my order before 12:00 noon, 99% of the times it will be at my doorstep the next morning.
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Last edited by 260e crusier; 06-20-2019 at 08:17 AM.
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post #14 of 26 (permalink) Old 06-20-2019, 08:20 AM
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I guess it depends on where you live and how urgent you need the part.
You got brotaoe chip!

OEM is always preferred, sometimes the price isn't, but worth the wait for me on certain parts, but not all. If I really need it, Oreillys local store can usually get it to me overnight, sometimes same day if early enough.

Thanks though for another Benz place to compare prices to! There can never be to many of those to keep our aging ladies in good shape!

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post #15 of 26 (permalink) Old 06-20-2019, 10:34 AM
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RM Euro ships from multiple warehouses some of which are on the East Coast.

I usually have same experience as 260 cruiser, other than one instance where a part came from a NorCal distributor which is where I assume his parts ship from.
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post #16 of 26 (permalink) Old 06-20-2019, 06:00 PM Thread Starter
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Well the Benz dealership just wasted an hour of my life. I went to pick up the pulley they had set aside for me, but it was an idler pulley - in an opened bag that said "belt tensioner" on it. Turns out they don't sell the pulley on its own, you have to buy the whole tensioner unit, which costs AUD$ 680! But hey, I suppose they have to pay the wages of the six guys in the spares dept sitting around doing nothing.

So I'm back to my slightly oversize aftermarket pulley. I figure if I can find a way to get the belt on with that pulley the tensioner should be able to cope with the extra 2mm it introduces to the belt path.

Thanks for all the suggestions re sources for these parts, however I live in Australia, not the USA, and it takes at best about 5 days to get a part here from the US, unless I can use someone like DHL which would add $100 to the freight charge.
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post #17 of 26 (permalink) Old 06-20-2019, 06:15 PM
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Have you tried same a chain and sprocket over the idler pulley...get it started a bit and then turn the pulley?

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post #18 of 26 (permalink) Old 06-20-2019, 11:38 PM Thread Starter
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Have you tried same a chain and sprocket over the idler pulley...get it started a bit and then turn the pulley?
Not quite sure what you mean Carl.

I have however got the belt back on! I installed the belt so that the last pulley it needed to go onto was the water pump, then I put a steel hook under the belt which was attached to a length of chain with another hook on the other end through which I put a steel bar and I levered the belt up onto the pulley.

The car runs okay but I'm not happy with the set up because the belt tensioner is so far off where it normally is I was able to remove the locking pin without needing the move the tensioner.

I'm going to order a new tensioner, with pulley and a new belt from the US.

Last edited by nivekau; 06-21-2019 at 01:31 AM. Reason: fixed typo
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post #19 of 26 (permalink) Old 06-21-2019, 09:14 AM
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The car runs okay but I'm not happy with the set up because the belt tensioner is so far off where it normally is I was able to remove the locking pin without needing the move the tensioner.
Try not to drive the car too much in that condition. You are probably putting addition stress/load on all the other pulleys/bearings.

Check your idler pulley. If it was me, I would just replace it, but then it's only a $4.83 OEM part here in the US

https://www.rmeuropean.com/Products/...G40-V3926.aspx

Last edited by 260e crusier; 06-21-2019 at 09:18 AM.
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post #20 of 26 (permalink) Old 06-21-2019, 06:45 PM Thread Starter
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Originally Posted by 260e crusier View Post
Try not to drive the car too much in that condition. You are probably putting addition stress/load on all the other pulleys/bearings.
That's a good point!

I'm going to order proper parts from the US right now!
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