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Topic: ML430 replace serpentine belt tensioner pulley? Reply to Thread
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  Topic Review (Newest First)
07-01-2019 08:22 AM
Noodles I have done quite a few using what Witek and 43 posted. It works exceedingly well.
07-01-2019 04:39 AM
43sqd This is what Witek is referring to.
07-01-2019 04:12 AM
Witek_M
Quote:
Originally Posted by nivekau View Post
Well I bought a new belt tensioner (with pulley), new serpentine belt and a new idler pulley from Pelican Parts, sent by Fedex to Australia.

I fitted the tensioner and belt yesterday. Unfortunately I couldn't get the idler pulley bolt out, because the cooling fan was in the way and I didn't have a 36mm spanner to remove it. However, the belt went on so easily (fitted to the water pump pulley last), compared to my experience the week before with the locally bought tensioner pulley which was 1mm diameter oversize.
Fan blades have uneven spacing to prevent harmonics. One space is just wide enough to get that long bolt out.
07-01-2019 12:01 AM
nivekau
Quote:
Originally Posted by 260e crusier View Post
Did you check the idler pulley by spinning and pulling on it?
Yes, it's seems to be in good shape, but at some stage I will get the required spanner to remove the fan and change the pulley.
06-30-2019 10:27 PM
260e crusier
Quote:
Originally Posted by nivekau View Post
Well I bought a new belt tensioner (with pulley), new serpentine belt and a new idler pulley from Pelican Parts, sent by Fedex to Australia.

I fitted the tensioner and belt yesterday. Unfortunately I couldn't get the idler pulley bolt out, because the cooling fan was in the way and I didn't have a 36mm spanner to remove it. However, the belt went on so easily (fitted to the water pump pulley last), compared to my experience the week before with the locally bought tensioner pulley which was 1mm diameter oversize.
Did you check the idler pulley by spinning and pulling on it? If it's not making any unusual noise, you will probably be fine. If it's free wheel easily, the bearing is getting dry.

I like to change mine out about every 60K to 80K miles as a preventative measure. It's only a $5 part here in the US.
06-30-2019 08:48 PM
nivekau Well I bought a new belt tensioner (with pulley), new serpentine belt and a new idler pulley from Pelican Parts, sent by Fedex to Australia.

I fitted the tensioner and belt yesterday. Unfortunately I couldn't get the idler pulley bolt out, because the cooling fan was in the way and I didn't have a 36mm spanner to remove it. However, the belt went on so easily (fitted to the water pump pulley last), compared to my experience the week before with the locally bought tensioner pulley which was 1mm diameter oversize.
06-21-2019 06:45 PM
nivekau
Quote:
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!
06-21-2019 09:14 AM
260e crusier
Quote:
Originally Posted by nivekau View Post

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
06-20-2019 11:38 PM
nivekau
Quote:
Originally Posted by Carl Burr View Post
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.
06-20-2019 06:15 PM
Carl Burr 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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