ML430 replace serpentine belt tensioner pulley? - Mercedes-Benz Forum
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post #1 of 26 (permalink) Old 06-17-2019, 08:57 PM Thread Starter
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ML430 replace serpentine belt tensioner pulley?

Hi all,
The serpentine belt tensioner pulley bearing on my ML disintegrated last night while I was driving the car. Fortunately it happened at a set of traffic lights and I was able to pull over to the side of the road pretty much immediately.

Can I just replace the tensioner pulley or do I have to have to replace the whole tensioner unit?
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post #2 of 26 (permalink) Old 06-17-2019, 09:33 PM
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Are you asking.... bearing replacement in the tensioner pulley vs. tensioner unit replacement?

Correct me if I'm wrong, It seems like the Q you are asking is one in the same.
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post #3 of 26 (permalink) Old 06-17-2019, 09:46 PM Thread Starter
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What I meant was is it okay to just replace the tensioner pulley (which includes the bearing).

It appears that the pulley can be bought on its own, so I guess I don't have to change the whole tensioner unit :-)
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post #4 of 26 (permalink) Old 06-17-2019, 09:49 PM
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You can just replace the pulley and bearing assembly only if you want.

Personally, I would replaced the the whole tensioner, idler pulley and serpentine belt. It's a relatively cheap and easy DIY even with OEM parts.
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post #5 of 26 (permalink) Old 06-17-2019, 10:01 PM Thread Starter
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Originally Posted by 260e crusier View Post
Personally, I would replaced the the whole tensioner, idler pulley and serpentine belt. It's a relatively cheap and easy DIY even with OEM parts.
I will do, however to get the parts at a reasonable price I need to order them, and in the meantime I intend to do a quick roadside repair so I can get the car home. I could have got the parts today but they would cost more than double what I can buy them for online.
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post #6 of 26 (permalink) Old 06-17-2019, 11:16 PM
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Tensioner may very possibly fail in short order. Might not be problematic at the moment, but they don't like being disturbed. Have seen more than a few times an operable tensioner fail after pulling a serp belt.

Matter fact, just happened to me about a month ago. Belt was nice and tight, no squeaks. Decided to upgrade alternator while I was doing common oil seal leak repairs and when I reinstalled the damn thing was chirping and wobbling.
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post #7 of 26 (permalink) Old 06-19-2019, 12:28 PM
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Get the Gates version on Amazon. It is the Litens part in a Gates box for $76!

Sent from my VS988 using Tapatalk
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post #8 of 26 (permalink) Old 06-19-2019, 06:31 PM Thread Starter
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Originally Posted by Carl Burr View Post
Get the Gates version on Amazon. It is the Litens part in a Gates box for $76!
Carl, if I was in the US I would, but Amazon in Australia don't have it.

I managed to get a pulley late yesterday and had the car brought home. I have fitted the pulley (the tensioner *feels* fine at the moment), but I just can't get the belt back on! It's driving me crazy.
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post #9 of 26 (permalink) Old 06-19-2019, 06:53 PM
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Quote:
Originally Posted by nivekau View Post
Carl, if I was in the US I would, but Amazon in Australia don't have it.

I managed to get a pulley late yesterday and had the car brought home. I have fitted the pulley (the tensioner *feels* fine at the moment), but I just can't get the belt back on! It's driving me crazy.
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.
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post #10 of 26 (permalink) Old 06-19-2019, 07:47 PM
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Originally Posted by Carl Burr View Post
Get the Gates version on Amazon. It is the Litens part in a Gates box for $76!

Sent from my VS988 using Tapatalk
$68.22 at one of my "go to" place.....

https://www.rmeuropean.com/Make/Part...rch=1122000970
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