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04 odyssey (265k) 1995 E320 wagon (295k)
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Discussion Starter #1
Inadvertenly got some coolant on the belt changing the T-stat. It made the belt squeak/slip. So got my can of belt dressing (gives belts traction, kinda sticky) out and began spraying the belt. It quieted at first, then began squeaking again. So I noticed it was not covering effectively.
But once I got the dressing in the V-ribs I noticed it quieted, then a new metallic sounding noise started. I checked each accessory with a screwdriver to the ear. Nothing abnormal. But the belt was not entirely covered in the dressing.
So I added more, got an even coat and the noise stopped.

What I'm thinking is, it was the tensioner shock, when the tensioner encountered grip, then no grip on the belt. I had heard when the tensioner shocks rubber ends wear it made a similar noise.

In the end both noises are gone, so anecdotal evidence, but I think belt condition may cause a rather unsettling metallic noise. Thankfully it was cured with a $2.99 can of belt dessing.

Anyone else encounter this?
 

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Used to drive 1995 C280, Used to drive 1987 300E (wrecked, sitting in garage)
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my tensioner shock went out, and it sounded like a damned diesel..

put like a rachet onto it and see if it shuts it up..

also never use dressing on belts they just dry them out
 

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E320/E250 Bluetec Ford F350 6.7l
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You do know that belt dressing is going to shorten the belt life, don't you?
Serpentine belt squeaking is not a good sign. I could understand that with coolant on it and alternator recharging the battery after the repair -it could give some noise till the belt dries, but I would suspect you have a bearing locking up and that is what cost slippage. Remove the belt and move all the components by hand.
 

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Timeship, see you yesterday, but you already knew that.
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^^^^Not to mention that belt dressing is for V belts. There is no product in the world for a slipping serpentine belt.


The grooves are just to small, dressing will only make it worse on a serpentine belt.
 

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04 odyssey (265k) 1995 E320 wagon (295k)
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Discussion Starter #5 (Edited)
Jedi,
Yeah I put the screwdriver everywhere, and couldnt find the noise. It appeared after slight "dressing", and dissapeared just as quick once the belt was grippy.

Far as conditioner goes. I know it has a solvent, but the thin layer of rubber I may have removed was contaminated with antifreeze. The belt dressings solvents applied in a hot enviroments dissipate quickly. So I do not have any worries about significant damage.

And I know for sure it was coolant contamination. Belt dressing a good belt once will not significantly affect its life. Repeated applications on a borderline one will. I've used it more than this (probably 3x) on my Oddyessy at 90K, and with 182K, and 7 years now the same belt is still going strong. I think a can's gotta know his limitations though. Its actually "belt conditioner", like that changes anything...

Funny though that Kajtek is warning me about doing something potentially damaging.
 

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W124 E420 : W220 S500 : W222 S550
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your mercedes is very very good at maintaining proper belt tension if all is correct. look a little bit more for the source - bad tensioner, bad pulley, bad equipment, etc..

I am guilty of using belt dressings in my pre-mb days.

The mb belt will be near silent when all is correct - no external help needed.

yep.... your mb is that good even at 17years old or more........LOL
 

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E320/E250 Bluetec Ford F350 6.7l
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Serpentine belts last for 500,000 miles easy, so having one at 183k is not proving you did not shorten its life.
But if the tough makes you happy ....
 

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04 odyssey (265k) 1995 E320 wagon (295k)
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Discussion Starter #8
Kafklatch,
Yeah it is coolant. Belt never slipped, I did T-Stat, got coolant on belt and slipped right after T-stat. So unless something mechanical failed while I was doing my t-stat I'm leaning 99% towards the spilled coolant. No way I'd just slap a can of anything "fix it" oriented if something mechanical failed. I even listened to all accessories just to be 100%sure.

Kaj, thanks for the tidbit.
 

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Timeship, see you yesterday, but you already knew that.
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Ok I'll say it.


Clean all of the groove tracks before you install the new belt. Every pulley has to be cleaned.
 

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04 odyssey (265k) 1995 E320 wagon (295k)
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Discussion Starter #10
Yep,
I agree, when I do new belt, I plan on using brake cleaner and a rag to get all residue off.
It will be a little more time, but on this one I'm taking the time upfront (not doing belt/tensioner now), and will have to pay for the time later.
 

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04 odyssey (265k) 1995 E320 wagon (295k)
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Discussion Starter #11
Update...It was the belt.
Suprised a sticky belt could make such a racket. Sounded like marbles in the power steering pump. Changed out the belt, tensioner is good, and its quiet as a church mouse.
Thought I could get away with the conditioned belt until I had more time, but it ended up forcing me to find time and replace it. I gambled and lost. But I guess I won because a tandem pump is $500, belt....much less.

Mercedes Mechanic...I made sure and cleaned everything up real nice :)
 

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Timeship, see you yesterday, but you already knew that.
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Update...It was the belt.
Suprised a sticky belt could make such a racket. Sounded like marbles in the power steering pump. Changed out the belt, tensioner is good, and its quiet as a church mouse.
Thought I could get away with the conditioned belt until I had more time, but it ended up forcing me to find time and replace it. I gambled and lost. But I guess I won because a tandem pump is $500, belt....much less.

Mercedes Mechanic...I made sure and cleaned everything up real nice :)
Yea a lot of people forget to do that and causes a chirp chirp chirp sound if there is something in one of the grooves.
 
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