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Premium Member
Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,694 Posts
Discussion Starter #1
Hello all I'm doing my smog pump but I can't loosen the belt! I saw some info in the search forum but there's not a clear explanation of hoe to loosen the belt on a M104 90 300ce. please HELP:crybaby2:
 

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E320/E250 Bluetec Ford F350 6.7l
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36,710 Posts
Maybe a member with exact engine will give you direct advise, but even the same engines can have different tensioners. How about a picture of the one you have?
 

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86 300e Anke
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1,252 Posts
Being as generic as I possibly can...

There is a large bolt running thru the center of the tensioner. Loosen that.
There should be an adjusting nut on the end of a rod that reaches down to the tensioner. On my 103 it is LEFT-HANDED and the rod pushes DOWN (turning RIGHT) to tighten the belt. You would need to turn it LEFT to pull the rod UP...
It might need a bit more than that, but between the two, you will likely get enuf slack from pulling on the old belt to get the new one on...

Hope this helps. :D
 

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Premium Member
Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,694 Posts
Discussion Starter #4
Bolt is loose!

The bolt is loose I can see the adjustment...so loose I think it broke, but the belt is still tight 1990 M104 300ce. I must be missing a step!
 

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95 E300, 91 300TE, 84 190D
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782 Posts
I just don't understand why people don't read first

It's in the FSM, right here, in the 124 DIY Thread sticky. As in post above, the Factory Service Manual, with instructions to loosen the large bolt first, then turn the tension adjustment screw.:thumbsup:

So, you post a question, and you can't even wait 30 minutes for someone to respond with directions that would have stopped you from breaking it???
 

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2008 E350 4M, 2016 Audi Allroad, 2019 Audi Q5
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5,447 Posts
Hope you haven't destroyed the tensioner doing it that way...with age the rubber inside gets brittle and wrongly loosening it can break them.

19mm socket, 1 turn loosen, THEN loosen the rod /w 13mm socket....Reinstall/retighten is opposite order. Fingers crossed.
 

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Premium Member
Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,694 Posts
Discussion Starter #10
It's in the FSM, right here, in the 124 DIY Thread sticky. As in post above, the Factory Service Manual, with instructions to loosen the large bolt first, then turn the tension adjustment screw.:thumbsup:

So, you post a question, and you can't even wait 30 minutes for someone to respond with directions that would have stopped you from breaking it???
I think it was already broke...That's why I couldn't loosen it...only the bolt was holding the tension:mad:
 

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1992 300ce, 3.0, 207,00 mi.
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335 Posts
Hey Sam
The main tensioner bolt on your 104 is a 10mm hex. Are you sure you loosened the correct one? There is another bolt down there that can be mistaken for the correct one.
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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Discussion Starter #13
Yeah , I got that ..could barely see it but done.... My tensioner broke at the ring-to-rod ...my rod is still in one piece withe the "C" clamp still on it:confused:
 
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