Can anyone send me a diagram of a 300E 86-92 serpentine belt path and associated tensioners, pulleys, ect. Can't find in any past threads. I do not have manual or CD for it. Would be very much appreciated.

which exact part number are you looking for?

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2010 ML350 Bluetec
2012 Mustang Convertible

tensioner

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2010 ML350 Bluetec
2012 Mustang Convertible

Thanks Raffi, The part I was looking for was the idiler pulley and the tension adjustment. I'm hoping that I ordered the correct part , top left pulley facing the engine. I'm not exactly sure if the bottom left pulley is included in my 300E. I believe the most bottom pulley I have on my vehicle is the alternator.

As I thought I do not have 9 pulleys, only 8, the bottom left one does not exist. The dealers diagram shows the same, what's up? Whats the pattern for my design.

Isn't the bottom left pully the tensioner ? If not which one is the tensioner? Also you might get more response if you post it in the tech section.

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2010 ML350 Bluetec
2012 Mustang Convertible

I thought the bottom left pulley is the alternator??? Maybe the AC compressor?

I believe the center right pulley (smaller one) is the tensioner.

Yes bottom left is the alternator and yes the tensioner pulley is in the center, still can't get belt to fit, very perplexed...

Were you able to release the tensioner???

I tried to do this myself as well but gave up because I couldn't figure out the tensioner. It looked like there was this bolt and nut thing against a plate above where the tensioner is but messing with it did nothing for me. No surprise, a year later I had to replace the tensioner, most likely because I messed it up then.

I know I'm no help but good luck to you sir.

Still trying to get the belt to fit, have not touched the tensioner yet. Starting to think I have a belt that's too long.

Spencer 300E - Shure it will be too long if the dealer specs call for belt for 9 pullys and your car has 8. Do you know which pully for which component is missing in your case? could it be the airpump? or A/C compressor? in one response you say lower left pully is missing then in another response you say the lower left pully is for alternator, I am confused.

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2010 ML350 Bluetec
2012 Mustang Convertible

The diagram i do have have does not show what component is what. But there is another pulley below the alternator in the diagram.