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Old 07-04-2012, 06:49 AM
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Question Need advice changing vacuum pump

Hi all,
I started tearing into my E350 to change the vacuum pump, but need some advice. The only way I see to get to the serpentine belt tensioner is to remove the fan. In order to do that, I need to remove the radiator. I've got the shroud off, but there's no way I can remove the radiator w/o first removing the next heat exchanger - trouble is, not sure what it's for. It lives between the A/C and radiator. It has lines coming from/feeding engine/water pump. Could this be the oil cooler?? It has some serious lines feeding it. Can I remove these lines, or are bad things going to happen if I do?

Any tips would be most appreciated - it's my first time tearing into this beast and there's not alot of diagrams out there for the E350.
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Old 07-05-2012, 05:50 PM
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You do not need to remove the fan or the shroud to spin the belt tensioner. After removing the air filter box, all you need is a long 1/2" torque wrench and place it in the square hole in the middle of the tensioner and turn it until the belt is loose enough to remove it. I usually am able to spin the torque wrench with one hand and remove the belt from one of the pulleys from the other hand. Just be carefull you don't crack the fan blades, as the torque wrench will be almost right up against it as you turn it.

I had to replace my vacuum pump twice, which I purchased from O'reilys (first one was made in china and the second was made in Italy), and only took me about an hour to change. You do not need to remove anything other then the belt, vacume hoses, and the bolts.

Last edited by Xphobe; 07-05-2012 at 05:54 PM.
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