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  #1  
Old 01-27-2017, 10:21 PM
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Replacing Water Pump OM617

Water pump on my 1983 300CD was leaking coolant from the weep hole so I'm in the process of swapping it out with an OEM water pump. During re-installation, I noticed that the pulley that attaches to the water pump and cooling fan rubs against the crankshaft dampener during test fit. I believe the pulley is pushed completely onto the boss of the water pump and I don't think I bent it during removal. Any thoughts on why I'd suddenly have a collision between water pump pulley and crankshaft dampener? Thanks.
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Old 01-27-2017, 10:58 PM
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Can the pulley be installed backwards?
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Old 01-27-2017, 11:13 PM
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Quote:
Originally Posted by Fitts07 View Post
Can the pulley be installed backwards?
Definitely not. It would be off by at least 3 inches.
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  #4  
Old 01-27-2017, 11:19 PM
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Long vs short pump?
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  #5  
Old 01-27-2017, 11:48 PM
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Quote:
Originally Posted by gmog220d View Post
Long vs short pump?
How to tell the difference?
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  #6  
Old 01-28-2017, 12:12 PM
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compare old parts.
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Old 01-28-2017, 04:51 PM
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Quote:
Originally Posted by chasinthesun View Post
compare old parts.
I could have been more specific. The W115 240D I have uses the long water pump. I've worked on W123s that use a shorter, stubby pump. I'm not sure which engines in which chassis have which pump, but it's obvious when you put them side by side. Where'd you buy your new pump, GE? Pelican is pretty good about making sure you get the right part for your rig.
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  #8  
Old 01-28-2017, 07:34 PM
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I must have the shorter pump. I measured against the new pump and they are the exact same size.

I took another look at the water pump pulley today and turns out it was actually pretty bent. I went to the junk yard and found a W126 with an OM617 from the same year, however the pulley on the W126 was slightly smaller in diameter and a little bit skinnier. I pulled it off anyway and noticed that it was stamped with the MB insignia and had a 617 part number on it. The old one that I took off my car did not have the MB insignia on it, which I thought was strange because there are very few parts I've ever seen on these cars that aren't branded with the 3 point star. I'm wondering if the pulley on my car is the original or if someone slapped it on there over the years. I think I'm going to install the new smaller pulley on the car and assuming I can adjust the tension sufficiently on the belt, just see how it does.

Here is a side by side photo (old on left, new on right):

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Old 01-28-2017, 08:24 PM
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Yup. Thats one of the "upgrades " you could do from parts of a w126 to w123s. Some other parts include front brake disc and calipers and with some mods the brake booster, rear window regulator, condenser and condenser fan.
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  #10  
Old 01-28-2017, 09:33 PM
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be careful. all the turbo motors have double pulleys and take slightly narrower belts which will slip on the pulleys designed for single belts. I think I have a good single pulley if you need one.
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Old 01-28-2017, 10:40 PM
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Quote:
Originally Posted by t walgamuth View Post
be careful. all the turbo motors have double pulleys and take slightly narrower belts which will slip on the pulleys designed for single belts. I think I have a good single pulley if you need one.
Both old and new pulleys are double belts. My motor is a 617 turbo.
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  #12  
Old 01-29-2017, 12:01 AM
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2 Vacuum Pumps destroyed timer Bushing Identified as the problem
http://www.mbca.org/forum/2013-12-29/why-are-these-vacuum-pumps-being-destroyed
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  #13  
Old 01-29-2017, 12:15 AM
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Quote:
Originally Posted by Diesel911 View Post
2 Vacuum Pumps destroyed timer Bushing Identified as the problem
http://www.mbca.org/forum/2013-12-29/why-are-these-vacuum-pumps-being-destroyed
Link goes to a main page. What is the article about?
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