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  #1  
Old 10-25-2020, 05:00 AM
240D.Bill's Avatar
240D.Bill
 
Join Date: Sep 2016
Location: Vancouver, WA
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What’s wrong with this picture?

OM616.912
My water pump housing seems to be missing a bolt... two actually. Now clearly the housing was cast and drilled for 4 bolts but the problem is that there are no holes tapped into the block behind either of them.
Am I alone in this oddity?

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  #2  
Old 10-25-2020, 12:01 PM
t walgamuth's Avatar
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Location: Lafayette Indiana
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I bet there is a broken off bolt in the block where that place for a bolt sits.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #3  
Old 10-25-2020, 05:13 PM
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240D.Bill
 
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Quote:
Originally Posted by t walgamuth View Post
I bet there is a broken off bolt in the block where that place for a bolt sits.
Could be but two of them? What are the odds? Still I can’t think of a more plausible explanation.
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  #4  
Old 10-26-2020, 09:47 AM
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Quote:
Originally Posted by 240D.Bill View Post
Could be but two of them? What are the odds? Still I can’t think of a more plausible explanation.
Pretty easy to do with a long enough breaker bar.
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  #5  
Old 10-26-2020, 10:20 AM
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Location: Albuquerque, New Mexico, USA
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Hey 240D.Bill,

The OM616.916 in my '74 doesn't have a bolt in that location. The water pump housing does not have a place for one as part of its casting. I'm guessing that all OM616 blocks are the same in this respect. Here's what the front of mine looks like:


And with the pump housing installed:


Maybe you have a later style water pump housing on your engine. From a OM617?
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Last edited by gmog220d; 10-26-2020 at 01:43 PM.
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Old 10-26-2020, 02:33 PM
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From the Engine Book

Here's an image from the cooling system section in the FSM for OM615, OM616, and OM617NA, showing what I assume to be a later version of the water pump housing:



The book doesn't indicate on what engine this was introduced.
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Last edited by gmog220d; 10-26-2020 at 06:30 PM.
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  #7  
Old 10-26-2020, 11:14 PM
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240D.Bill
 
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Very interesting...

That makes a lot of sense. God only knows how or where these parts were sourced. The engine plate indicates a factory rebuild. Oddly the engine number has been removed with a grinder. That’s always been a red flag for theft in the past but when I inquired in the past more than one person told me that Mercedes does that on a rebuild. It works so I guess I can’t complain. Thanks for all the feedback and photos.

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