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#1
07-29-2007, 06:07 PM
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240D water pump question
Per records from po, a new water pump was installed approx 10k miles ago. In pic below, there is a hole approx 3/16" dia on the top of the housing and I can see the shiny shaft spinning thru the hole. Should it be open and exposed to the element like that? Shouldn't it have some type of a plug or seal?
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked 
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#2
07-29-2007, 06:55 PM
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Holes in water pumps.
Both of my 300ds have that same hole on top, chevy and ford put it on the bottom. My understanding of the hole is that it signals replacement time when water starts dripping due to worn out bearings / seals.
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 1983 Mercedes Benz 300D Turbo (Daily Driver) 1979 Mercedes Benz 300CD (Needs Lotsa Work) 1963 Chevrolet C10 Stepside Shortbed (Not Stock) 1999 Chevrolet Silverado Z-71 (Fun to Drive) 2007 Nissan 350Z (Wifes Car - Lucky!)
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#3
07-29-2007, 06:57 PM
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Thats how it's supposed to be, your not missing a plug or anything.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#4
07-29-2007, 06:59 PM
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Thats a vent hole. If plugged, pressure of a spinning shaft would dislodge the seals.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#5
07-29-2007, 08:02 PM
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Well I learned something today! Guess it would be bad to build any pressure between those bearings and seals!
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1983 Mercedes Benz 300D Turbo (Daily Driver) 1979 Mercedes Benz 300CD (Needs Lotsa Work) 1963 Chevrolet C10 Stepside Shortbed (Not Stock) 1999 Chevrolet Silverado Z-71 (Fun to Drive) 2007 Nissan 350Z (Wifes Car - Lucky!)
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#6
07-29-2007, 08:06 PM
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It's called a weep hole. If the seals are leaking it will weep coolant through the hole to alert you of a bad seal (hopefully) before the bearings seize.
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#7
07-29-2007, 08:09 PM
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well now that's what I thought, differing opinions - which one is right? Maybe I already knew this!
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1983 Mercedes Benz 300D Turbo (Daily Driver) 1979 Mercedes Benz 300CD (Needs Lotsa Work) 1963 Chevrolet C10 Stepside Shortbed (Not Stock) 1999 Chevrolet Silverado Z-71 (Fun to Drive) 2007 Nissan 350Z (Wifes Car - Lucky!)
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#8
07-29-2007, 08:12 PM
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I forgot to mention that there are two holes in the pump, one up top and one in the same location underneath.
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#9
07-29-2007, 10:54 PM
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perhaps the top one is to break the hydrostatic tension and allow the coolant to drip freely out the bottom.
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#10
07-29-2007, 10:57 PM
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I think it's more because the pump's flange is symmetrical and can be clocked in most any position.
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#11
07-29-2007, 11:10 PM
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Wouldn't that weep hole that is facing up collect junk and cause problems?
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#12
07-30-2007, 02:13 AM
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I'd imagine so, but then again I didn't design it...
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#13
07-30-2007, 04:43 AM
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Quote:
Tom W
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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