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#1
03-10-2011, 07:04 PM
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What Is This Extra Outlet On The Water Pump?
What is this extra outlet below the pulley? Is that the weep hole (or weep nozzle as it appears)?
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black 
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#2
03-10-2011, 08:35 PM
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On my old 400E, there was a brittle black plastic hose (approx. 3/8" OD) that is designated as a "tank with cooling line" (see #110 in picture). It tapped off a similar looking port on my water pump and ran vertically down to the front outside base of my oil pan. The tank attached with a screw. I think it was some sort of catch tank for the water pump. I installed a new pump, but never replaced the hose or tank and it never seemed to matter. Have you checked the EPC for your car to see if there is a similar part?
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1993 400E, 256,000 miles (totaled) 1994 E420, 200,000+ miles 1995 E420, 201,000 miles
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#3
03-10-2011, 09:04 PM
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The OEM pump# for my car is 104 200 4701. This cross references to 104 200 4901, which is what I have.
In looking at photos the pumps all have this hole; I just never noticed it. Only a couple, mine and it appears Laso brand pumps also have the extended nozzle/hose fitting. This one also has the mod kit to close off the rear outlet and one of the sensor ports on the top is sealed. I have two so I can use the open one on the side.
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2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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#4
03-11-2011, 08:11 AM
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Weep hole.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
03-11-2011, 09:05 AM
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mbdoc, have never seen a weep hole like that. Certainly looks like a hose connector to me. A weep hole is, as the name suggests, a small hole (approx. 1/4" diameter) in the bottom of the water pump casing that weeps coolant when the shaft seal is leaking. When the weep hole leaks coolant you know it's time to replace the water pump.
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Fred Hoelzle
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#6
03-11-2011, 04:30 PM
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Quote:
Other new pumps have the hole; just not the connector (except for Laso-branded). I am guessing that the square reservoir on the structure that the water pump, tensioner and PS pump(?) bolt onto is a relatively recent addition for capturing leaking coolant, thus the elimination of the hose attachment.
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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#7
03-14-2011, 12:38 PM
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Replaced my pump yesterday. The OE MB pump also has it.
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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