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  #1  
Old 08-02-2003, 09:16 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
300E leaking coolant near water pump

Hello board, My 1987 300E is leaking a stream of coolant near the water pump, the water pump has only been on my car for about 6 months. I thoroughly inspected the water pump and the leak isnt coming from the water pump. Could there be a freeze plug besides the water pump that the coolant could be leaking out of? If so is replacing the freeze plug a simple DIY, will I have to remove the water pump to replace this freeze plug? Could there be any other culprits causing this leak? I also thoroughly inspected the hoses and there isnt any leak, only the area near the water pump.


HELP!!!
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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #2  
Old 08-02-2003, 10:04 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,743
Reach under the water pump and feel the weep hole. It's about at the 7 o'clock position looking into the pulley. If it's wet, it's the water pump. There's an o-ring between the water pump and block that might be leaking. There's also a back cover of the water pump that can leak. Are you sure it's not the heater hose that goes into the side of the thermostat housing?

I don't think there's a freeze plug anywhere near the water pump. Check out the pics at photos.yahoo.com/tabijan in the 91 300SE water pump album. Might give you some insight.

Check the archives also. Within the last couple of months someone posted about replacing a freeze plug for $70. Might be the same problem as you're having.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #3  
Old 08-03-2003, 08:08 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Hello board, I did a thorough examination of the area and I see that the leak is coming from the area where the water pump is attached to the engine block. Do I have to remove the water pump and then add a gasket type sealant to the area?
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #4  
Old 08-03-2003, 08:43 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,743
There's an o-ring between the water pump and the block. It's less than $2.50 from the dealer if you can't wait for FastLane. I used a dab of sealant to keep the o-ring in place while wiggling the water pump into place.

I dismissed the recommended Snap-on tool because I can get to the upper rear bolt with a 1/4" socket arrangement. However, I had to remove the dipstick to use the 1/4" socket arrangement and that allowed coolant to drain into the sump. If the Snap-On tool allows you to get to the rear upper bolt without removing the dipstick, then it's worth the money IMO.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #5  
Old 08-04-2003, 08:30 AM
LarryBible
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Posts: n/a
The FLXM 13 is difficult to find. I couldn't even buy one on the Snap On website, they were out of stock. Maybe they have some now. After going through this myself, I believe the tool is worth the $45 or so.

You can use grease to hold the o-ring in place while fitting the pump and starting a few bolts.

Good luck,
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