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#1
09-07-2007, 05:11 AM
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M103 water pump help
I have the telltale signs of a bad water pump on my '88 300 SEL. I have been reading for about three hours now, and haven't found any diy posts for the m103. I found a ton of posts referring to previous write-ups for this jobs, but nothing that was still archived. Anyone have any advice? I understand that the w126 service cd's are no longer available, would anyone that owns a CD be willing to print off and mail me the needed water pump and belt tensioner (never been replaced) pages? If you could email it that would be even better.
From what I read it looks like I need: water pump o-ring for water pump hose from pump to engine thermostat belt tensioner belt tensioner shock serpentine belt snapon tool flxm13 Anything else I am overlooking?
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Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4 
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#2
09-07-2007, 09:05 AM
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You also need the o-ring for where the little metal coolant pipe connects to the pump and probably the o-ring for the thermostat. Also you will need the threaded rod for the tensioner. Might as well replace the radiator hoses since they will be off.
Sears sell a 1/4" 13mm swivel socket for $7.50 you can use instead of the Snap-On tool. There should be plenty of DYI info on this on this site. You can start with this: Bad Water Pump? This is your goal...
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2012 E350 2006 Callaway SC560
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#3
09-07-2007, 11:22 AM
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i did this job recently on my 103.definately recommend removing the radiator to make access easier.a good opportunity to clean the rad ,condensor completely as well
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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon
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#4
09-07-2007, 01:23 PM
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I'm about to order parts. Just want to make sure this sounds like water pump to everyone...
Started seeing spots of coolant on the ground yesterday. Coolant drips off of the oil pan. Can't really make out exactly where it is coming from, but it looks like it is coming down from somewhere near the back of the water pump. If this were a headgasket leak would it come from the same spot? Here are photos I snapped, though they only show where the leak ends up, not where it starts
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Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4
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#5
09-07-2007, 02:46 PM
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They usually leak from the shaft. However, my last one was leaking between the pump and the block. It looked like yours.
BTW, be careful letting people here see that green coolant!
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2012 E350 2006 Callaway SC560
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#6
09-07-2007, 02:55 PM
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My only excuse is that I'm not the one who put the green coolant in there. Have been slowly going through car since I bought it a year ago fixing things. Was going to get around to changing the coolant out. . .
Now it will just be a very complicated coolant change.
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Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4
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