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  #1  
Old 05-13-2007, 10:26 PM
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Annoying Water Leak - W124 2.8

Within weeks of getting my W124 300E 2.8 back on the road again with a new transmission, (amongst other things) it's developed a coolant leak and I can't seem to be able to trace it.

When I pour coolant into the expansion tank, it almost immediately pours out of where-ever the hole is. It does slow down after a while and stops pouring out when the water level is just above the coolant temperature sensor but I have seen the tank empty after the car has been sitting for a few days and the coolant has steadily dripped out.

Looking under the lower engine shield the coolant is running from behind the A/C Compressor and along the side of the oil pan and then onto the lower engine cover. The bottom of the radiator is dry, I don't suspect that. I also don't suspect the head gasket as the water doesn't seem to be coming from the passenger side (where I believe the M104's leak most often) and I had it replaced back in 2005. I can't see an obvious water leak from the top of the engine (but I've not discounted the fact that I'm looking in the wrong place).

I had the water pump replaced in november 2002 (about 60,000 miles ago). Is it time to get this replaced again or could something else be wrong?

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1993 300E2.8 - 196K
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  #2  
Old 05-13-2007, 11:17 PM
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I'd start by taking off the belly pan and seeing where it hits the ground. It doesn't sound engine related if it's doing it with the engine off.
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  #3  
Old 05-13-2007, 11:50 PM
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The water hits the ground on the left (driver's side) of the engine. It's running down the side of the oil pan (about half-way down it's length) and dripping off the edge of the pan.
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  #4  
Old 05-14-2007, 03:43 AM
t walgamuth's Avatar
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Location: Lafayette Indiana
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this sounds like a loose hose or similar, not a cracked block or anything mechanical to me.

you just have to provide yourself additional light and mirrors on a hinge or a periscope to get down there and see where it is coming from.

tom w
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 05-14-2007, 01:44 PM
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Sounds like the coolant is leaking form the water pump's weep hole. Check around the water pump for leaks.
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  #6  
Old 05-14-2007, 01:57 PM
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Sounds like water pump to me; the location you described is almost exactly the area where it will leak when this goes. True, you recently had it replaced, but I would check it out anyway.
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  #7  
Old 05-14-2007, 08:00 PM
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My first feeling was that the water pump was going bad, but I wanted suggestions from others - I seem to remember that it was dripping in a similar pattern last time I had the pump replaced. I've already taken a look at the hoses, and none of them seem to have the white crystals that I'd expect to see from a leaky hose.

Is a water pump replacement a DIY-able job? I've sucessfully tackled the replacement of the fan bearing and clutch before without too much difficulty. Going through the repair CDs I know I'm looking at 20-2100, but do I have to do 13-3200 and 20-3120 (belt tensioner removal and viscous fan clutch removal) also?

Are there any special tools I need? Some of those allen bolts look tricky to get to.
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  #8  
Old 05-16-2007, 06:09 PM
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Blatent bump - Anyone know of any specific special tools to get to some of those tricky water pump allen bolts?
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  #9  
Old 05-16-2007, 07:36 PM
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Location: Jax, FL
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I have the snap-on which makes the job easy...

Some people were able to do it without this tool but, I bought it. I can rent it to you. If interested, send me a pm...

Good luck!

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