'71 220D leaking coolant - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 06-17-2014, 12:26 PM Thread Starter
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'71 220D leaking coolant

After 15 months of work, my diamond in the rough is back on the road. Unofficially, it went 162 mi on just over 4 gal (!!) But now she's leaking. Actually, she's gushing... not from the water pump or gasket, but from the bracket-thingy that connects the water pump to the engine block. Anyone experience this before? What will I find when I take this bracket off? Is there a gasket? Or just metal to metal? Is this where the gremlins live?
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post #2 of 4 (permalink) Old 06-17-2014, 03:41 PM
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Sounds like this might be the thermostat housing. It should have a gasket or an O-ring
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post #3 of 4 (permalink) Old 06-17-2014, 05:10 PM
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the water pump bolts on a housing , the housing bolt on the engine block with 1 gasket . are you sure the pump does not leak at the bottom vent hole . if not but at housing , you may have a pin hole in the aluminum .do you have a/c on this car ????
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post #4 of 4 (permalink) Old 06-18-2014, 11:31 AM Thread Starter
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The leak -- ok, more of a gush -- is between the water pump housing and the engine block on the lower left side. There was a bolt there, so I removed it and found it to be severely stripped. Apparently this has been a problem in the past and someone tried to fix it by tightening the bolt beyond reason. I put a new water pump on it last week, and I bet that pounding on the old pump aggravated this problem. I just wish I'd known about it last week when I had it apart already...

The car used to have A/C, but the compressor's shot and the blower has literally disintegrated. I had to loosen the compressor bracket to get to the water pump, so I just took it off completely -- and I'm glad I did.

It also has a fairly new thermostat and the housing is in good shape.
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