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#1
10-20-2004, 06:18 PM
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Coolant Fill / Burp 1967 Mercedes
Hello,
I have a 1967 mercedes 230 6cyl (W110 fintail), and am wondering how to fill/burp the coolant system. I've read several posting for newer years and not sure if these apply. I've never quite seen a system like this before, there is no fill cap on the radiator. The system if you can imagine goes like this Coolant overflow tank contains -> Small puke valve from radiator -> Drain hose that goes to bottom of engine Radiator contains -> Upper radiator hose directly connected to a weird thermostat housing which in turn is directly connected to the water pump and engine block -> Puke valve to radiator. Basically I can't see how the radiator is filled fully w/o having a fill cap. Do I fill the coolant tank, turn on the engine and the coolant will flow into the radiator? 
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#2
10-20-2004, 07:48 PM
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That's not really an overflow tank -- should be a 'real' overflow tank somewhere else, usually under the fender.
Pressure cap is on tank, make sure it's good. Fill tank all the way up until engine will not take more coolant, then squeeze the upper radiator hose flat, crimp the small hose closed, and release upper radiator hose. This will pull coolant into the rad. Repeat until no more air bubbles up in the tank, then run engine until the thermostat opens. Keep coolant in the tank so you don't pull any extra air in. Should start pulling coolant down in the tank when the thermostat opens. TAke your time, there is a bleed in the thermostat to allow the air out of the head, but it's slow. Make sure the heater levers are on full heat to purge the heater core, too. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#3
10-20-2004, 11:33 PM
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Can't you just remove the upper hose from the radiator and keep pouring into the tank until fluid comes out the hose then reattach? I did that to my SD and it works. I'm not necessarily saying my way is always right, but it worked. I don't think my way would get all the air out, just the big majority of it. Ditto on keeping the tank full while bleeding (also keep heater on high).
Thanks David
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_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________
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#4
10-21-2004, 10:12 AM
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I'm a bit confused by your terminology and am not familiar with your particular car. I'm a bit surprised by the system in your sedan because all the sedans I have seen have had a radiator cap on the radiator. However, my 1967 250SL is similar to the setup you describe. The two hoses on the reservoir are for the vent line from the radiator (small line to top of reservoir) and a drop line to the bottom of the radiator (not the engine - although teeing into the lower radiator hose would do the same thing). The reservoir acts as a head tank. You fill through the reservoir. I usually remove the temperature sensing connection at the cylinder head to vent the block and head when refilling a system that has been drained because these systems did not vent very quickly. The thermostat setup sounds like typical M-B practice of the day.
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