| fordmerc | -- 08-01-2013 @ 5:42 AM |
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I need great minds to help me find a coolant leak: '39 Mercury, rebuilt engine, Skip rebuilt water pumps, pumps installed by engine rebuilder. 250 miles on engine. Water leak seemed to be at bottom of radiator, especially near right lower hose (that's where most of the water was when just a little bit leaked). Coolant all over engine compartment. Never saw a source. I pulled the radiator but it does not leak, nor do the hoses (new). I cannot see anything around the water pumps that would suggest they are leaking. Leak occurs only after 5 miles or so; idling until engine hot does not cause leak. I am desperate for suggestions for further steps to take before reinstalling radiator. Advice greatly appreciated.
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| deuce_roadster | -- 08-01-2013 @ 6:48 AM |
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Maybe the pumps are blowing the water out of the overflow at higher RPMs. Try putting a piece of rubber hose on the end of the overflow and direct it into a vessel to see if this is where the water is coming from. You may need to make or purchase an overflow tank. If water is all over the radiator, maybe the cap is the problem.
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| FrankM-RG5 | -- 08-01-2013 @ 7:09 AM |
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You may be overfilling it. Radiator cap could also be leaking. If you fill it to the top then the coolant will expand and push water out the overflow.
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| supereal | -- 08-01-2013 @ 5:13 PM |
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You will need a pressure tester that mounts on the radiator filler neck. That way, the system can be placed under pressure for a long period to allow detection of leaks. Most shops have these available. If you don't see an external leak, it is likely an internal leak such as a head gasket or block crack. As said above, if you fill the radiator higher than the bottom of the filler tube, thermal expansion of the coolant will force out the excess.
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