electrolysis attack of thero-housing - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 2nd, 01, 05:57 PM Thread Starter
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joseph l clance
 
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Question

Has any one experienced leaks thru the thermostat housing due to electrolysis? I had leaks the appeared to be from internal corrosion of the chrome thermo housing. Is there a stainless available. Does this bode well for aluminum intakes and other bi-metals that come in contact w/ cooling fluid and stray voltage potentials? Or, it this a good thing as this may act as a sacrificial anode and save other expensive and difficult to replace components?
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post #2 of 5 (permalink) Old Apr 2nd, 01, 09:06 PM
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Umm, I hope your thermostat housing isnt acting as an anode! Where is the voltage coming from? Technically it is impossible...the housing isnt isolated from the intake/block so you cant have a different polarity in the housing than what is in the intake. I think what you are seeing is simple corrosion. Running straight water as a coolant will drastically speed up the corrosion process. Try finding a pot metal thermo housing instead of an aluminum one (they were used for many years on small blocks)...I would go this route over chrome myself, as pot metal is suprisingly durable for this application. You may have to hit the salvage yards to find one.

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post #3 of 5 (permalink) Old Apr 2nd, 01, 09:22 PM
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I havent had any problems yet but I have been running a sacrificial anode in my cooling system just in case. It installs under the rad cap and hangs down into the tank of the radiator. I know lots of boats run them so when I saw one for a car I figured its cheap insurance.

[This message has been edited by my69gofast (edited 04-03-2001).]
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post #4 of 5 (permalink) Old Apr 2nd, 01, 10:16 PM
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Electrolysis is a lot more common than one might think. Anytime two disimilar metals are bonded together, there is a voltage potential.
If you have a boat (especially in salt water) and you don't have sacrificial zincs, you won't have metal parts for long.
Anodes are cheap insurance.
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post #5 of 5 (permalink) Old Apr 3rd, 01, 08:53 AM
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If you must have chrome ....try a housing with a rubber o-ring built in..I have had one on my 69 for years with no leaking problems. My housing shows no signs of corrosion nor does the intake. I also change my cooling fluid every spring too.
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