Anti-Electrolysis/Sacrificial Anode 13lb Radiator Cap, 66-77 Ford Bronco SKU: 5046

Anti-Electrolysis Radiator Cap - 13 lb

When installing a new aluminum radiator in your early Bronco or other classic vehicle, it is essential to guard your new radiator against electrolysis corrosion. This custom radiator cap features a sacrifial anode that helps to prevent galvanic corrosion, also known as electrolysis. Our electrolysis prevention radiator cap fits all standard early Bronco radiators including V8 radiators and 6-cylinder radiators.

 What is electrolysis and why is it bad?

Electrolysis occurs when two dissimilar metals are in contact with eachother and with a conductive electrolyte causing the lesser of the two metals to corrode. In the case of an early Bronco aluminum radiator, the radiator is made of aluminum and the engine block is made of cast iron. The antifreeze in the system contains the final piece of the puzzle in providing conductive electrolytes. Without treatment, the aluminum in the radiator being the lesser of the two metals (and other soft metal engine componenets) will quickly begin to corrode. This can result in costly or irreparable damages.

How does this anti-electrolysis radiator cap prevent electrolysis?

The sacrificial anode attached to this radiator cap hangs down in the antifreeze solution inside your new aluminum radiator. The anode is made of a metal with a more active voltage than the aluminum of the radiator. Because of this, the anode will oxidize more quickly than the other metals in the system, sacrificing itself to be fully consumed before the aluminum and other soft metals begin to react with the electrolytes. 

How often do I need to replace a sacrificial anode?

Typically, a sacrificial anode will last about 3 to 5 years before being fully consumed and requiring replacement. The length of time the anode lasts is dependent upon many factors including the quality of the antifreeze solution and how much and how often the antifreeze passes through the system. It is best to check the sacrificial anode every 6 months and replace when necessary.