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Old 09-15-2022, 01:32 PM
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Default Freeze plug problems

I noticed I had a coolant leak under my ss396 Camaro that I just had at MCACN in November. I didn't rebuild the engine because it only had 41k on the rebuild. I did change all the freeze plugs because I had one leaking. I used the green coolant 50/50 mix with tap water. I've probably only driven the car 3-400 miles since the restoration. I now have three freeze plugs leaking. The one pictured is one I just removed. These were brand new less than a year ago. The battery is never left connected when in the garage.

I sent this picture to my friend Larry (lbnaz) & he indicates that it's most likely a ground problem causing electrolysis. I guess I need to check my grounds but I wanted to ask if anybody has seen this & maybe, where was the problem found?
Thank you, Joe
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Old 09-15-2022, 01:40 PM
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I always use distilled water when I mix with new green anti-freeze. Too much crud in the tap water here. Maybe the stuff in the tap water is reacting?
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Old 09-15-2022, 01:48 PM
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It never has before but once I resolve the problem I'll change everything out. I will have the old stuff tested that I pulled out....thank, Joe
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Old 09-15-2022, 03:13 PM
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Possibly, the freeze plugs have become a sacrificial anode. Brass or stainless-steel plugs may solve the problem.

https://www.corrosionpedia.com/defin...rificial-anode
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Old 09-15-2022, 03:24 PM
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Seems like all my engines have brass freeze plugs …
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Old 09-15-2022, 03:45 PM
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Quote:
Originally Posted by ban617 View Post
Seems like all my engines have brass freeze plugs …
Normally that's what I do except I was going for as close to original as possible. Do you know how hard it is to find 1-3/4 steel freeze plugs without writing all over them? Not fun....Joe
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Old 09-15-2022, 07:48 PM
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I just dropped off a coolant sample to Caterpillar. They will send it to a lab & I should get results back next week. 20 bucks (cheap) for lab work but I can't lose that engine. i'll keep checking for ground issues....Joe
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Old 09-15-2022, 09:37 PM
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Quote:
Originally Posted by ban617 View Post
Seems like all my engines have brass freeze plugs …
----All my marine engines have brass freeze plugs, even if the boats are in fresh water. My incoming water is super purified (even de-ionized) before it goes anywhere in the house or garage, so no problem there!.....Bill S
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Old 09-15-2022, 09:54 PM
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Quote:
Originally Posted by William View Post
Possibly, the freeze plugs have become a sacrificial anode. Brass or stainless-steel plugs may solve the problem.

https://www.corrosionpedia.com/defin...rificial-anode
What he said.
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Old 09-17-2022, 12:09 AM
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Your coolant that is now in the engine will need to be fully flushed out , it is probably highly out of the PH range. Does your shifter cable seem to hard to move? If it is a bad ground it will try to use it as an alternative.
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