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Old 08-30-2021, 10:03 AM   #1
philcobill
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Question Surface Rust in Coolant Passages.

There is surface rust in the engine coolant passages in my 29 Special Coupe. The rust in the photo looks worse than it really is. I poked my finger into the holes and was able to almost wipe it off. I did not see any scaling or blocked passages in the block, and I imagine that things are okay below where I can't see.

My question is, is this something that I need to address now or should I wait and treat things after I get the head back on and things buttoned up? What would be the best way to address this?

Also, there are some minor scratches on the block. How should I addressed those?

Bill
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Old 08-30-2021, 10:58 AM   #2
edzaha
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Default Re: Surface Rust in Coolant Passages.

Flush it and forget it, not that bad
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Old 08-30-2021, 11:03 AM   #3
alexiskai
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Default Re: Surface Rust in Coolant Passages.

Address it after the system is sealed, using a de-rusting product like Thermocure or Rust911. Users of this forum have reported success with both; just follow the directions.
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Old 08-30-2021, 05:09 PM   #4
mercman from oz
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Default Re: Surface Rust in Coolant Passages.


Surface Rust in Coolant Passages.
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Old 08-30-2021, 09:43 PM   #5
Tom Wesenberg
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Default Re: Surface Rust in Coolant Passages.

Turn it upside down and blow out the junk shown in the picture.
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Old 08-31-2021, 01:40 AM   #6
updraught
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Default Re: Surface Rust in Coolant Passages.

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First off, i'd get a Gano filter or similar to stop the rust chunks blocking the radiator, especially if it is a new one.
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Old 08-31-2021, 06:35 AM   #7
Bob Bidonde
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Default Re: Surface Rust in Coolant Passages.

The rust you see is normal.
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Old 08-31-2021, 11:44 AM   #8
Chuck Sea/Tac
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Default Re: Surface Rust in Coolant Passages.

I think if you run some flex cable thru the passages you can, you’ll have more than surface rust coming out.
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Old 08-31-2021, 09:01 PM   #9
SteveB31
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Default Re: Surface Rust in Coolant Passages.

Run 50/50 anti freeze and this will not happen on the future
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Old 09-02-2021, 09:49 PM   #10
Tom Wesenberg
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Default Re: Surface Rust in Coolant Passages.

Quote:
Originally Posted by SteveB31 View Post
Run 50/50 anti freeze and this will not happen on the future
For sure, and it will also save many blocks from cracking during the winter months.
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Old 09-02-2021, 10:04 PM   #11
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Default Re: Surface Rust in Coolant Passages.

Not a problem. Run anti freeze or rust inhibitor.
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