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RADIATOR CAP RUST

  • Aris Loumidis
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05 Dec 2021 16:00 #44388 by Aris Loumidis
Replied by Aris Loumidis on topic RADIATOR CAP RUST
As Roads2run suggested I got back the cap from powder coating and it certainly looks great, especially underneath! It should last because I don't see any bare metal exposed; even the copper piece that locks it in place looks well coated !
If any problems uccur, I'll post an update otherwise maybe problem resolved!
Cheers all!
Aris
Aris Loumidis
Athens, Greece
ACD Life Member
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1936 CORD 810 Phaeton
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  • Aris Loumidis
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21 Nov 2021 10:35 #44308 by Aris Loumidis
Replied by Aris Loumidis on topic RADIATOR CAP RUST
Well on second thought I checked it out and even though the grease did seem to offer some protection, I am sending it for powder coating as Roads2run suggests. I'll do the whole cap in black, top and underneath and see how that goes, will post results!
Aris Loumidis
Athens, Greece
ACD Life Member
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1936 CORD 810 Phaeton

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  • Aris Loumidis
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20 Nov 2021 13:14 #44306 by Aris Loumidis
Replied by Aris Loumidis on topic RADIATOR CAP RUST
Thanks for the suggestions guys, for now I put on grease to see how it works
Aris Loumidis
Athens, Greece
ACD Life Member
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1936 CORD 810 Phaeton

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  • Roads2run
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19 Nov 2021 10:53 #44303 by Roads2run
Replied by Roads2run on topic RADIATOR CAP RUST
Powder coating might help preserve an original cap. Tom Hartz
Roads2run

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  • johnmereness
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19 Nov 2021 00:20 #44301 by johnmereness
Replied by johnmereness on topic RADIATOR CAP RUST
Caps are VERY hard to find, so cherrish the next one in any way you can protect it.

You want the good old fashioned green antifreeze and you may want to read up on "oats" regarding antifreeze. I have been buying NAPA 50/50 for pre 1995 cars.

Also, NAPA carries a water pump lubricant that is the old fashioned white milky stuff - no harm in adding water pump lube to the antifreeze.

Keep in mind that there are frw places in the United States that are exempt from the periodic freezing temperatures and it does not take that long to freeze water.
JMM

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  • Thomas Wilcock
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18 Nov 2021 13:20 #44297 by Thomas Wilcock
Replied by Thomas Wilcock on topic RADIATOR CAP RUST
This is worth reading

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  • Aris Loumidis
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09 Oct 2021 14:51 #44045 by Aris Loumidis
Replied by Aris Loumidis on topic RADIATOR CAP RUST
Thanks Tim, great idea it's done!
Aris Loumidis
Athens, Greece
ACD Life Member
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1936 CORD 810 Phaeton

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  • Tim Gilmartin
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09 Oct 2021 13:25 #44043 by Tim Gilmartin
Replied by Tim Gilmartin on topic RADIATOR CAP RUST
I have been using grease on the underside of the radiator cap for several years. If grease has thinned, I just put another coat on. It has worked very well, and no new rust has appeared. I don’t want to overthink the problem. The rest of the radiator is just fine.
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  • Thomas Wilcock
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09 Oct 2021 11:12 #44042 by Thomas Wilcock
Replied by Thomas Wilcock on topic RADIATOR CAP RUST
I have heard of some cooling/heating system corrosion problems being caused by electrolysis and not acidity of coolant. This happens when the corroded item is not properly grounded. A voltmeter between the battery ground and coolant may show a very small voltage if electrolysis is happening.
Tom

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  • Terry Cockerell
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09 Oct 2021 01:13 #44039 by Terry Cockerell
Replied by Terry Cockerell on topic RADIATOR CAP RUST
Tim.
There must be an underlying problem to cause the corrosion on the underside of the radiator cap like Aris has experienced. The grease must wash off the cap over time exposing the metal again. The subject of corrosion inhibitors vs anti freeze coolants really opens up a large can of worms.
T cockerell

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  • Tim Gilmartin
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08 Oct 2021 14:35 #44038 by Tim Gilmartin
Replied by Tim Gilmartin on topic RADIATOR CAP RUST
I’m using store bought 50/50 mix of coolant and water. Working just fine for 25 years so far.
Tim.

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  • Terry Cockerell
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08 Oct 2021 04:59 #44035 by Terry Cockerell
Replied by Terry Cockerell on topic RADIATOR CAP RUST
Tim what sort of engine coolant do you use?
T cockerell

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  • Tim Gilmartin
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07 Oct 2021 21:56 #44032 by Tim Gilmartin
Replied by Tim Gilmartin on topic RADIATOR CAP RUST
Ari: I had the same problem. An easy fix: clean or sand blast the affected area until the rust is gone. Then apply a light coating of light grease onto the whole area. Done.
CORDially, Tim.
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  • Terry Cockerell
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06 Oct 2021 21:21 - 06 Oct 2021 21:25 #44017 by Terry Cockerell
Replied by Terry Cockerell on topic RADIATOR CAP RUST
Aris perhaps you should be using a corrosion inhibitor instead of antifreeze?
The corrosion is severe. I know it can get cold in Athens during winter however you Cord is stored in a garage. How cold does it get in the garage?
Antifreeze coolants as far as I am aware do not provide corrosion protection.
You need to do some more investigation on available engine coolants.
T cockerell
Last edit: 06 Oct 2021 21:25 by Terry Cockerell. Reason: Revising text

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  • Aris Loumidis
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06 Oct 2021 17:23 #44011 by Aris Loumidis
Replied by Aris Loumidis on topic RADIATOR CAP RUST
Hi Gary, yes I do, a very diluted one
Aris
Aris Loumidis
Athens, Greece
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1936 CORD 810 Phaeton

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  • 1748 S
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06 Oct 2021 14:02 #44010 by 1748 S
Replied by 1748 S on topic RADIATOR CAP RUST
Yes, This is the correct cap. Are you using any antifreeze?


Gary Parsons

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  • Aris Loumidis
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06 Oct 2021 09:16 #44009 by Aris Loumidis
RADIATOR CAP RUST was created by Aris Loumidis
Hi All!

Please confirm that the cap in the pic is the original one for us. I have replaced it at least twice but it is only a matter of time before it rusts badly away.

Are there any correct replacements? Or solutions like chroming or else?

Thanks Ahead
Aris

Aris Loumidis
Athens, Greece
ACD Life Member
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1936 CORD 810 Phaeton
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