Cooling system sealants...

[RhynoCZ]

Has anyone ever successfully used one of those ''pour into the cooling system'' sealants?

I have a small leak in my car's cooling system and it's too cold for me to work on it at the moment. The radiator has a wet spot on it, so I think a small stone or previous owner damaged the radiator and as it gets colded outside, the leak got present/noticeable. I already cleaned the whole engine to deremin, where the leak is comming from and I'm 99.9% sure it's the radiator.

Q: I have here a Sonax cooling system sealant, that you pour into the coolant (into the expansion tank, in my case), so...
1) Will this feck up the engine?
2) Will it just do nothing?
3) Will it work?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Rogerborg]

[RhynoCZ]

Well, poured it in. I had to take the hose from the head to the radiator off and pour it there, as they say it's supposed to go directly into the radiator. Had a hour drive in the car, now we'll wait. For obivous reason, when the engine is hot, there's no leak. It's the cooling down, that opens the little cracks.

Thanks Roger,
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stinkwheel]

Even cracking a raw egg into the radiator works. Seen it done.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Howling TerrorOutOfOffice]

^^^Just the egg white...can get smelly if you add the yolk.
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[Polarbear]

I used radweld on a Mk1 Goldwing many years ago

No problems.
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Victory Cross Country American tractor.

[RhynoCZ]

[-]

K-Seal works. Turn the heater to cold whilst it sets though or it will block the heater matrix and render the heating useless.

I was told it was named as K seal as Rover K series owners used to lob it in to help future failures. Probably cobblers and seems to contain copper particles, which I blamed for grinding the plastic end of an auxiliary coolant pump on my ex's E34 Beemer. Lots of copper grit found in the knackered pump and the nornal magnetic driven plastic pump had worn through.
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[RhynoCZ]

Read above, already done.

Also, the manual said specifically to turn the heater on, as it seals the heater core as well. Let's hope I did not feck up the engine.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stevo as b4]

Tbh if a manufacturer of expensive performance engines is using a plastic water pump impeller and pump body housing too, they are simply not worth buying their products, as you'd have to think what other engine and ancillary parts are they scrimping on?

I used K-seal as a very short term temporary part fix on a Rover K-series engine once. But it has very mixed reputation and results, and is probably better suited as a gasket and leak sealant on a simpler dimensionally stable engine that has fewer potential ways of failure.

[RhynoCZ]

And so far, it still leaks.

A new radiator it is, then.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[DrSnoosnoo]

[RhynoCZ]

Yes Doctor, but wouldn't the egg mess up the whole cooling system as well as the radiator? All the hoses, lines, the head, cylinders, coolant pump...?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stevo as b4]

A new cheap rad from your local factors, maybe two hoses if they look perished, and an hours work on the drive will have the job done.

You love old Merc's so it would be silly to kill one seeing as they generally go on forever with the occasional service. Sadly they still can't cool the engine without water, I'm not sure any manufacturer has perfected this feat either.

Good job you ain't got a K-series in your benz, lose a pint:lose an engine is a fair and accurate motto for these.

[DrSnoosnoo]

[tom_e]

[stevo as b4]

I thought it was obvious we were talking about modern car engines though? I didn't explicitly specify though so the twat hat is on me if that makes you feel a little bit better inside?

[tom_e]

It does thank you