mysterious black cube coolant sealer

steptoe · Post by **steptoe** » Fri Feb 07, 2014 8:50 pm

Some may recall me using a mysterious little black block of rubbery sort of stuff , smells a bit like soap, designed to be crumbled up and run in the cooling system of some pretty serious leaks. My EA82T turned into a steam engine, and was same after head service and OEM gaskets

Hindsight says it must have been the turbo or not the heads and gasket.

I was issued with a little black cube, given instructions to run engine hotter than normal, so carded up the radiator completely, and saw regular 100C and one off 109C - just as the steam stopped.

TOONGA may remember ...... I had a pic and thread, but canna find it !

I finally found a reference to this miraculous stuff that comes in a box of maybe 24 or 32, marked not for individual sale, probably due to labeling laws etc. Not some US sourced stuff either

http://forums.autosport.com/topic/10120 ... ild/page-3

post #146 down near the bottom

Post by **TOONGA** » Sat Feb 08, 2014 9:08 am

Yes I remember it was nearly 2 years ago (amazing I can remember that far back)

I'm not sure I want to go through around 2000 of my posts to find the thread. (glad it isn't 10000)

I remember finding the black cubes here in WA, I used one in my brumby but it didn't cure a leaking headgasket

TOONGA

Silverbullet · Post by **Silverbullet** » Sat Feb 08, 2014 10:05 am

All you have to use is google

http://www.ebay.com.au/itm/SEALWEL-COOL ... 1053916016

Can't figure this stuff out, I always thought stop leak type stuff was a bad idea but this one seems different. Cleans and lubricates the cooling system as it seals?

And posts in the forum Jonno linked seem to swear by it for new engines even.

steptoe · Post by **steptoe** » Sat Feb 08, 2014 10:22 am

Well, there you go ! Nice find Sam.Twenty eight cubes - lifetime supply. The guy that gave me mine to try first watched it seal a crack in something like a VL Commodore where they tend to crack above #8 near a cam bearing, just watched as engine temp was brought up, coolant trickled out and crack slowly sealed up from one end to the other.

Something about compression on one side of a water leak, don't think anything can fix them except a new gasket. Can't help think a few used car yards might have thios stuff on hand....

nncoolg · Post by **nncoolg** » Sun Feb 09, 2014 7:59 pm

Holden sell a 'conditioner tablet' for the buick v6's to be put in the system everytime its flushed to stop leaks.