On the weekend I replaced my radiator hoses on my Skyline, since they were very crunchy, and I thought the rubber was hard.
As it turns out, there was a layer of rust , around 1/2 mm* caked onto the inside, and the crunchy sound was the rust cracking when you squeezed the hose.

As part of my coolant flush, I got some radiator treatment that breaks down rust into "small molecules" over the course of a few days, so I'm going to use that for a week with just water, then drain that out and use 50/50 antifreeze.

I was just wondering if anyone knew of a better way?

Are there places that can hook a sand blaster type of machine up to your block, blast it, then blow out the sand?

* 1/2 mm is around the size of the edges of the message boxes on H-T.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ryanstev &raquo;</TD></TR><TR><TD CLASS="quote">... As part of my coolant flush, I got some radiator treatment that breaks down rust into "small molecules" over the course of a few days, so I'm going to use that for a week with just water, then drain that out and use 50/50 antifreeze...</TD></TR></TABLE>Does the instructions for that stuff say NOT to use it with antifreeze? If not, I'd be afraid to do it that way. I bet during those few days, you can create a lot more rust. I'd use at least SOME antifreeze in order to get the anti-corrosion package.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">Does the instructions for that stuff say NOT to use it with antifreeze? If not, I'd be afraid to do it that way. I bet during those few days, you can create a lot more rust. I'd use at least SOME antifreeze in order to get the anti-corrosion package.
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It doesn't say, but it's only a week and I doubt there would be much extra rust in such a short time.

 

I believe those motors use an iron block? Golden Eagle recommends with their iron sleeves to use Bar's Stop Leak mixed in with the coolant to help prevent the coolant from rusting up the sleeves.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by badCRX &raquo;</TD></TR><TR><TD CLASS="quote">I believe those motors use an iron block? Golden Eagle recommends with their iron sleeves to use Bar's Stop Leak mixed in with the coolant to help prevent the coolant from rusting up the sleeves.</TD></TR></TABLE>

Yes, but it's only going to be one week with just water and the treatment.
The treatment eats rust, so it would probably prevent rust from forming in that short amount of time anyway.