rust in coolant tank 6bta370

[Pete Griffin]

I found light rust in my coolant tank,under the fill/cap lip,the best way to clean? And is there a recommended coolant?(looks like green auto coolant in tank) I have done the after cooler w/ sbmar kit,fuel cooler delete kit,will look at my heat exchanger today.Thanks for any input.

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[Zac Schramm]

Glad you found only light rust, I had the same issue.  Spent the last couple of months cleaning everything up.  I suggest if you take anything apart considering flushing the rusty coolant BEFORE taking the engine apart, that way you don’t end up with rusty water staining everything.

If it’s only light rust I would just flush it till it’s clean a few times (cummins manual says use baking soda) and then fill it with coolant and run it.  Maybe change the coolant again in 6 months.

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Pete Griffin

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