Originally Posted by Simi 60
What's all that other brown gunge?
Almost looks like incompatable coolants?
If memory is correct itís a salt
crust, and staining of the bronze
. The salt
build up may be due to the restricted water
flow and maybe the raw water
flow getting hot enough to deposit salt, which if it was, ought to be self cleaning
with higher water flow and cooler water.
What your looking at is the heat exchanger
cap. So no coolant
is ever present here, just raw water
When I bought the boat
it had Dexcool in it, which is correct IAW Yanmar
, but had some rust, so I installed the Prestone flush kit and flushed it repeatedly until just fresh water came out, then used just plain ole Green Prestone.
Then Dec. of last year I flushed it again throughly and used Zerex HOAT coolant
While I have never had any trouble with Dexcool, apparently many others have so I decided to avoid it. I donít need or want long life coolant, it was brought to my attention that due to the possibility of salt water
contamination, that we should flush and refill more often and donít need long life coolant.