Where'd the water come from?

[Strecker25]

So I've winterized our boats forever, never had a problem, usually used -50 pink. We're in western NY so it gets plenty cold.

For some reason I couldn't remember if I pulled the big hose from the water pump side this year (twin 350's) to dump that water that gets trapped in the bend. So, I grabbed 4 more gallons of AF (West only had -100, so I'm REALLY protected now) to re-do the job.

Here's the kicker. I had used -60 this year, which is a pretty dark purple. I pulled the block plug on the one motor and out comes very very pale purple water. I collected some in a cup to be sure, and this stuff was basically clear. Somehow the 2-3 gallons of AF I put into the motor got completely diluted.

I drained both blocks for a second time, poked the holes with a zip tie, and refilled with the -100. I'm pretty confident in this job now that I've done it twice, but where did that water come from?! I've heard the intake manifold will hold some, and maybe the water pump hose if I forgot to empty it, but the water was extremely diluted. Just very surprising I guess. Interested to hear what you guys think

 

[Soul Mate II]

Good morning, I went through something similar a few years ago. I was using 3-4 gallons in each engine. I run fresh water until I get to operating temperature and in all end up using closer to 7-8 gallons of non tox. You might say it's over kill but I got a much deeper pink when I pulled the hose. For an extra $16 - it helps me sleep at night. Good luck. I never used the -100 - you must sleep terrific!

 

[Strecker25]

Yup, just weird. I'm pretty sure a 5.7L block holds about 2 gallons of liquid. I added 2 gallons the first go around, So I assumed it was empty to start but they must have had some water left in them.

Sure glad I checked! I'll go back in a day or two and drain a few ounces to see if it's diluted again

 

[Maximus]

Did you drain the block before you ran the non tox through it the first time? And are you sure both sides were completely drained? After I drain block I start engine and pump 5 gallons in at sea water pump. That fills block and heads first with the pink stuff then the manifolds and out the exhaust. And I don’t run engine first to warm them up. No point you’re just circulating water that you’re about to drain out so what’s the point