MEP-802A/803A Coolant Servicing

[DieselAddict]

Pretty normal dissimilar metals type corrosion. Waterpump is a good guess on source.

I had one come through with some serious cooling system issues. The coolant had jelled.

I did a couple of plain water flushes then ran some cooling system cleaner through ti. When I rinsed it out, everything looked nice and shiny again. Refilled with green coolant and it was good to go.

 

[Sidis8]

With "new to me" equipment, you never quite know what happened. The MEP-803A was manufactured in '06, and the oil filter was changed last year at a little over 22 hours. So I drained the coolant, which looked ugly, green/orange and cloudy. (No photo) I got 5 quarts out, so I felt pretty good about it. I filled it up with distilled water, ran it until it warmed up, and let it cool.
View attachment 905809
Rinse #1 on the far right. That's five rinse/fills from the right to the left, with #4 missing (opaque container). Getting a little over 5Qts/rinse, so maybe a pint left at each rinse. I figure that the overflow holds a pint or so, so 5.9- 0.5qts is about 5.4qts for the rest of the system.

Any thoughts on what generates a whitish cloudy material? Water pump corrosion? (Aluminum hydroxide?)

All the best,

2Pbfeet

I used this to refill mine, worked like a charm. Little pricey but worth it. Pulls a vacuum and checks for leaks also.

https://www.amazon.com/gp/aw/d/B01BW39HJS?psc=1&ref=ppx_pop_mob_b_asin_title