Yama F100 Clean water chambers on block

[groveboy]

Head is removed and there are lots of deposits in water chambers on block. Can't clean with brush, openings too narrow. Want to specifically clean areas due to internal coating failure and paint with zinc chromate paint.
Also noticed a couple areas that have heavy corrosion to cylinder walls.
What can I use to dissolve deposits clean enough to paint? Looking at some type of "aluma brite products.

[TownsendsFJR1300]

A stainless steel "toothbrush" works well once you scrape off the heavy stuff. If your very careful, a Dremel with a small sanding roll will work.

Take your time, it IS time consuming.

This thread, Rydlyme is used with decent results.

http://www.yamahaoutboardparts.com/f...g-th19434.html

[groveboy]

A stainless steel "toothbrush" works well once you scrape off the heavy stuff. If your very careful, a Dremel with a small sanding roll will work.

Take your time, it IS time consuming.

This thread, Rydlyme is used with decent results.

http://www.yamahaoutboardparts.com/f...g-th19434.html

thanks will check thread