The Ford Barn

Henry/Kokomo · 07-09-2013, 01:51 PM

Millcroft - Just an observation: The suggestion was made that there might be / probably was some core sand, rust scale and other debris in the block's water jacket. You replied that the block had been boiled out. I know from past experience that removing the remnants of casting sand, heavy scale, pattern wire etc. required physically scraping and digging to get it out. Hot tanking alone will not do the job. The last engine I had built was hot tanked. After that, I spent several hours picking and scraping inside the water passages and got about a 3# coffee can of debris out of the block. After I finished that, the engine builder put it through his baking and airless blast cleaner. A lot of work but it runs cool. Hope this helps.

07-09-2013, 01:51 PM	#17
Henry/Kokomo Senior Member Join Date: May 2010 Location: Kokomo, Indiana Posts: 1,731	Re: Overheating Flathead Millcroft - Just an observation: The suggestion was made that there might be / probably was some core sand, rust scale and other debris in the block's water jacket. You replied that the block had been boiled out. I know from past experience that removing the remnants of casting sand, heavy scale, pattern wire etc. required physically scraping and digging to get it out. Hot tanking alone will not do the job. The last engine I had built was hot tanked. After that, I spent several hours picking and scraping inside the water passages and got about a 3# coffee can of debris out of the block. After I finished that, the engine builder put it through his baking and airless blast cleaner. A lot of work but it runs cool. Hope this helps. __________________ Henry