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Tom Wesenberg · 12-30-2016, 01:10 AM

Lots of people used to use plain water, which created lots of rust, which likes to settle in the lowest place in the block, which is around the rear two cylinders. When you drive at high speed the added speed of the coolant flow will churn up the rust that settled in the rear of the block. The same thing happened to me when I drove faster than 45 for a 60 miles run on the highway.

I wound up removing the radiator, turning it upside down in a large tub of water, and connecting a sump pump to the radiator to back flush it. I then connected the sump pump to the block to flush that out also. With the pump running I also started the engine and revved it up to create some vibration to help dislodge any junk in the cooling chamber.

Here's a link to my thread on the subject, and it has pictures of the sump pump.

https://www.fordbarn.com/forum/showth...ump+pump+flush

12-30-2016, 01:10 AM	#3
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: rust in water Lots of people used to use plain water, which created lots of rust, which likes to settle in the lowest place in the block, which is around the rear two cylinders. When you drive at high speed the added speed of the coolant flow will churn up the rust that settled in the rear of the block. The same thing happened to me when I drove faster than 45 for a 60 miles run on the highway. I wound up removing the radiator, turning it upside down in a large tub of water, and connecting a sump pump to the radiator to back flush it. I then connected the sump pump to the block to flush that out also. With the pump running I also started the engine and revved it up to create some vibration to help dislodge any junk in the cooling chamber. Here's a link to my thread on the subject, and it has pictures of the sump pump. https://www.fordbarn.com/forum/showth...ump+pump+flush Last edited by Tom Wesenberg; 12-30-2016 at 01:19 AM.