239 Flathead Flush
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Mountain Pass
Joined: Nov 2017
Posts: 194
Likes: 2
From: Toronto, Canada
239 Flathead Flush
Can someone give me some advice.
Im installing a new CHAMPION 3 Row radiator on my 1951 ford F3 when I removed the origional one I noticed some old sludge on the 2 bottom outlets I wasn’t planning on getting my motor rebuild just yet. So my question is
what is the meat way to flush out all that old sludge before I put In my new radiator ?
Im installing a new CHAMPION 3 Row radiator on my 1951 ford F3 when I removed the origional one I noticed some old sludge on the 2 bottom outlets I wasn’t planning on getting my motor rebuild just yet. So my question is
what is the meat way to flush out all that old sludge before I put In my new radiator ?
Senior User
Joined: Apr 2018
Posts: 153
Likes: 0
From: Des Moines, IA
Can someone give me some advice.
Im installing a new CHAMPION 3 Row radiator on my 1951 ford F3 when I removed the origional one I noticed some old sludge on the 2 bottom outlets I wasn’t planning on getting my motor rebuild just yet. So my question is
what is the meat way to flush out all that old sludge before I put In my new radiator ?
Im installing a new CHAMPION 3 Row radiator on my 1951 ford F3 when I removed the origional one I noticed some old sludge on the 2 bottom outlets I wasn’t planning on getting my motor rebuild just yet. So my question is
what is the meat way to flush out all that old sludge before I put In my new radiator ?
Fleet Owner
Joined: Jul 2004
Posts: 27,297
Likes: 1,059
From: NM
The engines in all these old Fords are sloped to the rear, and the flat V8's don't have any drain ***** at the back of the block. So draining the coolant doesn't really drain the whole block.
If you can park the truck facing downhill safely (wheels chocked, in gear, e-brake on), it really helps to flush from each thermostat hole on the heads, with the lower radiator hoses off. That said, the sludge that builds up in the lower back of the block is famous for being hard to get out without having the heads off, but it's the best you can do.
If you can park the truck facing downhill safely (wheels chocked, in gear, e-brake on), it really helps to flush from each thermostat hole on the heads, with the lower radiator hoses off. That said, the sludge that builds up in the lower back of the block is famous for being hard to get out without having the heads off, but it's the best you can do.
Fleet Mechanic
Joined: Dec 2005
Posts: 1,603
Likes: 44
Be creative make a adaptor for the bottom hose for your garden hose maybe plastic with a tapped hole for shop
air. Run the water and short burst of air this is reverse flushing : watch out for years of junk comming out of the
head outlet. Same with radiator bottom hose and blast it. My bought new by my father 50 F6 now steaming and blowing its load caused from years and yrs of stop leak and whatever -block was half full of that junk. The
thought was stop leak for another days work. The engine back when, was Cody Ford Summerville Ma short block. still runs perfectly...
air. Run the water and short burst of air this is reverse flushing : watch out for years of junk comming out of the
head outlet. Same with radiator bottom hose and blast it. My bought new by my father 50 F6 now steaming and blowing its load caused from years and yrs of stop leak and whatever -block was half full of that junk. The
thought was stop leak for another days work. The engine back when, was Cody Ford Summerville Ma short block. still runs perfectly...
Cargo Master
Joined: Aug 2015
Posts: 2,075
Likes: 101
From: Marana, Arizona
BEFORE I changed my radiator, I flushed with straight phosphoric acid. Then pulled pumps, had engine on down hill slope and blasted with pressure washer. Also took out T stats and blew into heads. Looks like new inside and no overheating here in AZ. I posted all this up. Id do a link if I ever remember how.
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