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Jul 21st, 2025 | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Made a long post about this already but it didn't seem to get through or was pulled for word choices. (I cleaned it up just in case.)
Here's a much shorter version.
Problem:sludge in water jacket prevented water from coming out.
After I removed the radiator hoses, I removed block drain petcock and threaded in a male air compressor quick connect into the block (same thread as it works out), and put the compressor's air hose to it and blew the clog free half way across the shop via the disconnected radiator hoses.
I removed the air hose from the connector and water drained freely and unobstructed out of the block like you know what.
Last edited by 52Carl; 09/12/2024 9:15 PM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Dec 2012 Posts: 121 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 121 | Had a similar problem with a 235 ci block. After soaking overnight in a hot tank it was still clogged. Took some stiff wire and kept digging around through the drain hole, inserted a short length of brake line hooked to a compressor to dig and blow it free. Just kept repeating with water flowing in it until we were satisfied. Another task requiring some patience.
Greg | | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Update.
After blowing a clog free from the black drain with my air compressor with the radiator hoses removed, I have since removed the water pump and stuck the business end of the hot pressure washer wand into each of the water pump holes in the block, I was able to blow out an incredible amount of very dark water out through the block drain hole.
Tipping the wand up and down did a very thorough job of flushing out both sides of the block without removing anything but the water pump and the block drain pet cock. After a good long while, the water finally ran clear.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Go one step further and remove the intake/exhaust manifold assembly and the freeze plugs on the driver's side of the block. Then pressure wash between the cylinders with the high pressure wand pointed toward the bottom of the water jacket. Wear a rain suit and a face shield- - - -the blowback will be epic. Replace the pressed-in freeze plugs with the rubber expansion type.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | I might as well. I am in the middle of the process of cleaning the block to get it ready for paint. I haven't removed the manifolds yet because I don't want any water inside the engine. I do plan of replacing all of the freeze plugs once I remove the manifolds.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Several layers of Gorilla Tape across the ports will keep water, dirt, and mice out of the engine.
Jerry
Last edited by Phak1; 09/17/2024 2:25 AM. Reason: Spelling
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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