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| | | | Joined: Sep 2021 Posts: 34 'Bolter | | 'Bolter Joined: Sep 2021 Posts: 34 | Finally got my 46 pickup running after replacing 4 push rods and found that I have a cracked block. Any suggestions on a fix.
Thank you. | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Where is the crack? If the 46 is running the original cooling system, it will have a "zero pressure" radiator. That means a crack repair shouldn't have to seal any pressure. I'd suggest an aggressive cleanup of the block surface such s sandblasting or bead blasting, drilling a small hole at both ends of the crack, grinding a shallow "V" and using Marine-Tex to cover it. To give the patch the proper "cast iron" surface texture, press a piece of 40 grit sandpaper over the patch as it cures.
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: Oct 2019 Posts: 131 'Bolter | | 'Bolter Joined: Oct 2019 Posts: 131 | How deep should you drill the holes? | | | | | Joined: Oct 2019 Posts: 131 'Bolter | | 'Bolter Joined: Oct 2019 Posts: 131 | | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Find the ends of the crack and drill a 1/8" or smaller hole all the way through to prevent the crack from continuing to spread. We also used to use overlapping threaded tapered cast iron plugs for crack repair, a process called "sewing". The plugs and the tapered taps for installing them are available on Ebay.
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: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | One done with Marine Tex as Jerry suggested. Shows crack that was fixed 20 years ago and no issues even though it runs through freeze plug holes. Sand blasted, roughed up with 24 grit disc and crack "V" grooved about 1/16 deep. Use Marine Tex as it was designed for liquid rather than other epoxies like JB Weld. Sorry no finished pics. Used rubber expandable freeze plugs. [img]https://i.postimg.cc/1f8zZyQ2/40-Pontiac-engineand-trans-002.jpg[/img]
Evan
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