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06-04-2018, 10:32 PM | #21 |
Member
Join Date: May 2010
Posts: 88
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Re: Cracked Block Options
My Model A also has a crack in this area. It is not as large as yours, but it is in the exact same place. In most cases this is caused by freezing. In my experiences, it is not uncommon to find cracks in this area. Another area that is well known for cracking is directly under the water pump.
I would not consider brazing or welding to be an option for making a repair with a crack like this. I say this because the cast iron in this area is usually quite thin. Applying heat to thin cast iron may result in larger problems than you have now. I have used JB Weld to repair the crack in my Model A block. I used a small Dremel tool to clean the area around the crack. I drilled several very small holes on both sides of the crack. These holes were used to press the JB Weld into, so the epoxy would have something to anchor to. I also drilled a small hole at each end of the crack to prevent spreading. Before applying the JB Weld I cleaned the area with acetone. I used the “slow” curing JB Weld rather than the quick setting type. I applied two thin coats. After the epoxy partially set up to a tacky stage I pressed a piece of 80 grit sandpaper into the tacky epoxy to give it the look and texture of cast iron. After the epoxy completely dried, I applied a coat of paint to the area using a small brush. This repair has lasted several years without a failure. I hope your luck is as good as mine. Last edited by Ed; 06-11-2018 at 07:06 AM. |
06-04-2018, 11:06 PM | #22 |
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Join Date: Sep 2010
Location: Danville, CA
Posts: 1,554
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Re: Cracked Block Options
In 1998 our club did the repair tent at the Reno meet. A guy came in with much the same crack you show but it was so bad the pieces had fallen out. I believe it was three pieces. When I first saw it the side of the engine looked as though it were breathing. Perceptible movement in and out, So I was alarmed and told him we had sold all the engines we had on hand. He assured me he didn't want anything but to change his oil and then be on his way to Alaska the following morning, with Bill Lancaster and a couple of others. The block was held together with JB Weld and he made it up and back though he didn't follow Lancaster to the last 1000 miles to get above the Arctic Circle. Bill assured me the car had performed admirably the whole trip to Alaska and back.
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06-05-2018, 08:35 AM | #23 |
Member
Join Date: Sep 2014
Posts: 51
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Re: Cracked Block Options
Thanks everyone for the advice and tips. I'll give JB weld my best shot then see how it goes. That's a cool story about the A going to Alaska with a "breathing" block. Thanks again everyone.
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06-05-2018, 08:47 AM | #24 |
Member
Join Date: Sep 2014
Posts: 51
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Re: Cracked Block Options
Another Question, what tool gave you the best results grinding on the block? dremel, angle grinder, 1/4" die grinder. I imagine the die grinder would have the best control/power.
Is there a stone or bur style bit that worked well for you? Thanks Again |
06-05-2018, 10:53 AM | #25 |
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Join Date: Dec 2011
Location: SW Idaho
Posts: 970
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Re: Cracked Block Options
I'm with George Miller; use tapered iron plugs. Iron-Tite and their ceramic sealer.
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06-05-2018, 09:57 PM | #26 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Cracked Block Options
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I just sandblasted and coated with JB Weld. https://www.fordbarn.com/forum/showt...+engine&page=3 |
06-06-2018, 11:12 AM | #27 |
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Join Date: May 2010
Location: 60615,330th Ave.,Clare, Iowa, 50524
Posts: 1,457
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Re: Cracked Block Options
With a crack like that, there is a big chance you have others.
Herm. |
06-06-2018, 12:45 PM | #28 |
Member
Join Date: Sep 2014
Posts: 51
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Re: Cracked Block Options
Tom that one cool doghouse. Thanks for the info.
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06-06-2018, 12:55 PM | #29 |
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Join Date: May 2010
Posts: 2,598
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Re: Cracked Block Options
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Last edited by Benson; 06-07-2018 at 06:05 PM. |
06-06-2018, 02:25 PM | #30 |
Member
Join Date: May 2010
Posts: 70
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Re: Cracked Block Options
JB weld is best option. Use duct tape to hold in place while setting up
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06-06-2018, 08:40 PM | #31 |
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Join Date: Oct 2014
Location: Santa Cruz Ca.
Posts: 175
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Re: Cracked Block Options
I have Brazed many blocks like this.............
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06-07-2018, 01:33 AM | #32 |
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Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,354
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Re: Cracked Block Options
Forget the crack. If I understand you correctly, oil is not draining out of the pan correctly/slowly. Pull the pan , manifolds and valve cover plug the main and cam oil tubes and clean all the sludge. You can drop the pan upside down on cement, and the dipper tray will come out. There’s a good chance your oil pump screen is severely plugged as well. You might want to check bearing clearences as well. Now you know what shape your engine is, and its clean, go ahead on the crack. Otherwise if sludged up, you’ll have a short drive.
New engines are $4000 or so.its worth the precautions! |
06-07-2018, 02:18 AM | #33 |
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Join Date: Apr 2011
Location: South pacific island
Posts: 1,724
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Re: Cracked Block Options
Cleaning oil pans is a good idea if you don't know the condition very well.
Just drill the ends of the cracks, JB weld and lock&stich it when it gets rebuilt.
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<Link> This is how we roll<Link> "I'm Convinced that no one really reads posts anymore; they just fabricate what they think the post says then ramble on about red herrings."--Bob Outcasts rules of old cars #1 Fun is imperative, mainstream is overrated #2 If they think it is impossible, prove them wrong #3 If the science says it impossible you are not being creative enough. #4 No shame in recreating something you never had #5 If it were not for the law & physics you would be unstoppable |
06-07-2018, 10:19 AM | #34 | |
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Join Date: May 2010
Location: now Kuna, Idaho
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Re: Cracked Block Options
Quote:
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06-07-2018, 10:15 PM | #35 |
Member
Join Date: May 2010
Posts: 75
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Re: Cracked Block Options
I would suggest that you get some Marine Tex, sort of J.B. Weld on steroids. Back in ,my commercial fishing days I had a friend who had an engine crack , in his boat, in order to get in he sealed it up with Marine Tex. Made it back---4-5 years later it was still going strong.
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06-08-2018, 12:42 PM | #36 | |
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Join Date: Dec 2016
Location: Sunrise Beach, Mo
Posts: 439
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Re: Cracked Block Options
Quote:
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06-14-2018, 08:41 PM | #37 |
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Join Date: Jul 2017
Location: SoCal
Posts: 53
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Re: Cracked Block Options
Like others, the JB weld will work, but first drain, drill ends, remove paint/ Drexel tool grind area, degrease with alcohol or brake cleaner. I patched holes in ‘58 Harley heads and it stayed good for over a decade.
+ on dropping oil pan. I just did mine. PO said he religiously maintained after engine rebuild, but there was 3/8 sludge in pan. Yes, take the cover off the pump to clean the screen and assembly. Best of luck. |
06-14-2018, 08:59 PM | #38 |
Junior Member
Join Date: Jan 2018
Location: Alabama
Posts: 28
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Re: Cracked Block Options
Another endorsement for the JB Weld. I repaired a Ford 8n tractor block 20 years ago and its still good.
I've also had good luck with Bar's leak tablets. Randall |
06-14-2018, 10:20 PM | #39 |
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Location: Sacramento
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Re: Cracked Block Options
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06-18-2018, 08:19 AM | #40 |
Member
Join Date: Sep 2014
Posts: 51
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Re: Cracked Block Options
Thanks all for the help, I drilled the ends, used a dremmel to grind out the crack a tad, cleaned with wire wheel in a die grinder, then lacquer thinner. Finnaly filling with JB weld.
Using a single sided razer as a putty knife/scraper worked great to apply the JB weld. I tried the shop vac trick and connected it on the water inlet but it kept sucking the JB weld clean through the holes so they wouldn't stay plugged. I've driven it ~ 20 miles since the patch and no leak yet so I'm keeping my fingers crossed and moved on to the next problem. Thanks Again. |
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