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01-26-2020, 12:39 PM | #21 |
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,066
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Re: Exhaust port crack.... need help!
Ursus, I would pin it, IF there is enough thickness for the pin to bite into.
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01-26-2020, 12:45 PM | #22 |
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Join Date: Sep 2019
Location: Chicago Burbs
Posts: 46
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Re: Exhaust port crack.... need help!
Thank you to you all that replied, here is my situation. I planned on investing a couple bucks into this motor with cam, head, intake, carb etc, to warm it up a bit. I had a gut feeling do to the antifreeze in my exhaust header that there was a problem... So in a sense this is a blessing in disguise... Id love to find a good motor somewhat local to build. I rather not stress this one out anymore, to me I only see some of these other cracks spreading to areas that will be unable to be stitched.
I am goin to try an experiment, I guess it will be informative for all of us! I picked up a jar of this JB High Temp paste. I etched the surface and applied the product. it says it hold to 2400degs. So ill give it a couple days, blend it in the the cast and resemble the motor back to its stock forum. I will them run the motor on an off for maybe a couple hours and pull of the exhaust manifold and inspect the area. If it is good then reassemble and run it to inspect it down the road, if its bad then i will be looking for a good A block to build up. Or who knows.... id like to have a car to putt around this cruise night season.. I will keep you all informed with the turnout, thank you to all that replied. Matt Last edited by Matts30coupe; 01-26-2020 at 12:58 PM. |
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01-26-2020, 01:02 PM | #23 |
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Join Date: Sep 2019
Location: Chicago Burbs
Posts: 46
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Re: Exhaust port crack.... need help!
Here are some pictures
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01-26-2020, 01:43 PM | #24 |
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Join Date: May 2010
Location: Southern Maine
Posts: 1,492
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Re: Exhaust port crack.... need help!
Wow, that's an interesting product. I need to get out more. :-)
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01-26-2020, 03:16 PM | #25 |
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Join Date: Sep 2019
Location: Chicago Burbs
Posts: 46
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Re: Exhaust port crack.... need help!
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01-26-2020, 06:45 PM | #26 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,367
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Re: Exhaust port crack.... need help!
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01-27-2020, 11:01 AM | #27 |
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Join Date: May 2010
Location: Southern Maine
Posts: 1,492
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Re: Exhaust port crack.... need help!
No one seems to mention brazing anymore, it is a great way to repair cast iron and used to be common practice. I've had good luck with it in the past.
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01-27-2020, 12:50 PM | #28 | |
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Join Date: May 2010
Location: Santee, California
Posts: 3,505
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Re: Exhaust port crack.... need help!
Quote:
After applying the solder, immediately peen it, then with a low flame control the cooling down rate, and you will greatly reduce the chance of a cooling crack. You just have to get the feel for the temperature control. |
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01-27-2020, 02:18 PM | #29 | |
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Join Date: Jul 2014
Location: Fairbanks, Alaska
Posts: 126
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Re: Exhaust port crack.... need help!
Quote:
I have a B engine with the same problem, gave it about 3 doses of "Stop Leak" from NAPA, don't remember the brand. Stopped it completely, no leakage in almost 5 years. Worth a try and easy. |
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01-27-2020, 06:10 PM | #30 | |
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Join Date: Oct 2010
Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
Posts: 352
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Re: Exhaust port crack.... need help!
Quote:
I would be weary of brazing a Model A as the iron is an uneven thickness and you will end up doing more damage than the initial crack you're trying to repair. The pictures I have posted represent a brazing job on cylinder head from the Navy base in Richmond, a submarine welder I was told. i peeled it off like old gum. |
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01-28-2020, 10:02 AM | #31 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,367
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Re: Exhaust port crack.... need help!
Welding and soldering are two different procedures. If a part is cleaned properly and a good flux is used, silver or brass will stick but old engine parts made of cast iron are very porous and hard to clean. The water jacket spaces around the exhaust pockets were one of the things that Ford engineers (Harold Hicks) and pattern makers had to improve upon in the initial development of the model A engine. The model B engine castings may have been even more thin in this area.
I've brazed up cast iron cylinders and heads for the early Harley Davidson motorcycle engines and never had problems but they are air cooled. When coolant or ethylene glycol has saturated the iron castings, it's almost as bad as oil to get it clean. An engine block would have to be cleaned very well inside and out to get a solder to fill into the porous substrate properly. The ideal way to repair it would be fusion welding with cast iron but it wouldn't be cheap. Inside the exhaust pocket, it wouldn't be easy either. |
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