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03-24-2015, 07:53 PM | #1 |
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Location: Camino, CA.
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B block cracked
I have a B block that's cracked under one or two of the insert valve seats. Is there a permanent fix for this problem, or should I just get a boat and chain. I believe there's usually a fix for everything.
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03-24-2015, 08:20 PM | #2 |
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Re: B block cracked
I recall seeing a video that I believe cracks around the valve seats is one of the worst areas for cracks. I'd wait to hear from an engine rebuild pro for sure....
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-Mike Late 31' Ford Model A Tudor, Miss Daisy I don't work on cars --I'm learning about my Model A. Cleveland, Ohio Last edited by mshmodela; 03-24-2015 at 08:28 PM. |
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03-24-2015, 08:24 PM | #3 |
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Re: B block cracked
B engines are notorious for cracking in that area and it is made worse by putting valve inserts in. I NEVER put them in either an A or B engine. They are simply not needed and lead to the early demise of the block. Bad move, this was always going to happen once the inserts were put in.
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03-24-2015, 09:22 PM | #4 |
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Re: B block cracked
It CAN be welded. Don't junk it.
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03-24-2015, 10:42 PM | #5 |
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Re: B block cracked
They can be "stitched". There was a post here a short while ago I believe that showed the repairs to an A block if several places. Was it from J&M in Mass?
I found it!! https://www.fordbarn.com/forum/showpo...8&postcount=17
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What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II Last edited by Mike V. Florida; 03-24-2015 at 10:51 PM. |
03-25-2015, 01:43 AM | #6 | |
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Re: B block cracked
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Quote:
Yes, that type crack in those type areas can be fixed. Finding the right person with the right skills is the hardest part. And, IMO, and experience, hardened valve seats can and should be put right back in after proper fix is made. Helps to prevent recurrence of cracks. |
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03-25-2015, 02:39 AM | #7 |
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Re: B block cracked
Hi Glenn
Cracks under the seat insert can be repaired but IMO these are among the hardest to repair inserts are a interference fit and if fitted to tight the repair can reopen to loose and the insert comes loose BTW which way does the crack travel down into the port or up into the deck as that would change how you might go about the repair Do not junk it and let us how you get on with it Colin |
03-25-2015, 08:20 AM | #8 | |
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Re: B block cracked
Quote:
I have posted this picture a few times in the forum but it's worth reposting to save a valuable block. It's a common occurence on Model A/B engines to crack in center exhaust seats due to heat. Since you're in California I would find a machine shop capable of metal stitching. If not; a trip to Lock n Stitch in Turlock,CA would suffice for a reliable repair. http://www.jandm-machine.com/metalStitching.html |
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03-25-2015, 03:18 PM | #9 |
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Re: B block cracked
J and M, impressive... given your experience, what might be an example of a crack that is beyond Lock and Stitch repair?
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-Mike Late 31' Ford Model A Tudor, Miss Daisy I don't work on cars --I'm learning about my Model A. Cleveland, Ohio |
03-25-2015, 07:01 PM | #10 |
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Re: B block cracked
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03-25-2015, 08:25 PM | #11 |
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Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
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Re: B block cracked
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03-25-2015, 08:53 PM | #12 |
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Re: B block cracked
"The only way this block would be a boat anchor is If you take it to the wrong machine shop and they weld it."
Ah yes, but you don't take welding job to a machine shop any more than you would have a carpenter do brain surgery on you. A cast iron welding and repair shop is the place to go. Anything that is cast iron can be welded and put back to new condition or better. Stitching is usually the best ECONOMICAL way to go for the problems described above. Give me a couple years and you will see what can be done to a "B" block by cutting it 4 ways and welding it together to take a desmodromic head among other things. |
03-27-2015, 04:12 PM | #13 | |
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Re: B block cracked
Quote:
Just had a thought ! IF you do not want a B block with cracks, maybe you can work with an A block with no cracks..guaranteed ! I have a striped A block that I will not be using and you have a B block that you may not be using...see what I'm saying...win/win , eh |
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