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Old 10-20-2014, 10:04 PM   #1
Lee Mitch
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Default crack in block

I have 1,100 miles on my newly restored A. The engine was rebuilt by a professional builder but a crack in the front of the block has appeared. I am guessing that it was not magnafluxed. I have it in a climate conditioned shop. The crack is up and under the portion of the block that is the upper front flat part and is 3-4 inches long. Sorry I cannot describe the location better, but this location makes me think it is a water jacket to the exterior. This is a numbers matching, original engine. I would like to try something other than stitching, but will do that if necessary. It is so darn new, I hate pulling it already after less than a year.

I am thinking about cleaning out the crack and JB Weld for now. Do you suggest that I "pin" the ends of the crack with brass rod so that the crack doesn't run further?
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Old 10-20-2014, 10:11 PM   #2
Mike V. Florida
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Default Re: crack in block

"V" it out and use slow set JB Weld. The a block is not pressurized and the repair will last for years.
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Old 10-20-2014, 10:19 PM   #3
Drive Shaft Dave
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Default Re: crack in block

I like to drill a small hole at each end, J. B . Weld. As Mike said.
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Old 10-20-2014, 10:23 PM   #4
Lee Mitch
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Default Re: crack in block

Mike- no brass rod?
Dave- drill hole and put brass rod or JB weld in it?

Thanks fellas!
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Old 10-20-2014, 10:44 PM   #5
Drive Shaft Dave
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Default Re: crack in block

Do like Mike V says and vee it out and use the slow set J.B.Weld. Drilling a hole at each end of the crack will keep the crack from spreading.
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Old 10-20-2014, 11:05 PM   #6
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Default Re: crack in block

Lee Mitch,

Is this the area that you are saying is cracked on your block?

Darryl in Fairbanks
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Old 10-20-2014, 11:06 PM   #7
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Default Re: crack in block

Hey Lee,
Before you go 'drilling/mudding', I'd show pics of situation here, so something more settled can be said about how to... Your description lets the imagination loose to make maybe bad call/prognosis !
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Old 10-20-2014, 11:24 PM   #8
Lee Mitch
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Default Re: crack in block

Yep Darryl, that's the spot and about the length. Brass fix on yours?
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Old 10-20-2014, 11:34 PM   #9
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Default Re: crack in block

Lee,

Yes, this is a B engine that I repaired about Thirty years ago with 11 solid 1/8" brass pipe plugs. Most people today recommend using Steel or Iron and a Stitch method.

I have never had any trouble and run this engine to this day.

Darryl in Fairbanks
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Old 10-20-2014, 11:41 PM   #10
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Default Re: crack in block

common location when antifreeze is overlooked
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Old 10-21-2014, 01:49 AM   #11
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Default Re: crack in block

Quote:
Originally Posted by darrylkmc View Post
Lee,

Yes, this is a B engine that I repaired about Thirty years ago with 11 solid 1/8" brass pipe plugs. Most people today recommend using Steel or Iron and a Stitch method.

I have never had any trouble and run this engine to this day.

Darryl in Fairbanks
The old dykes manual called out the use of threaded brass rod, threaded in place, trimmed to within 1/8", then peened over.
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Old 10-21-2014, 02:07 AM   #12
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Default Re: crack in block

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Originally Posted by Mike V. Florida View Post
The old dykes manual called out the use of threaded brass rod, threaded in place, trimmed to within 1/8", then peened over.
Hi Mike,

I couldn't find Fine Thread Brass Rod, so I settled on Solid Brass 1/8" plugs, plus it is a tapered thread, overlapped 50% on each, start from both ends and work towards the middle. I ground near flush and center punched each to set it.

Had a Dykes Manual and a hardware store close.

Darryl in Fairbanks
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Old 10-21-2014, 02:41 AM   #13
Mike V. Florida
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Default Re: crack in block

Quote:
Originally Posted by darrylkmc View Post
Hi Mike,

I couldn't find Fine Thread Brass Rod, so I settled on Solid Brass 1/8" plugs, plus it is a tapered thread, overlapped 50% on each, start from both ends and work towards the middle. I ground near flush and center punched each to set it.

Had a Dykes Manual and a hardware store close.

Darryl in Fairbanks
Those old guys sure knew their stuff!!
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Old 10-21-2014, 04:03 AM   #14
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Default Re: crack in block

If it were mine, I'd put in a jar of the regular old BARS-LEAKS & later on, clean the area & paint over it & FORGET about it!! I've seen amazing results, using this product, & freeze cracks were sealed up "indefinitely"!
I feel that drilling, tapping, driving in pins, etc, "might" cause the crack to GROW!
Bill W.
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Old 10-21-2014, 04:59 AM   #15
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Default Re: crack in block

Just do like Mike V says and you will forget it is there. Take your time and make sure you get it sealed when you apply the JB Weld.
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Old 10-21-2014, 07:08 AM   #16
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Default Re: crack in block

AND,let that professional know he rebuilt a cracked block!!
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Old 10-21-2014, 07:43 AM   #17
Tom Wesenberg
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Default Re: crack in block

Is it leaking?

Can you tell for sure it' a crack, and not a mold line?

If the block was stripped clean during the rebuild, I'd think a crack there would have been easily seen.
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Old 10-21-2014, 09:39 AM   #18
Lee Mitch
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Default Re: crack in block

Yes, it is leaking. That is how I found the crack. Thanks everyone. Where would I be without the fellas on Fordbarn....
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Old 10-21-2014, 03:05 PM   #19
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Default Re: crack in block

If you use J.B. weld mix up a small batch about the size of a quarter. Wait 20 minutes and mix up another batch that you will use to make the repair. Keep testing the first batch to see when it starts to set up. Then you know when to put the fix it batch on. Keeps you from having to fuss with it to keep it from running down the front of the block. You can also put some masking tape over the J.B. weld when you fill the crack.
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Old 10-21-2014, 03:21 PM   #20
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Default Re: crack in block

Quote:
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Yes, it is leaking. That is how I found the crack. Thanks everyone. Where would I be without the fellas on Fordbarn....
There is also a lot of experience in your local club!
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