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Cracked block

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Loyd

07-30-2002 18:21:14




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What is the best way to fix a block cracked on the outside? Will JB Weld hold? I can braze it but don't want to take a chance on warping it. Any suggestions?

Thanks




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MARK SWENSON

08-26-2002 14:56:24




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
I JUST REPAIRED A EXTERNAL CRACK ON A 1938 F20.
I USED A PRODUCT CALLED MARINE-TEX WICH IS AVAILABE AT ANY MARINE DEALER. GET THE GREY. I GROUND THE BLOCK SO THE AREA THAT I APPLIED THE PRODUCT WAS A CLEAN CUT AND ALSO USED A PUNCH TO PEEN THE GROUND SURFACE FOR EXTRA HOLD. I CANT TELL YOU HOW IMPRESSED I AM WITH TE RESULTS. THIS STUFF HARDENS LIKE STEEL YET YOU CAN GRIND IT DOWN AND CLEAN IT TO A POINT YOU WILL NEVER KNOW THE BLOCK WAS CRACKED. PAINT OVER IT AND SHE LOOKS LIKE A FACTORY BLOCK AGAIN. AND THIS CRACK WAS A GOOD 6 INCHES LONG

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MARK SWENSON

08-26-2002 14:56:10




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
I JUST REPAIRED A EXTERNAL CRACK ON A 1938 F20.
I USED A PRODUCT CALLED MARINE-TEX WICH IS AVAILABE AT ANY MARINE DEALER. GET THE GREY. I GROUND THE BLOCK SO THE AREA THAT I APPLIED THE PRODUCT WAS A CLEAN CUT AND ALSO USED A PUNCH TO PEEN THE GROUND SURFACE FOR EXTRA HOLD. I CANT TELL YOU HOW IMPRESSED I AM WITH TE RESULTS. THIS STUFF HARDENS LIKE STEEL YET YOU CAN GRIND IT DOWN AND CLEAN IT TO A POINT YOU WILL NEVER KNOW THE BLOCK WAS CRACKED. PAINT OVER IT AND SHE LOOKS LIKE A FACTORY BLOCK AGAIN. AND THIS CRACK WAS A GOOD 6 INCHES LONG

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MARK SWENSON

08-26-2002 14:55:53




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
I JUST REPAIRED A EXTERNAL CRACK ON A 1938 F20.
I USED A PRODUCT CALLED MARINE-TEX WICH IS AVAILABE AT ANY MARINE DEALER. GET THE GREY. I GROUND THE BLOCK SO THE AREA THAT I APPLIED THE PRODUCT WAS A CLEAN CUT AND ALSO USED A PUNCH TO PEEN THE GROUND SURFACE FOR EXTRA HOLD. I CANT TELL YOU HOW IMPRESSED I AM WITH TE RESULTS. THIS STUFF HARDENS LIKE STEEL YET YOU CAN GRIND IT DOWN AND CLEAN IT TO A POINT YOU WILL NEVER KNOW THE BLOCK WAS CRACKED. PAINT OVER IT AND SHE LOOKS LIKE A FACTORY BLOCK AGAIN. AND THIS CRACK WAS A GOOD 6 INCHES LONG

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Dennis Benson

08-21-2002 17:39:22




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
When you drill a hole at each end you will have to find the end, they can extend for 1/2 inch or so beyound what is visible. If you can't take the block to a shop for checking, you can check it with an electromagnet placed across the crack, turn on the magnet, the space under the magnet will have to have some room under it so that you can sprinkle a fine powdered iron over the crack, the powdered iron will be drawn to the crack and will stand up along the crack. the rest will blow away.

The shop I used to work in used tapered plugs overlapping each other for the length of the crack, but this wasn't good for long cracks.

Dennis Benson

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Steve U.S. Alloys

08-02-2002 05:35:40




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
Hello Loyd,
I've had some experience over the years working with many shops who repair engine components. A lot has to do with the physical size of the block. Small 4 cyl. blocks are much easier to braze or spray weld w/o preheat and precautionery steps.

When I read your post you mentioned the block was cracked on the outside. It would be important to terminate the crack as Jake mentioned....but...it is also important to know that there are often times cracks that run out from the edges of the crack you can see. Those cracks are undetectable to the eye. The only way to elimante them is to grind the visible crack completely through. This is common procedure in cylinder head repair for instance. The repair is then made by starting at one end and filling completely as you go.

It is also important to grind the transition zone clean so the edges of the deposited material will bond to the substrate in the transition area.
Cordially,
Steve

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Alton

07-30-2002 19:08:27




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 Re: Cracked block in reply to Loyd, 07-30-2002 18:21:14  
Depends on how the block is cracked but I have brazed several blocks and they held up. JB Weld should hold on a small crack that did't move with the heat.



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jake

08-02-2002 03:59:38




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 Re: Re: Cracked block in reply to Alton, 07-30-2002 19:08:27  
Don't forget to drill a hole at each end of the crack to keep it from going further.



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