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EFV-8 Club Forum / General Ford Discussion / Are these block cracks repairable?

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Discussion Topic: Are these block cracks repairable?

Don

01-03-2014 @ 8:00 AM

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This is a 40 Merc block, are these cracks worth while to repair ??
What would be the cost and who can do it?
I also have a LB block with some simular cracks.
Hope the pics show
Thanks Don

TomO

01-03-2014 @ 9:25 AM

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1940 Mercury blocks are hard to find, so if you have one and need a block, they should be repaired. The machinist will have to stitch the deck area and sleeve the cylinder. The cost will depend upon the shop labor rate in your area.

Did you measure the bore? It looks as if that was a steel sleeved block and that the sleeves have been pulled. If so all of the cylinders should be sleeved again. The cylinder walls in most of those blocks are thin and will not hold up without the sleeves.

Tom

supereal

01-03-2014 @ 12:55 PM

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I agree with Tom. We repair blocks at our shop by drilling and pinning the crack area. The photo appears to show the crack running down into the cylinder wall. In that case, sleeving may be the only choice.

This message was edited by supereal on 1-3-14 @ 12:57 PM

supereal

01-03-2014 @ 12:59 PM

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Here is a page showing how the block is repaired at our shop:

shogun1940

01-04-2014 @ 4:42 PM

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very nice engine repairs,, I noticed you did not drill right up to the holes, is that standard procedure ? Do you use a drill press or a hand drill ?

supereal

01-04-2014 @ 7:30 PM

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Each job is different because of the location of the cracks. In old Ford blocks, the most common are in the valve pockets. Before we undertake the repair, we boil the block and MagnaFlux it to reveal cracks that are not visible. The pins are threaded in, then the surface is restored. Cracks that extend into the cylinder wall may extend to the water jacket, and can't be reliably fixed. The photos are of my son's work. He is famous here for his ability to restore engines.

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