The Ford Barn

Dennis Pereira · 07-19-2010, 05:34 PM

This is a Diamond Block with a little flaw or is this a Big weld? I never noticed this till I rolled the engine out in the sun.

Bill Goddard · 07-19-2010, 06:50 PM

I think it is the parting line between the two halves of the casting mold (cope and drag). Maybe the area was touched up with a grinder.

deuce295 · 07-19-2010, 06:51 PM

I have several diamond A blocks and each one has really pronounced seams, casting lines and marks. The standard A blocks I have are a much smoother casting. Not sure if it was because the diamond was more often used in an industrial type application and not finished as smoothly or if the casting process was somehow different on the diamond blocks. Just my experience but what I have seen the diamond blocks are like that. I actually used a little jb weld to smooth out some of the flaws on the diamond I just had rebuilt.

Walt Dupont--Me. · 07-19-2010, 06:53 PM

I think you'll find it's a casting flaw, I do alot of A engines and about all of them have that funny casting. Walt

1931 flamingo · 07-20-2010, 08:02 AM

Might be able to tell if you removed the paint?
Paul in CT

MikeK · 07-20-2010, 08:51 AM

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Neither weld nor flaw. Looks like prints from two hollow unperfed sheet metal chaplets used to hold the lower part of the cylinder core aligned in the green sand mold. (Chaplets are sheet iron supports that dissolve in the cast iron pour.) Later production (diamond era) core changes made to produce a thinner casting in the upper area may have necessitated use of the chaplets when setting a glued core assembly. Typical and customary practice, not a defect unless surface finish is spec'ed.

This illustration shows chaplets in a vertical configuration. They are also used for horizontal alignment.

1930artdeco · 07-20-2010, 01:18 PM

Just curious...what is a diamond block?

Mike

Mike V. Florida · 07-20-2010, 04:27 PM

Quote:

Originally Posted by 1930artdeco

Just curious...what is a diamond block?

Mike

Check here http://www.fordgarage.com/pages/diamondblock.htm

07-19-2010, 06:50 PM	#2
Bill Goddard Senior Member Join Date: May 2010 Location: Shrewsbury,Pa Posts: 513	Re: Casting flaw? I think it is the parting line between the two halves of the casting mold (cope and drag). Maybe the area was touched up with a grinder.

07-19-2010, 06:51 PM	#3
deuce295 Member Join Date: May 2010 Location: Appleton, Wisconsin Posts: 58	Re: Casting flaw? I have several diamond A blocks and each one has really pronounced seams, casting lines and marks. The standard A blocks I have are a much smoother casting. Not sure if it was because the diamond was more often used in an industrial type application and not finished as smoothly or if the casting process was somehow different on the diamond blocks. Just my experience but what I have seen the diamond blocks are like that. I actually used a little jb weld to smooth out some of the flaws on the diamond I just had rebuilt.

07-19-2010, 06:53 PM	#4
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Casting flaw? I think you'll find it's a casting flaw, I do alot of A engines and about all of them have that funny casting. Walt

07-20-2010, 08:02 AM	#5
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,389	Re: Casting flaw? Might be able to tell if you removed the paint? Paul in CT

07-20-2010, 08:51 AM	#6
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: Casting flaw? Sponsored Links (Register now to hide all advertisements) Neither weld nor flaw. Looks like prints from two hollow unperfed sheet metal chaplets used to hold the lower part of the cylinder core aligned in the green sand mold. (Chaplets are sheet iron supports that dissolve in the cast iron pour.) Later production (diamond era) core changes made to produce a thinner casting in the upper area may have necessitated use of the chaplets when setting a glued core assembly. Typical and customary practice, not a defect unless surface finish is spec'ed. This illustration shows chaplets in a vertical configuration. They are also used for horizontal alignment.

07-20-2010, 01:18 PM	#7
1930artdeco Senior Member Join Date: May 2010 Location: Lynden, Wa Posts: 3,550	Re: Casting flaw? Just curious...what is a diamond block? Mike __________________ 1930 TownSedan (Briggs) 1957 Country Sedan