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Old 03-19-2020, 01:54 PM   #111
jclark138
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Default Re: Damaged cylinder head

From the scratches on the pistons, my guess is something more than aluminum was present. There doesn’t look to be any trace of galling which usually shows to some extent when aluminum and aluminum are “rubbed” hard together. I’d likely clean the piston up ( lightly buff with scotch bright- type product) and so long as dimensions are good I’d use it. But that’s me -
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Old 03-19-2020, 05:37 PM   #112
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Default Re: Damaged cylinder head

Something I learned recently.

When it's 25 oversized.... it really means "point twenty five mm"....so that's less than one thousandths of an inch.
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Old 03-19-2020, 05:54 PM   #113
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Default Re: Damaged cylinder head

Since you already have it apart...see what the numbers match up. Thousands make a difference.
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Old 03-19-2020, 07:26 PM   #114
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Default Re: Damaged cylinder head

http://products.jacobsen.com/img/manuals/27615-g01.pdf

See if this works.
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Old 03-20-2020, 12:10 PM   #115
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Default Re: Damaged cylinder head

Quote:
Originally Posted by Blind Old Coot View Post
Hey Coot. That's the manual I used to rebuild but I clearly skipped some important steps in my haste to get it done. I'm a bonehead. Lesson learned.
Looks like I will need some new tools as well.
I do not have a micrometer or a telescoping gauge set. YET!!! LOL I'll be shopping today. [emoji16]
Bet they aren't cheap. I'll be using the pistons as well, I'm waiting on a another crankcase to arrive, I've got a new set of rings for both pistons, crank seals and gasket kit, and a new head gasket. I'm ready to go! I'll be completely going by the manual this time. I won't skip steps this time.

Thank you everyone. Always appreciate the advice.

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Old 03-20-2020, 12:24 PM   #116
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Default Re: Damaged cylinder head

Quote:
Originally Posted by Blind Old Coot View Post
Something I learned recently.

When it's 25 oversized.... it really means "point twenty five mm"....so that's less than one thousandths of an inch.
.25mm = .00984in. Pret near .010 over.
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Old 03-20-2020, 04:54 PM   #117
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Default Re: Damaged cylinder head

JClark,
Math mistake duly noted. I had one too many zeros while transferring measurements. Don't want to mislead anyone trying to rebuild a motor , just know it was a challenge for me when trying to do this. Glad I did any happy that BGW was there to help me.
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Old 03-20-2020, 06:15 PM   #118
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Default Re: Damaged cylinder head

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Originally Posted by Blind Old Coot View Post
JClark,
Math mistake duly noted. I had one too many zeros while transferring measurements. Don't want to mislead anyone trying to rebuild a motor , just know it was a challenge for me when trying to do this. Glad I did any happy that BGW was there to help me.
Oh yeah - Blind Old Coot, there’s a whole lot I wouldn’t have tried, and much I wouldn’t have had succeeded at without this group ! Very much appreciated! : :
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