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Head flatness tolerance

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Winfield Dave
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Head flatness tolerance

Postby Winfield Dave » Thu Sep 04, 2014 9:47 am

A good friend (a mechanic) is working on a Cub for a guy and he thinks the head is warped.
He asked me what the tolerance is for this.
I searched thru all the manuals I have, as well as the Forum, and could not find anything.

What is the tolerance?
Thanks for your help.
Dave
"More gold has been mined from the thoughts of men than has been taken from the earth." -- Napoleon Hill
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Eugene
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Re: Head flatness tolerance

Postby Eugene » Thu Sep 04, 2014 10:21 am

.002" to .003" length of the head. Close to .003" or above, consider shaving the head.
I have an excuse. CRS.
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ShineOn
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Re: Head flatness tolerance

Postby ShineOn » Thu Sep 04, 2014 10:50 am

Good to know . Thanks Eugene .
The Constitution established a Government in Trust . Go from there .
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Winfield Dave
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Re: Head flatness tolerance

Postby Winfield Dave » Thu Sep 04, 2014 11:08 am

Eugene wrote:.002" to .003" length of the head. Close to .003" or above, consider shaving the head.
Thanks for the quick response Eugene. :D
Is this listed in any of our manuals, or simply from generally accepted machine shop practices / experience?
Dave
"More gold has been mined from the thoughts of men than has been taken from the earth." -- Napoleon Hill
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Eugene
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Re: Head flatness tolerance

Postby Eugene » Thu Sep 04, 2014 11:43 am

Winfield Dave wrote:Is this listed in any of our manuals, or simply from generally accepted machine shop practices / experience?
Some of the above. Actually a double check with an internet search.

Consider that the head gasket will crush to conform to the head. Also, the head is not 100% rigid, expands and contracts with temperature changes. After engine start up the head is retorqued. Retorquing will help even out any minor head distortions.
I have an excuse. CRS.
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Winfield Dave
10+ Years
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Posts: 3560
Joined: Thu Apr 22, 2010 2:31 pm
Zip Code: 17953
Tractors Owned: ......Almost enough.
N3NIK
Circle of Safety: Y
Location: PA, Middleport (Schuylkill County)

Re: Head flatness tolerance

Postby Winfield Dave » Thu Sep 04, 2014 5:39 pm

Thanks Eugene !! :D
Dave
"More gold has been mined from the thoughts of men than has been taken from the earth." -- Napoleon Hill
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