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11-23-2021, 08:13 PM | #1 |
Senior Member
Join Date: Sep 2010
Posts: 153
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Flathead valve seat question
I'm trying to understand ...I found a guy to repair the 1 valve seal seat with an oversize valve seat. My valve seat came loose and landed around the valve stem. What causes that ? No cracks around seat that I can see motor wasn't sized. Is that a common thing to happen? Would it necessarily mean others could free up ? Thanks
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11-23-2021, 10:49 PM | #2 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,408
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Re: Flathead valve seat question
Quote:
Should be .006 for cast iron. Others could loosen if not installed properly. Installed right, they will last forever. |
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11-24-2021, 11:34 PM | #3 |
Senior Member
Join Date: May 2010
Posts: 2,484
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Re: Flathead valve seat question
WE used to freeze the seats and heat the block. With white lead lube they would drop in sizzle a bit and were forever. Newc
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11-25-2021, 04:51 AM | #4 |
Senior Member
Join Date: Jun 2020
Location: Germany
Posts: 204
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Re: Flathead valve seat question
On my motorcycle cylinderheads I use a simple formula: 1/275 oversize on iron heads , 1/250 on aluminum heads. To make sure the seat is falling into the recess I do the same as Newc
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11-25-2021, 05:38 AM | #5 |
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Join Date: May 2010
Location: South Australia
Posts: 50
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Re: Flathead valve seat question
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