The Ford Barn

bosstime2 · 03-15-2025, 03:02 PM

Do these look right after lapping?

Hitman · 03-15-2025, 03:14 PM

Those look okay for a hand lapping job. In the first picture, where we see your foot, the lapped area has a ring in t. I’d keep going until that ring is gone.

How are the valve seats? The valve is only 50% of the equation, the seats are the other 50%. The seat face needs to be just as clean as the valve face.

noboD · 03-15-2025, 06:43 PM

Second one looks too wide to me.

bosstime2 · 03-15-2025, 07:30 PM

Two of the seats don’t look shiny yet….i guess I’ll go a bit more on these. Thanks for the insight

Big hammer · 03-15-2025, 08:06 PM

Shiny does not seal as well as the graying you have in your pictures, I found this out when I was working in an aircraft engine shop 50 years ago

oldspert · 03-15-2025, 10:35 PM

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Years ago when I had just bought my first Model A, an old timer (then because I was 15 years old) told me to lap the valves then mark the seat with a pencil lead. If the mark disappeared when you spin the valve, it was perfect.
Ed

03-15-2025, 03:14 PM	#2
Hitman Senior Member Join Date: Sep 2014 Posts: 822	Re: Valve lapping Those look okay for a hand lapping job. In the first picture, where we see your foot, the lapped area has a ring in t. I’d keep going until that ring is gone. How are the valve seats? The valve is only 50% of the equation, the seats are the other 50%. The seat face needs to be just as clean as the valve face.

03-15-2025, 06:43 PM	#3
noboD Senior Member Join Date: May 2010 Posts: 370	Re: Valve lapping Second one looks too wide to me.

03-15-2025, 07:30 PM	#4
bosstime2 Member Join Date: Jul 2014 Location: Chicopee, MA Posts: 60	Re: Valve lapping Two of the seats don’t look shiny yet….i guess I’ll go a bit more on these. Thanks for the insight __________________ 1929 Open Cab Pickup 1930 Standard Roadster 1936 Buick Special Trunk Back Sedan

03-15-2025, 08:06 PM	#5
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,431	Re: Valve lapping Shiny does not seal as well as the graying you have in your pictures, I found this out when I was working in an aircraft engine shop 50 years ago __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

03-15-2025, 10:35 PM	#6
oldspert Senior Member Join Date: Aug 2012 Location: Texas Posts: 392	Re: Valve lapping Sponsored Links (Register now to hide all advertisements) Years ago when I had just bought my first Model A, an old timer (then because I was 15 years old) told me to lap the valves then mark the seat with a pencil lead. If the mark disappeared when you spin the valve, it was perfect. Ed