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11-06-2023, 09:32 PM | #1 |
Junior Member
Join Date: May 2020
Posts: 14
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1940 Flathead - Question Re Lifter Tolerances
Hi All, I have a question I am hoping someone can help me with. A friend of mine is in the process of rebuilding a 1940 flathead engine which, as originally built, did not have any adjustment for the valves. The current tolerance (I hope I am using the right word) is 5/1000 but the manual we have says it should be 12-13/1000. Is 5/1000 correct? Or should we install lifters that allow for some adjustment? Thanks for your help.
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11-06-2023, 09:44 PM | #2 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,272
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Re: 1940 Flathead - Question Re Lifter Tolerances
Valves should be intake .010 - 012 intake and .014- .016 exhaust. Grind the ends of the valve stems to get the correct clearance.
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11-07-2023, 02:50 PM | #3 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,423
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Re: 1940 Flathead - Question Re Lifter Tolerances
Quote:
Eutectic 16FC rod applied with a torch to the end of the valve stem. You can also TIG weld 347 stainless rod on. |
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11-07-2023, 04:59 PM | #4 |
Senior Member
Join Date: Sep 2013
Location: Dighton, Mass
Posts: 1,230
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Re: 1940 Flathead - Question Re Lifter Tolerances
tig or mig has been done by some to decrease clearance proper way is reface the valve 45 decrease, either way suppose ok but still have to remove valve.
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11-07-2023, 10:43 PM | #5 |
Senior Member
Join Date: May 2010
Location: Wa.
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Re: 1940 Flathead - Question Re Lifter Tolerances
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