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Old 09-28-2017, 12:34 AM   #1
wingski
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Default tillotson float valves

Hey guys, how do you lap an all metal float valve into a Tillotson carb. They’re a lot smaller than a regular valve, so I don’t have any idea of how to do it. Bill, suggested that I use a coarse toothpaste as a lapping compound, and I agree. I’ll use Pepsodent, but how is the question. Another thing, those things are supposed to be staked (tapped lightly so they seat in the carb), but is lapping required when you are going to stake an all metal valve?
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Old 09-28-2017, 08:08 AM   #2
marc hildebrant
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Default Re: tillotson float valves

I saw a note on my rebuild kit to stake the float valve, but nothing to lap the valve.
Did the instructions say to lap the valve seat ?

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Old 09-28-2017, 10:38 AM   #3
wingski
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Default Re: tillotson float valves

Marc, these carbs were leaking like mad, so I decided to start all over again as if they were new. I have no instructions, so it's a hit and miss situation. One of the Ford Barn members suggested that I lap the valves, and it sounded sensible.
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Old 09-28-2017, 11:24 AM   #4
redmodelt
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Default Re: tillotson float valves

Some of the modern made valves do not have a smooth finish. What they may have been suggesting is to polish the valve not the seat.
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Old 09-28-2017, 05:51 PM   #5
J Franklin
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Default Re: tillotson float valves

Lapping the valves usually pertains to the intake and exhaust valves. For the carb, first try to just tap the needle into the seat. Test to see if you can suck and hold vacuum by the valve. The soft metal will conform to the other.
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Old 09-28-2017, 06:54 PM   #6
Patrick L.
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Default Re: tillotson float valves

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Have you considered a Gross type valve ?
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Old 09-28-2017, 06:54 PM   #7
wingski
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Default Re: tillotson float valves

Thanks, guys. I've polished the valves with .004 steel wool and am getting ready to stake them in the carbs. I'll let you know how it turns out.
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Old 09-28-2017, 06:55 PM   #8
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Default Re: tillotson float valves

I might if I knew what it was.
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Old 09-28-2017, 07:42 PM   #9
Bruce of MN
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Default Re: tillotson float valves

http://www.ebay.com/itm/Model-A-Ford...-/111954756737

or

http://www.snydersantiqueauto.com/ti...pe-needle-seat
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