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Old 12-17-2019, 02:17 PM   #1
Mart
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Default Valve seats. How to remove?

Hi guys. how do you remove a valve seat assuming it can't be set up in a milling machine?

Can it be shrunk by welding on it? Can you weld on it? (I have MIG).

I do have a hand powered valve seat cutter but don't fancy trying to cut them out with that.

Any advice or pointers offered appreciated.

Mart.
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Old 12-17-2019, 02:34 PM   #2
19Fordy
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Default Re: Valve seats. How to remove?

Lots of info. here.
https://www.google.com/search?q=how+...hrome&ie=UTF-8
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Old 12-17-2019, 03:07 PM   #3
flatheadmurre
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Default Re: Valve seats. How to remove?

There are pullers more or less advanced.
The std bruteforce version https://goodson.com/products/valve-seat-pullers
Weld a washer and pull may or may not work depending on what material in seat...some stellites will weld some not...they get brittle and crack easy...
I have seats in oversize for replacing if you need...putting a std size back sometimes ends up loose.
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Old 12-17-2019, 06:59 PM   #4
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Default Re: Valve seats. How to remove?

Yes, a quick weld on the seat about as fast as possible. Ring will simply fall out. One word of caution---I once knew a guy to whom I explained my technique. Only too late he realized his block did not have seat rings. Ugly.
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Old 12-17-2019, 07:32 PM   #5
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Default Re: Valve seats. How to remove?

John's correct above here, that's exactly how we get them out also!

If we happen to have the block mounted on the Bridgeport for any other machining at that point we have the option of simply cutting the seats out with an end mill also.

Thanks, Gary in N.Y.

P.S. I'll also give you this, we generally find a +.005" will go right back in without any add'l machining, in other words once the original is removed it is simply a matter of pressing in the O/S replacement! This method has always worked for us here!
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Old 12-17-2019, 07:35 PM   #6
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Default Re: Valve seats. How to remove?

Thanks for the tips guys.

This will be another hoop for me to jump through.
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Old 12-17-2019, 07:59 PM   #7
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Default Re: Valve seats. How to remove?

Quote:
Originally Posted by Mart View Post
Hi guys. how do you remove a valve seat assuming it can't be set up in a milling machine?

Can it be shrunk by welding on it? Can you weld on it? (I have MIG).

I do have a hand powered valve seat cutter but don't fancy trying to cut them out with that.

Any advice or pointers offered appreciated.

Mart.


Mart what I do is use the tig torch and just weld on the seat without adding any filler rod at all the seats shrink a lot doing it this way. Very easy to do. Once the seats are out if you have an accurate way of measuring the bores for the seats in the block i think you will find there not round anymore. Now the next hoop in the project will need attention.
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Old 12-17-2019, 10:02 PM   #8
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Default Re: Valve seats. How to remove?

Tigs are like precise acetylene torches really. You can heat an area pretty quick without welding on low temps.


Guess that's why they say if you can gas weld you can tig. I can tig like the average bear but haven't learned gas welding. A skill I wish I had.
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Old 12-17-2019, 10:22 PM   #9
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Default Re: Valve seats. How to remove?

Tig works the best . Heat with 1/16th tungsten , quench , they fall out.
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Old 12-18-2019, 04:27 AM   #10
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Default Re: Valve seats. How to remove?

Thanks fellas. Unfortunately I'm limited to mig.

I do have arc and oxy acetylene, but for this job, of the options I do have, it will need to be mig.

Mart.
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Old 12-18-2019, 04:03 PM   #11
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Default Re: Valve seats. How to remove?

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Originally Posted by Mart View Post
Thanks fellas. Unfortunately I'm limited to mig.

I do have arc and oxy acetylene, but for this job, of the options I do have, it will need to be mig.

Mart.




Mart the mig will also work. Heck when i need to remove cylinder sleeves i run the mig up and down the sleeves and that works the sleeves shrink nicely so there easy to remove. Simple back yard Hot Rodding
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