Grinding Valves

Rfarms

Member
Ground The Valves On A 8n With split valve Guides. Valves & seat Ground to 45 Degrees. Valves don't seem To seat right. Can Put Talcum Powder On top of valve & Blow Air Thru valve port & blow Powder Off around Valve. Have Valve Adjusted To 12 intake &16 Exhaust. Wondering If valve Shoulder is hitting top of valve Guide?.have more Adjustment left On Valve adjusters. Don't Have a valve lapper.Thanks in Advance
 
(quoted from post at 10:31:12 03/23/15) Ground The Valves On A 8n With split valve Guides. Valves & seat Ground to 45 Degrees. Valves don't seem To seat right. Can Put Talcum Powder On top of valve & Blow Air Thru valve port & blow Powder Off around Valve. Have Valve Adjusted To 12 intake &16 Exhaust. Wondering If valve Shoulder is hitting top of valve Guide?.have more Adjustment left On Valve adjusters. Don't Have a valve lapper.Thanks in Advance

Your valve springs hold about 60 psi so 120 psi of air may have enough force to open the valve ? They seal in the pressure but not out . 1 of 100 possibilities .

Pour a cap full of gasoline on top and see if it runs down the valve .
 
(quoted from post at 11:31:12 03/23/15) Ground The Valves On A 8n With split valve Guides. Valves & seat Ground to 45 Degrees. Valves don't seem To seat right. Can Put Talcum Powder On top of valve & Blow Air Thru valve port & blow Powder Off around Valve. Have Valve Adjusted To 12 intake &16 Exhaust. Wondering If valve Shoulder is hitting top of valve Guide?.have more Adjustment left On Valve adjusters. Don't Have a valve lapper.Thanks in Advance

If you want to check the fit of the valves and seats:
  • [*:ccba6c44bd]Go to NAPA and purchase a tube of Prussian blue[*:ccba6c44bd]Paint the seats with a super thin coating of the blue[*:ccba6c44bd]Drop the valves into the seats and rotate them slightly while applying light pressure to the head of the valve.[*:ccba6c44bd]Remove the valves and observe the contact pattern[/list:eek::ccba6c44bd]If it doesn't look a lot like this fire your valve grinding shop.

    TOH

    IMG_47841.jpg
 
What you are saying does not make sense to me. You say split valve guides, and then you say valve adjusters. Are you saying you have split guides and normal valves and not the tulip stems?
 
(quoted from post at 13:03:04 03/23/15) What you are saying does not make sense to me. You say split valve guides, and then you say valve adjusters. Are you saying you have split guides and normal valves and not the tulip stems?

I do not see a reason you could not run split guides and straight valves ? Isn't the diameter the same ?
 
(quoted from post at 06:29:25 03/24/15)
(quoted from post at 13:03:04 03/23/15) What you are saying does not make sense to me. You say split valve guides, and then you say valve adjusters. Are you saying you have split guides and normal valves and not the tulip stems?

I do not see a reason you could not run split guides and straight valves ? Isn't the diameter the same ?

Could be, it just stuck me strange.
 
TheOldHokie,Applying light pressure using your thump on the head.Now that came out funny,what is that round circle on your forehead with the word Ford backwards in the middle?LoL
 
(quoted from post at 19:10:44 03/23/15) TheOldHokie,Applying light pressure using your thump on the head.Now that came out funny,what is that round circle on your forehead with the word Ford backwards in the middle?LoL

It's Ash Wednesday old Ford tractor style ;-) I cleaned up the wording to make it read a bit better.....

TOH
 
If you don't want to go out and buy a tube of Prussian Blue, make a series of pencil marks with a #2 pencil, put the valve in place, and turn it and the marks will be smeared to show the valve seat width just like the Prussian Blue.

Lest this sound like a crackpot idea, Cummins Engines has showed this method in some truck engine shop manuals for YEARS.

<img src = "http://automotiveenginemechanics.tpub.com/TM-5-2815-241-34P/img/TM-5-2815-241-34P_229_1.jpg">
 
(quoted from post at 01:54:12 03/24/15) If you don't want to go out and buy a tube of Prussian Blue, make a series of pencil marks with a #2 pencil, put the valve in place, and turn it and the marks will be smeared to show the valve seat width just like the Prussian Blue.

Lest this sound like a crackpot idea, Cummins Engines has showed this method in some truck engine shop manuals for YEARS.

I'm told felt markers also work well. And neither leaves the can't get it off your hands, clothes, parts, or tools mess the Prussian Blue makes. The stuff seems to travel through thin air ;-)

TOH
 
(quoted from post at 00:54:12 03/24/15) If you don't want to go out and buy a tube of Prussian Blue, make a series of pencil marks with a #2 pencil, put the valve in place, and turn it and the marks will be smeared to show the valve seat width just like the Prussian Blue.

Lest this sound like a crackpot idea, Cummins Engines has showed this method in some truck engine shop manuals for YEARS.

&lt;img src = "http://automotiveenginemechanics.tpub.com/TM-5-2815-241-34P/img/TM-5-2815-241-34P_229_1.jpg"&gt;

I would add to check the valve and seat contact for 360 degrees . If you have a low spot on the seat but lap the valve wildly or use a drill , you would get a false positive on the valve .

Best to do a simple test with a spoon full of gas to check for a seal . The valve train is the heart of a motor .
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top