GRINDING VALVES 1952 8N TRACTOR

HIVEY · Oct 22, 2014

I AM READY TO REGRIND THE VALVES ON MY 8N INDUSTIAL ENGINE.MY QUESTION IS SHOULD I OR CAN I PUT IN THE VALVE GUILDES TO GET A TRUE SEAT ON THE VALVES AND SHOULD I PUT LUBE OIL ON THE STEMS OF THE VALVES SO THERE IS NO METAL TO METAL CONTACK IN THE GUILDES.I ALSO REMOVED THE ADJUSTABLE TAPPETS TO DRILL THE HOLES FOR HOLDING THE TAPPETS FOR ADJUSTING.I WATCHED VIDEOS BUT NONE SHOWED REMOVEING OR LEAVING IN THE GUILDS.JUST THE GRINDING PART.

TheOldHokie · Oct 22, 2014

(quoted from post at 09:25:47 10/22/14) I AM READY TO REGRIND THE VALVES ON MY 8N INDUSTIAL ENGINE.MY QUESTION IS SHOULD I OR CAN I PUT IN THE VALVE GUILDES TO GET A TRUE SEAT ON THE VALVES AND SHOULD I PUT LUBE OIL ON THE STEMS OF THE VALVES SO THERE IS NO METAL TO METAL CONTACK IN THE GUILDES.I ALSO REMOVED THE ADJUSTABLE TAPPETS TO DRILL THE HOLES FOR HOLDING THE TAPPETS FOR ADJUSTING.I WATCHED VIDEOS BUT NONE SHOWED REMOVEING OR LEAVING IN THE GUILDS.JUST THE GRINDING PART.

The valve guides are the reference cylinder for the seat geometry. If using a real valve grinder it would have a pilot arbor that fits the bore in the guides. That pilot is what keeps the stone square and centered against the seat. Without it the seat would come out cocked and teh valve would not seal When lapping valves into the seat the stem of the valve acts as the pilot.

TOH

Bob · Oct 22, 2014

Here's how it was done "back in the day"...

<img src = "http://www.gondtc.com/~blweltin/Bob/SeatGrinder.jpg">

R Geiger · Oct 22, 2014

Valves are ground on a separate machine off the engine, seats are ground as TOH, and Bob says. Valves are lapped to the seats with the guide in place using valve lapping compound!

tractorguy2 · Oct 22, 2014

Dad has a grinder for the Fords very close to this one.

HIVEY · Oct 22, 2014

OK MAYBE I SHOULD HAVE SAID LAPPING THE VALVES IN PLACE NOT GRINDING. SO IT IS OK TO LEAVE THE VALVE GUIDE IN PLACE ,BUT DO I NEED TO LUBE THEM.

TheOldHokie · Oct 22, 2014

(quoted from post at 12:41:20 10/22/14) OK MAYBE I SHOULD HAVE SAID LAPPING THE VALVES IN PLACE NOT GRINDING. SO IT IS OK TO LEAVE THE VALVE GUIDE IN PLACE ,BUT DO I NEED TO LUBE THEM.

No.

TOH

Bob · Oct 22, 2014

Do your self a favor, at this point and have them professionally ground.

TheOldHokie · Oct 22, 2014

(quoted from post at 15:10:56 10/22/14) Do your self a favor, at this point and have them professionally ground.

Plus 1 on that - valves and seats. It's well worth the modest cost.

TOH

GRINDING VALVES 1952 8N TRACTOR

HIVEY

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TheOldHokie

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Bob

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R Geiger

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tractorguy2

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HIVEY

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TheOldHokie

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Bob

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TheOldHokie

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