Valve Seat

[Bob in Tennessee]

My 8N has suffered from a coolant leakage for some time because of a broken block and it has degraded my valve seat chamber to the point that the seat has separated from the block. Is this a repairable
situation considering the cost of a used block and parts and machine work would be more than the value of the tractor itself? Is is possible to re-seat a seat into this block in the current condition?
What would you guys do? It is a front mount 1949 8N 12Volt conversion with front mount EI. Ran great until this issue even with the broken block. The corner of the block broke when I drilled out and re-tapped
a head bolt after the original stud bolt broke off during removal. Never could get it to close properly. Obviously the engine that came with the tractor when I bought it thirty years ago was from a 2N.

 

[DN-N-TN]

I'd be more concerned about the damage to the block than the seat. The seat repair would be no problem to a good machinist. If it were me, I'd be looking for a cheap, ragged 8N or 9N with a descent engine. I don't know where you live in TN, but R&R Tractor, Madisonville, TN. has many junked out old Fords, where you could pick up a used engine.

 

[TheOldHokie]

(quoted from post at 10:01:20 12/20/21) My 8N has suffered from a coolant leakage for some time because of a broken block and it has degraded my valve seat chamber to the point that the seat has separated from the block. Is this a repairable
situation considering the cost of a used block and parts and machine work would be more than the value of the tractor itself? Is is possible to re-seat a seat into this block in the current condition?
What would you guys do? It is a front mount 1949 8N 12Volt conversion with front mount EI. Ran great until this issue even with the broken block. The corner of the block broke when I drilled out and re-tapped
a head bolt after the original stud bolt broke off during removal. Never could get it to close properly. Obviously the engine that came with the tractor when I bought it thirty years ago was from a 2N.
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto111493.jpg>

<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto111494.jpg>

<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto111495.jpg>

I am not sure what I am looking at in those pictures but if that gap is as big as it looks I don't think there is enough room between the valves to install a new seat that large. I think a replacement block is needed.

TOH

 

[Bob in Tennessee]

The first picture is the seat sitting on top of seat bore. It came loose. I should have removed it for clarity. The second picture is fuzzy but it is seat bore without seat.

 

[TheOldHokie]

(quoted from post at 16:42:29 12/20/21) The first picture is the seat sitting on top of seat bore. It came loose. I should have removed it for clarity. The second picture is fuzzy but it is seat bore without seat.

If its just loose in the bore thats easy to fix. But the other stuff not so much.

TOH

 

[Den N Ms]

Bob,With the valve seat wallowed out,that could be possibility be repaired.But with the corner bolt hole broken out and welded I would defiantly find and get a good rebuild able block to rebuild.You would be dollars ahead with one.Then maybe even a failure later with your original repaired block.

 

[Bob in Tennessee]

Here is a better picture. I called a machine shop and they said that no matter what the block would have to be removed from the frame with the crank removed as well. At that point it might as well be a total
rebuild but used block plus machine work plus rebuild kit is more than the tractor is worth. I was hoping there was a way to clean out seat bore and install a new seat in existing block. If you look closely the seat recess is pitted and uneven so I can't set another seat without some type of machining. The tractor is only
used once a week to pull my fishing boat in and out of the Duck river so she leads a lazy life.
Don't know why my camera started a video. Guess I don't have it figured out yet. Anyway the block corner can be patched with JB Weld and it hold for a while.
<video width=90% src=https://www.yesterdaystractors.com/cvvideos/cvvideo111557.mov controls>http://forums.yesterdaystractors.com/cvvideos/cvvideo111557.mov</video>