Lister CE decompression changeover damage

[Mtour]

Hi all..
 I have purchased a 1950 lister CE and am in the process of dissasmbaly and have found a exhaust valve and seat that are pitted badly. From what I can figure is the opening to the expansion chamber in the changeover has been blown out, and the debris damaged the valve and seat. I have a new set of the shafts but not the half bowl that makes the expansion chamber. Not sure if I should use the new shafts without replacing the half bowls, as the old shafts would be mated to the old bowls.. Also not sure if the bowl part of the expansion chamber is similar to other model lister...
I have attached some pics of the bowls of each cylinder,

 To me it looks like the damage has been done, could it be run like this..

Any Ideas.... Thanks..

[sirpedrosa]

Hi Mtour,

Just lap valve seat, and COV doest look so bad.

BR
VP

[Mtour]

OK

Thanks for the reply..

[listard-jp2]

If your interested I have NOS valve guides and head gaskets available for the Lister CE engine, PM me if interested.

[Mtour]

 I tried lapping the valve, used a drill... the valve seat still has deep pits, didn't want to grind any more as the valve face and seat are starting to curve. Really not sure what to do about this..

[mike90045]

Intake and Exhaust valves:
Valve heads recessed into cylinder head face by 0.055" Min to 0.100" Max
 Bump Clearance 0.045" to 0.050"
  Valve Seats (None OEM)
    Detroit Diesel series 92 valve seats are a very close replacement


I have a clone, and no change over system, but maybe it's seat is the same as the others ?

[Mtour]

Thanks for the reply...

  Just not sure if the head should be taken to a machine shop and have a insert put in, or run it the way it is.

 thanks

 

[Hugh Conway]

@Mtour......My 6/1 had badly recessed valve seats and also a damaged bore. The valve seats were fairly inexpensive to get replaced at a machine shop. At the same time, they re-sleeved the cylinder and replaced the valve guides. Money well spent.
If you are going to use that engine at all, you'll eventually want to refurbish the seats and valves anyway.
Cheers
Hugh