Liner Seals...

In a "wet" liner block the liners themselves are completly surrounded by water direct. The block is completly open. The liners themselves are the "tubes". Once a liner has been removed you can see into the water jacket. When all the liners are removed all you have left is the top part and the lower part of the block and a big empty space. The top part of the block usually is arranged so that the liners fit in a "step". This prevents the liners moving downwards. Normally the manufacturer specifies a protrusion of the liner above the block surface to nip the head gasket tight around the area of pressure. This can be adjusted by shims under the liner "step". Super Major blocks have a sealing ring here. The bottom area of the block where the liner fits has a sealing ring to prevent water getting into the sump and mixing with the oil. All this range of tractors (and in fact any tractor with "wet" liners) can suffer from corrosion in the sealing ring groove or on the liner itself in the area of the groove and seal. Certain waters can either increase or decrease the problem. 50% anti freeze has gone a long way in preventing the problem. We called it "metal worm" because it looked as if a worm had eaten a track in the metal.When liners are replaced, soap is used to ensure they slip into place easily and they can be pushed in by hand rather than the press that is needed with "dry" liners.

You know if you have a fault as the oil goes "milky" when the engine is run and steam appears out of the breathers. It is not a bad job to do. I replaced a liner in my Nuffield 4/65 in 4.5 hours. If your tractor has been left without coolant in for some time you might have a problem as the seals may have perished. The fact that it has been kept outside will not harm it.

Sorry for the lenght of post. Hope you can understand it. E-Mail me if you have a problem.
regards
Brian

I suppose I am not so likely to have a problem as we use a lot of antifreeze here, winter temperatures can be quite low. A couple of winters back we had -38 Centigrade one night. Chilly!

Thanks again, J-P