Land Rover Repair: 03 red discovery electrtical gremlins, head gasket replacement, sodium silicate

Question
John:

You saw my car recently on a diagnostic visit. To summarize:
The truck has 76k miles on it.  Weeks ago I had a stumble and led to a head
gasket replacement.  Same problem, now it is liner crack in #6?? .  I decided
to try the sodium silicate block sealant.  However during the flush of the
coolant I got the area by the fuse box soaked.  The engine ran fine during the
whole sealing process, but very tough to start and now will not run more than
a few minutes before the engine dies and a relay in the engine compartment
starts "singing".  It ran for about 30 min, with no coolant loss (pint or so
before) and then died.  I took the engine fuse box and all the area connectors
apart, dried and used contact cleaner to dry & clean everything (including
heat gun).  I switched relays and that one started singing too!
Good news is the engine block/gasket issue is improved, bad news is what??
Thanks
Kevin
PS  would bring it in but not sure it would make it.

Answer
Those chemical cures are nothing but a temporary fix.  The heat and pressure at the liners is just too high.  I'm afraid you're facing a new liner in that motor, or a new short block.  Pretty much as we discussed.

I don't really know why getting the fuse box wet would cause a problem, provided you dried it out.  Try spraying electrical parts cleaner all around and under, and in the sockets.