Hello - on the lh side of the crank case half way along towards the bottom are two 1/2 inch threaded lugs with allen key sockets. these access the engine coolant
, and would feed a heat exchanger
for domestic hot water
However, they are rusted in, and i have just stripped the socket in one. Do I drill them out, or is there a magic spray to loosen them?
Also, why are there two when I only really need one? - Generic diagrams show one outlet lug, and the return circuit T -'d into the rube piping at the top of the conversion.
Failing a solution to the rusting problem, can anyone suggest alternative hot points to tap to supply the domestic HW heat exchanger