Hi All, have an ex army Defender with C reg in front. 2.5 n/a. Have had loss of power(ie it won't go anywhere) when hot recently. Starts fine, but when hot no power! Leave it for an hour till cold, and off she goes no problem! Started with fuel system. Drained tank, checked fuel intake pipe from ther, new sedimenter,lift pipe, filter, and a couple of pipes that were weeping.
I am NOT an expert, or even very good DIYer. Have now removed cylinder head. BUT no obvious problems with head gasket (have had no water loss or water in oil).Plate on engine, says overhauled 1995. Still army I guess.Speedo reads 40+k.
Am now looking at valves and pistons. Some carbon build up, but nothing obvious. No 3 cylinder valves are not as carbonised as others. They look as if they had been burning hotter. All springs etc look normal.
Next step, valves out, perhaps new springs, check valves, seats etc????
Any ideas would be very welcome.