After having the fuel pump, fuel filter, all the plugs, and a couple of coils replaced the engine is now starting, however for about thirty seconds after start the engine runs roughly, then clears to run normally. I've been advised that the coolant system is over-pressurising which is causing water to wet the plugs after shutdown, hence the rough running after startup. The system is also losing coolant (200 mls per day). This (apparently) means a damaged head gasket (the second after 83,000 kms). So the solution is another gasket(s) replacement.
Thinking back, the engine suffered a leaking water thermostat housing about 6 months after the first top end overhaul. The overtemp only lasted about 30 seconds until I pulled over and shut down. And after replacing with a Kaiser housing I thought nothing more of it. But clearly, 30 seconds was enough to cause serious damage, which manifested itself about a year after the mod.
Anyway, for the sake of completion I'll post the result of the repair.
Thankyou all for your assistance and advice.
Last edited by TramPower4000; 23rd October 2020 at 13:00..
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