<Update 19 Sept 2015>
Injectors serviced and fuel pump flushed, started okay, but found rear head gasket blowing, so now I plan to remove the cab, and then start on the engine my initial thought is to remove the cylinder heads, sump and take out the pistons
Hone the bores, check the piston ring or replace, check the big-end bearings, re-seat the valves and test bench the fuel injection pump.
Reassemble and try...
I will need as a minimum a engine gasket set, so if anyone can let me know where I can find engine spare parts (model 0853) then please drop me the contact details
Br Malcolm