Hi guys, quick intro... I've been a long time lurker/reader, great advice you guys give! I have a 2003 LR Disco with leaking coolant issues and overheating during the past 4 months. I replaced the water pump with factory part. This helped for a while, then replaced throttle body plate/gasket. Again this was a short lived remedy and the slow leaking coolant began again. Recently I replaced the radiator, thermostat, upper radiator hose with factory parts. I put it all back together, flushed out the cooling system and test drove it. It overheated within 20 mins and the coolant was gone! I have not been able to located the coolant leak. I am taking a stab in the dark here but I think it could be a head gasket. Need advice...I read the "must read" for head gasket repairs but I am a bit confused. On a 2003 LR Disco does one need to check the preload on each rocker arm?

 

Only if you are replacing the valve train... if you reuse your old stuff then nothing should change hey?