Don't know if it is any help,just done the head gasket on a td5 disco,replaced the fire washers and o rings,got a set from a land rover specialist for £6.00 put it back together ran for 5 mins and cut out wouldn't start,spoke to a mechanic he told me to go to land rover and get originalones(£50.00 inc the stretch bolts for the cam)and it started and runs like a dream.