A quick question, after finding out what engine I have in my new landie so I can change the water pump (long time since I have had 2 1/4 diesel) is there a difference between a series111 3 bearing diesel and a series 11a 3 bearing diesel as checking the engine number it comes up as a series 11a although the vehicle is a series 111. According to the previous owner the person they bought it of had rebuilt it a few years back. Once the water pump is done I've got to sort out the terrible heater plug circuit deep joy!!!!!!!!