[AT] Question on Massey 255

[Mike Meulenberg]

I have a Massey 255 with a Perkins 4 cylinder diesel engine. The problem I'm having is it never seems to warm up. I don't think its ever been in the green "operating" range since I've owned it; I'm thinking the thermostat might be stuck open, but was hoping to hear from others before I tear into it. It is quite smokey also, which I would take for a symptom of running cold. Any thoughts.
Thanks,
Mike M