My dad has a Cat forklift, that If my memory serves me is a V60B. It's a 6 cylinder motor.
He told me that today he had to change 4 plugs before it would start...they werent all that old, nor was it that cold (Phoenix Arizona). I'm not positive, but I think they were Champion D15Y, 515. Probably should say that the rings may be poor, when it runs it smokes, but memory a few from a few years back tells me it still had fair compression.
Today he asked two questions of me and so far I haven't found the answer on line.
1) How many different engines did it use?
2) What plugs should he be running in it(