I have a 99E with a bad engine (crankshaft / block issue) and have a good running 333C removed from a 12F. Can I install the 333C in replacement of the D333?
They did come out in some countries with the D333C and the 3306 as those engines became available as the 12E was still made up to 1974.
I assume then that the bigger bore / stroke engine will fit using existing engine mounts.
Maybe, I do not know what different mounting points and flywheel/bell housing attachments the later engines had. But they certainly did fit later engines to the 12E. Here is one with a 3306. https://www.tradefarmmachinery.com.au/detail/caterpillar-12e-17k-825081