I thInk the 14B and 15B would be easier to procure these days and parts unique to these engines will be easier to get in the long run than the 13BT. And of course they will have more cubic capacity and thus more power. Hino's smallest truck engine, N04C appears to be based on the 15B
Its customary to state the klms it has done.
It most likely has wear in the piston rings. This makes it hard to compress the air at start up causing smoky starts. Then, when the engine is warm, the rings expand and the compression increases.
It is after all an engine approaching 40 years old.
A...