Apart from the Daihatsu's own 3-cyl 1.0L CD engine, the only other one that I can recall that is nearly plug n' play in the Hijet is the Peugeot TUD4 which was used in the Piaggio Porter, a license-made badge-engineered version of the Hijet. The downside is that both these engines being IDI, they're not so tollerant to frequent stop-starts. But might fare reasonably with vegetable oil-based fuels.
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