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in modern diesel engines, the compression does not ignite the diesel that is in the cylinders. Rather the cylinder compresses and heats up the air and diesel that is injected in to the cylinder combusts because it enters a very hot environment.
Diesel engines achieve this by compressing the diesel to 1000-2000 bars. So you would also have to compress your hydrogen to similar pressures.
As far as i know the old tech uses a pre combustion chamber ehere the diesel is ignited and sucked in to the chlinder while still burning. I have a feeling that your hydrogen would very rapidly all combust and not make it inside the cylinder.
I do not think that you can get the timing right if you just let the engine suck in hydrogen and have the compression ignite it.
I am no expert but you may have to use a spark.
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