Cat 3204 direct injection diesel?

As I recall, both 3204 and 3208 were DI from the beginning.

The early non turbo 3204 engines were the pre-combustion chamber type with glow plugs. My manual shows both configurations, but does not mention the serial number cut off.

They switched at some point and turbo charged them at a later time also.

I've never seen a 3204 with pre-combustion chambers so it must have been
pre 1980's if they built them, only changes I know are with the fuel injection
when they went to scroll type in the mid 1980's.

943's were fitted with direct injection engines but the early 931 may have had
pre-combustion chambers, did have a 931 once as I recall it took more cranking to start it than the later 943, been running 943's for over 20 years!

shovel man.

It's definetely a 1970s engine. They were in the original D3 tractor and the 931 loader plus some others.

Looks like they changed about 1978 from the info I have.

Thanks. That will help me out. I'm looking at a machine long distance and I can't figure out which engine is in it.

If you have a specific model I may be able to tell you at what serial number the change took effect.

D3 79u series.

That was the first one to come out and was 1973 and they were made in Japan.