can be tricky. I replaced a 3GM30F (hydrolock, ruined engine) with a 3GM30F. Same engine
, about a few years newer. Kept all my old spares. Sailed for a couple of years and needed a new impeller. Pulled out my spare ..... not the same!!! Apparently (and this is what the dealer told me) this was in 2003 and Yanmar sensing a downturn did not import
a lot of diesels to North America. The replacement I got was a European model and took a different impeller. I'd been sailing for years thinking I had one and bingo I really didn't have one. Lucky I was in Toronto when I needed the new one and it wasn't a problem getting it. So what they say about installing the spares and keeping the originals as spares is a good idea. At least you will have the comfort of knowing you've got the right spare. Now all I need is for someone to tell me that the oil
cooler in a 4JH3E needs a zinc! Apparently some do and most don't. Spent a week getting to the bottom of that one. Yanmar parts can drive you crazy.