Volvo Penta engines for speed and leisure boats are surely the best on the market, and they last for a long time, but how can you be sure what year yours was built?
When you examine the engine cloesely, you can pinpoint the time period to when Volvo built the engine. This is usually a close approximation, so it can save you a lot of money if you're buying one from an unfamiliar source.
Look for numbers on the decal, this way, you can determine the year at least. You can also look at lettering sequences to determine the year, for example, AQ and BB sequences ceased in the nineties.
The engine's color tells you a lot about it. A good example is an early red volvo engine, which is sign that its from the eighties. If the boat has a dark chocolate or charcoal color, you should be able to look up the information easily.
The current red engines are from 2000 and later. The decals on these don't give an exact year or date, but you can use the number sequence on the engine to find out.