I have been doing some maintenance on my Yanmar 3GM30 and am struggling with the fact that it doesn't have an air filter, the service manual says it should have a silencer and a foam filter as shown below. Plenty of comments on other forums that say you don't need one and just as many that say you do with most saying the genuine product is useless and after market is the way to go. I found Walker engineering in Brisbane do custom filters for Yanmar engines, anyone used them are there off the shelf products suitable for marine? I assume that the filter has been missing for a long time and for its age the engine doesn't use much oil and runs well as is. What are your thoughts brains trust?

Cisco you will be pleased to know that I have started stripping out that gigantic petrol compressor from the engine bay. Wasn't much point having the potential to fill dive tanks or use a hookah if you cant access the port side of the engine for service and repairs or even change out the fuel filter water separator!