Repower Cruisers Yachts

[Richard Khawam]

Hello, I am the owner of a 2009 Cruisers yachts 360 express powered by twin Gaz engines mercury 8.1 with ZF63IV (ratio 2.5) I am in the process of repowering my boat with twin diesel engines. I have contacted cruisers yachts and found that this boat model was powered with diesel engines from the factory with either Yanmar 6lpa-stp2 and zf63iv (ratio 2.5) or Volvo Penta D6-350 and ZF85IV (ratio 2) I am confused between repowering with brand new Yanmar 6lpa and keeping same transmission which will cost a big amount of money since I can’t find used Yanmar engines in my region and I will have to go new. Or I can go with twin used D6-350 since  I have found twin Volvo d6-350 with very low engines hours but from what I have found the d6-350 was used with stern drives transmission and the engines are very similar to the 370s but my main question is if I can install the d6-350 with zf63iv or I should buy zf85iv?

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[Tony Athens]

IMO, prop your D6 350’s to 3600 RPM minimum with the vessel loaded for bear, and you’ll be just fine using ZF63IV’s that are in perfect shape or “as new” …  

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