On many older boats from the UK to Canada, and from Thailand to Hong Kong, the deep purr of a well-tuned Gardner diesel wakens fond memories for many mariners. When the British firm discontinued volume production of their standard engines in the early 1990s mariners had to choose another manufacturer to meet their expectations for quality. In Hong Kong this was made easier by the strong presence of Cummins marine diesels since the early 1980s. Otto C. Y. To, Deputy General Manager of Shun Fung Engineering Ltd…