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  1. J

    AQ D40A fresh water is under pressure and go out on filler cap on thermostat housing

    "I have this problem immidiatt "I have this problem immidiattely when I purchased a boat with two D40A, three years ago. I can drive but I must filling up fresh water every two running hours. All the mechanics told me, that I must take engine out and check the heads if they are cracked. But in...
  2. J

    AQ D40A converting to AQ AD 40B

    "Maybe someone have some exper "Maybe someone have some experience with upgrading D40A to AD40B? I have twin D40A with 280B legs on Coronet 32 Deep sea 1978, six tons of weight. On 3200 rpm I achieved only 16 knots I think this is a half glidding. So I want to upgrade engines to have more power...
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