Originally Posted by HDAV
I've had a few of these in bits & yes they are the Isuzu built engine used in Astras etc. The block & head are the same, starter & iirc alternator from some vehicles fit. Gaskets & filters can be used from the cars. Crucially the pistons injection pump & injectors all differ so its not a straightforward swap. That said many folk have fitted automotive pistons & they do run, how long for is anyones guess. The life expectancy of those engines in a sports boat or rib isnt good so maybe cheap rebuilds are the way to go. Heat exchanger and intercooler both suffer corrosion & should be kept a close eye on.
Overloading is the quickest way to kill one & they should be slightly under propped. Prop for 4600rpm wot & just never go there & your not far away & unbolt the wastegate actuator regularly and check the wastegate is free. When the wastegate sticks the engine performance actually improves because they overboost so folk think its going great when actually its destroying itself.
Run lightly loaded carefully maintained they are a gutsy frugal engine but neglect or flog one at your peril.
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