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Another thing to look out for is if the sump level rises (especially if you have an intermittent 'miss'.
The injection pipes are 'internal' and if they crack and leak you will lose fuel into the sump (and the injector cam roller followers will wear flats on the rollers so the engine will miss - but when you check the gaps they will seem OK). The camshaft operates the injectors mechanically.
It might be worth doing a DDAD maintenance course as the engine is somewhat different to a conventional diesel with an injection pump.
Some marine applications use DDAD engines.
You might be able to buy a maintenance manual - or at least borrow one and read it.
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