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Hi,
I forgot to add that the non preferential one would sometimes start and stop several times during the day when load dictated. I used to try and shed load ,reduce the reheat coils in the AC etc in an effort to get the boat to go on just one so we would have a 100% redundancy.
It was things like the stabilisers in heavy weather when the R.O Plant and Galley were running that was just enough to initiate a start cycle of the non pref one that used to be difficult to overcome.
We did 2.5 yrs around the world and came back with 20,000 hrs split pretty evenly between the two engines. I replaced the Cylinder head on the port one in Seattle in a day and a half including going to NC Machinery for the new bits owing to badly worn Exh. Valve guides ( a not uncommon problem with the 1500 rpm,160 EkW 3306 Caterpillar gensets) at around 5800 hrs.
On another yacht I was on in early 90's the Chief before me had run the lungs out of one of these to get it some 3000 hrs ahead of it's mate. His reasoning being that any major component failures that came along would not affect both engines at the same time and there would be time to remedy the fault whilst the other one roared away. Those ones which were also 3306 sets but rated at 125 EkW survived for 22 and 24,000 hrs before the short block was rebuilt.
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Cheers,
K1W1
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