I do not know what the WOT rpm
should be on your 3116 Cats, you can contact a Cat dealer with the model, serial
number and arrangement number and they will give you the specified rpm. With a clean bottom and boat loaded how you normally use it and engines in proper tune you should be able to reach that rpm. You need make sure your tachs are correct before doing any other test, you can use a photo
tach to make that comparison. Do you have boost gauges and exhaust
gas pyrometers? These will help in determining engine load and condition. With the hours on yours there should have been a 1000 hour service
performed recently by a Cat dealer mechanic
. A dealer can check the records and tell you if this has been done, if it hasn't I would have them do it because of the special tools needed to set the injectors.
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