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Cat's are my favorite and I think everything is laid out well, maintanence items are easy to get to, parts are cheap, and they run........with very few issues. Not to mention you can get CAT certified service and parts worldwide. Try getting to the aftercooler on a MAN to clean it every 2 years as the service manual suggests, it's a nightmare on the 1050's and 1300's (pre-common rails) that requires removing all kinds of stuff. Cat's can be a little noisy, but they offer a lot of low end torque, will idle all day without an issue, run clean, never have an oil leak......I prefer them, and I've run all of the different engines from Gardener and Perkins, to MTU 16v2000's and MAN common rails. The pre-common rail MANs and MTUs were horrible when it comes to smell under 1,000rpms, also blue smoke at cold start up...... in a sportfish they'd make you puke when you trolled with them.......
You're not working on 3506's if they're 850hp.......It sounds more like 3406's possibly. A rubber impellor's service intervel on that motor is every 500hrs. 1500hrs on a rubber impellor is extraordinary. Also chances are those motors missed their major 1000hr service which includes lashing valves, checking turbo's, cleaning aftercoolers, etc. etc. etc. ohhh yeah and changing impellors.
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