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What he said ^^^@SEAWOLF 1998 3116's 350hp. Owned them for 4 years, very happy so far. Approx 1700 hours.
Many of us own these, many will chime in. Keep the fuel clean, don't let the engines overheat, change your oil and filters, and they run. Depending on the age, there is a major service at 2000 hours to be aware of.
Would buy a boat with these again with no question.
I didn't know SR installed any 300HP's; thought they were all 350. Learn something every day.The 300 hp and the 350 hp 3116's are almost identical except for fuel pump and injector settings and perhaps the turbo charger.
The 3116 's are very low maintenance engines. There are very few recommended procedures……@250 hours, reset the engine overheads- takes about 8 hours; @ 1000 hours have the after-coolers and heat exchangers cleaned cost varies depending upon how the technician cleaned the heat exchangers; @ 2000 hours, reset the overheads and clean the after-coolers and heat exchangers, again about 8 hours, plus the cost of the after-cooler service which will vary depending upon how the technician cleaned the heat exchangers.
Depending upon which Sea Ray your friend is contemplating, the boat could be a bit underpowered with 300hp engines. If that is the case, then be sure they turn up to 2800 rpm at WOT and don't cruise the engines at more them 2400 rpm, which is recommended cruise speed for the 3116. If they won't turn up to 2800 rpm, then limit your cruise speed to 86% of the WOT the engines will develop, until you either lighten the load or have the props re-pitched.
All in all, these are nearly bullet proof engines as long as you don't not over heat or overload them.
"And don't Cruise the engines at more than 2,400 rpm"
This is what kept me from buying a friend's 1998 400da with twin cats. He used to brag how hard he ran the boat. Plus they had over 2,000 hours with no service history at all other than his word.
I know you can pull these rpm numbers off of a gas engine (how many hours at what RPM range), can you pull them off of these cats? If you can't how do you know you're buying a boat where the owners kept to this?
Hard means he ran pretty much at WOT all the time.
how would you know if your over propped? you cant reach wot?
Or see what your boat pulls then take the props to your prop shop and tell then you need XX more RPM and they know what to to.Correct. Especially with the older mechanical diesels. Typically you want them to spin up to the rated RPM +25 to 50 as you run the boat, fuel water people gear etc with a clean bottom good props. Thats 2800-2850 for the 3100 CATs. The Cummins also have a specific fuel burn to be under to prolong the life of the engine.
If you a member on boatdiesel.com, there is a prop calculator that allows you to crank in your boats engine/transmission/weight and WOT readings (must be accurate, don’t trust stock SR tachs), and it will give you a curve of how much you are over or under propped. Ideal is right on the curve…not lugging the engine, and also not wasting fuel if under propped.
SBmar.com has lots of information on the Cummins side of things.
I had my props cleaned and tweaked. I couldn't go over 2650. now I'm at 2850 with the sync on. I was thinking of maybe pitch it one degree or have them cupped