IDIBRONCO
IDIBRONCO
This at 3000 RPM is probably about right assuming that you have 4.10 gears. A 18' boat usually isn't terribly large or heavy. Have you tried to pull this in overdrive?65 in drive,
These aren't powerhouses when compared to today's trucks, but they can pull pretty well when everything's right under the hood. Since you have black smoke coming out of the exhaust, I think that it's probably got plenty if fuel. I would look at the timing next. As the fuel system parts get more miles on them, the internal parts start to wear. As the IP wears, the timing retards. The IP and the injectors wear at roughly the same rate, so when one is at the end of it's lifespan, the other is too. This is why they should be replaced as a set. Replacing just one or the other (I'm talking about the injectors as one set of 8) may help or it may not. Even if replacing one does make an improvement, it won't be anywhere close to the improvement of replacing both parts.