Join Date: Mar 2006
Thanked 7 Times in 7 Posts
Rep Power: 12
First, I'd highly recommend you check the exhaust system for any leaks and equip your boat with a Carbon Monoxide detector.
I think one other potential cause of smoke from the engine compartment, could be leaky injectors. If fuel is entering the cylinders at the incorrect times, partially burned fumes might escape back through the open intake valves and out the breather.
Whatever it is, a good diesel guy should be able to diagnose it and fix it. These engines are pretty simple and reliable and will run for decades with relatively miminal maintenance. From what you've said about the person you've spoken to regarding your issue, I don't think you've found a good diesel guy yet. Ask around the marina, find out if there are any delivery captains around and talk to them about who they recommend.
Edited to to add:
Regarding props, keep in mind that engines develop their rated horsepower at a specific RPM. If for example your engine is rated at 27HP at 2800 RPM, you need to select a prop that will allow the engine to reach 2800 RPM. If the prop is too large or has too much pitch the engine cannot reach its rated RPM and will not produce full power. Its like driving a car in 4th gear up a hill, the engine is straining and fuel is being wasted. In a car, you downshift, with a boat you might need to select a different pitch for the prop.
That said, I don't think the prop is the problem your seeing or at least not all of it. A boat that's over-propped will usually indicated it by 1. Not reaching rated RPM, 2. Black/Dark smoke from the exhaust, 3. Running hot when pushed.
s/v Palmetto Moon
1991 Catalina 36
Last edited by PalmettoSailor; 11-28-2010 at 08:06 AM.