wcsd106
Petty Officer 2nd Class
- Joined
- Mar 27, 2010
- Messages
- 182
First off, I'm still looking for a service manual for my motor. I think I have found it here: Link
Until I can get the manual, I'm still trying to troubleshoot engine problems.
Before, I was having prop shaft issues. That has been replaced and the service tech replaced the fuel pump diaphragm at the same time since one of the cylinders was flooding out when he tried to fire it up to test the engine.
I was finally able to get back onto the lake today and was met with disappointment.
Idling seemed fine and the engine fired right up. After idling out of the no wake zone, I went to throttle up the motor. It seemed like it was bogging down and just didn't want to push the boat up out of the water and onto plane.
The tach showed a max RPM of around 3400 at WOT. Well below the 5K+ that I should be seeing.
The prop in use was recently rehubbed and was the prop that has been on this engine for years including which time it was in good operating condition.
After I got home, I started looking over the engine to see if I could find anything obvious sticking out.
The one thing I noticed was that the fuel input fitting running to the top carb from the fuel pump was loose and would turn by hand. I removed the fuel line running from carb to fuel pump and tightened the fitting then replaced the fuel line. Before it was tightened, I hit the primer bulb and fuel was leaking around the threads.
All of the spark plugs look decent.. not shiny or brand new, but not destroyed and burnt up. They are cheap enough that if necessary I may replace those as part of a standard tune up as I get this thing up and running.
I am still at a loss as to why the engine sees around 3400RPM at WOT. I have limited experience with marine engines, but my first guess would be carbs or ignition.
Is there a good place to start checking that I could do before I get my manual?
Also: Is the manual I linked above correct for my motor? 1984 Mercury Black Max 200HP V6?
--->
I have been searching through the forums and reading some notes over at CDI electronics. This appears to be an ignition related problem. Any suggestions on getting started with this?
Until I can get the manual, I'm still trying to troubleshoot engine problems.
Before, I was having prop shaft issues. That has been replaced and the service tech replaced the fuel pump diaphragm at the same time since one of the cylinders was flooding out when he tried to fire it up to test the engine.
I was finally able to get back onto the lake today and was met with disappointment.
Idling seemed fine and the engine fired right up. After idling out of the no wake zone, I went to throttle up the motor. It seemed like it was bogging down and just didn't want to push the boat up out of the water and onto plane.
The tach showed a max RPM of around 3400 at WOT. Well below the 5K+ that I should be seeing.
The prop in use was recently rehubbed and was the prop that has been on this engine for years including which time it was in good operating condition.
After I got home, I started looking over the engine to see if I could find anything obvious sticking out.
The one thing I noticed was that the fuel input fitting running to the top carb from the fuel pump was loose and would turn by hand. I removed the fuel line running from carb to fuel pump and tightened the fitting then replaced the fuel line. Before it was tightened, I hit the primer bulb and fuel was leaking around the threads.
All of the spark plugs look decent.. not shiny or brand new, but not destroyed and burnt up. They are cheap enough that if necessary I may replace those as part of a standard tune up as I get this thing up and running.
I am still at a loss as to why the engine sees around 3400RPM at WOT. I have limited experience with marine engines, but my first guess would be carbs or ignition.
Is there a good place to start checking that I could do before I get my manual?
Also: Is the manual I linked above correct for my motor? 1984 Mercury Black Max 200HP V6?
--->
I have been searching through the forums and reading some notes over at CDI electronics. This appears to be an ignition related problem. Any suggestions on getting started with this?