mpinkstone
Recruit
- Joined
- Jul 22, 2007
- Messages
- 4
I need help troubleshooting a problem and I need answers to a few questions.
The problem: 9.9HP mercury won't accelerate. Starts great and ildes great and will even run great at low RPM, but when you try to accelerate the engine falls flat on it's face. I've had the carb. rebulit checked the fuel line and put new gas in it. No help. So I took my service manual and started following the troubleshoot steps. I first disconnected the low oil switch, because the way I understand it, it will not allow the engine to rev up. I then checked all the resistance valves according to the book, and all where fine. I checked the stator coils,primary and secondary and the 5K ohm plug cap, the trigger coil. I was going to do the voltage checks, but I don't have a meter that will read Peak vaules, I guess I could use my Oscope. So then I put my timing light on and found the idle and low rpm to be dead on 5 degrees BTDC, but when I started to accelerate the timing never advance. Any ideas
Question # 1 How do I determine what year the motor was manufactured? The only number I can find is the serial # 0H000254.
Question # 2 I think the CDI unit/ Switch box might be the problem, but I'm not sure about the part number, because I can't cross reference the number I found at www.mercruiseparts.com over to CDI's part number. The number I came up with was 825667T, which superceded 825667.
The problem: 9.9HP mercury won't accelerate. Starts great and ildes great and will even run great at low RPM, but when you try to accelerate the engine falls flat on it's face. I've had the carb. rebulit checked the fuel line and put new gas in it. No help. So I took my service manual and started following the troubleshoot steps. I first disconnected the low oil switch, because the way I understand it, it will not allow the engine to rev up. I then checked all the resistance valves according to the book, and all where fine. I checked the stator coils,primary and secondary and the 5K ohm plug cap, the trigger coil. I was going to do the voltage checks, but I don't have a meter that will read Peak vaules, I guess I could use my Oscope. So then I put my timing light on and found the idle and low rpm to be dead on 5 degrees BTDC, but when I started to accelerate the timing never advance. Any ideas
Question # 1 How do I determine what year the motor was manufactured? The only number I can find is the serial # 0H000254.
Question # 2 I think the CDI unit/ Switch box might be the problem, but I'm not sure about the part number, because I can't cross reference the number I found at www.mercruiseparts.com over to CDI's part number. The number I came up with was 825667T, which superceded 825667.