Hi,
I have recently purchased a boat with this engine that is now very difficult to start and when it does start it runs very rough. Engine serial number is 0G291239 which is circa 1997 vintage (i believe).
I have done the following checks:
1. replaced all four plugs.
2. removed all plugs to check for spark and there is a very weak one.
3. checked voltage during cranking at all ignition coils and no voltage measured.
4. checked voltage at switchbox circuit and it did not meet specified level.
5. Manual then states to disconnect the ignition switch, stop switch, and mercury switch black/yellow wire (s) from the switch box. With that wire disconnected there is still insufficient voltage when measured at switchbox.
6. Both low and high spd charge coil voltages checked and below spec.
7. Disconnected the blue and blue/white stator wires and checked resistance. Spec 5700 - 8000 ohms, actual 5,600 ohms.
8. Disconnected the red and red/white wires (high spd charge coil) and checked resistance. Spec 56-76 ohms, actual 23 ohms.
9. Checked for continuity to ground on both red and blue stator wires and no problems.
10. Trigger coil resistance checked and found Ok.
Manual states to replace the stator if resistance is not within range.
This is my first experience with diagnosis on this engine and I don't want to purchase a part that is not faulty. Does anyone have any thoughts on whether this lower resistance measured in stator wires may be contributing to my low spark issue, or alternatively, is there any other checks that should be done.
If it is a stator I will most likely send to marine repair shop as removal of flywheel is a bit daunting for me.
Thanks in advance.
I have recently purchased a boat with this engine that is now very difficult to start and when it does start it runs very rough. Engine serial number is 0G291239 which is circa 1997 vintage (i believe).
I have done the following checks:
1. replaced all four plugs.
2. removed all plugs to check for spark and there is a very weak one.
3. checked voltage during cranking at all ignition coils and no voltage measured.
4. checked voltage at switchbox circuit and it did not meet specified level.
5. Manual then states to disconnect the ignition switch, stop switch, and mercury switch black/yellow wire (s) from the switch box. With that wire disconnected there is still insufficient voltage when measured at switchbox.
6. Both low and high spd charge coil voltages checked and below spec.
7. Disconnected the blue and blue/white stator wires and checked resistance. Spec 5700 - 8000 ohms, actual 5,600 ohms.
8. Disconnected the red and red/white wires (high spd charge coil) and checked resistance. Spec 56-76 ohms, actual 23 ohms.
9. Checked for continuity to ground on both red and blue stator wires and no problems.
10. Trigger coil resistance checked and found Ok.
Manual states to replace the stator if resistance is not within range.
This is my first experience with diagnosis on this engine and I don't want to purchase a part that is not faulty. Does anyone have any thoughts on whether this lower resistance measured in stator wires may be contributing to my low spark issue, or alternatively, is there any other checks that should be done.
If it is a stator I will most likely send to marine repair shop as removal of flywheel is a bit daunting for me.
Thanks in advance.