I tried to start the 77 mercury 1150 after replacing the distributor trigger, cleaning the carb and rewiring.
It is very hard to start unless I rotate the distributor half way between the idle and second pick up.
I noticed there is gas leaking from 1-3 carbs and the dripping pan is almost full of gas.
Here below is some check I did to identify the issue.
1. Float and needle and seat. I opened the float bowl twice and cleaned it well. The floats are not leaking, the springs are 3/32 inch. The gaps between arms are all good. The needle, seat and gasket are cleaned and air sprayed as well. And I tried to mouth blow the inlet with hand blocking the needle, the mechanic is good.
After assembling, I tried very hard to squeeze the bulb, and found only one or two dripping from carbs.
2. The rectifier is good. It's a new sierra replacement and test good.
3. The stator, I dont know. I use multi-meter to check the Hz between the yellow lines, it reads 1.0 k hz. The volt before start is 12.4 volt, the volt when the motor is running is 12.8 volt. When the motor is running, I pull the engine "+" lead from the battery, the motor stop immediately. It can not run without a battery.
4. The timing, I think is good. When doing battery cranking, the first pick up is 5 BTDC, the max advance and second pick up is 20 BTDC. I set the idle stop at 0 BTDC， but never worked in that position.
5. The compress pressure is 120 psi tested for all cylinders before I put the lower unit on and running the whole process with gas.
6. The idle mix screw is set 1 1/2 from lightly seat position.
7. When I clean the carb, several screw is not able to get off. I leave it on and put all in the carb can for 48 hours. And cleaned all the passages with compressed air.
8. The spark cable dose have some problem. But I checked and repaired them all. I used in line spark test and timing light to have it tested. The spark test kit and timing light are lighting for all the cylinders.
The above is all what I did. The following is what is happening now.
1. When I set the distributor at idle position, the motor can not start. I see a lot gas leaking from the open mouth of carb, 1, 2, and 3. The dripping pan is almost full.
2. When I set the distributor at between idle and second pick, it starts up and can run for a long time. But the rpm is high.
3. My original tachometer is not working. I don't know if it is damaged or the startor-rectifier system is bad.
4. I used multimeter to test the Hz between the yellow lines from stator, it reads 1.0 k Hz.
5. I used KEDSUM hour meter Tachom, which is a black box with simple digits reading on it. The battery of the box can not be changed. It reads 4000-10000. The wiring is set up on the spark cable of the first cylinder.
6. When the motor starts, I think at a pretty high rpm before throttle is opened, I set the mixer screw following the manual. Turning it clockwise until unstable and turning counter clockwise 1/4-1/2 turn. I set the screws for all the three carbs.
7.When it is running, it looks like the dripping does not happen.
8. When I try to turn the distributor to idle position which is 0 BTDC, it stops very easily.
Please help with the above information. It drives me crazy for weeks.
Thanks.
It is very hard to start unless I rotate the distributor half way between the idle and second pick up.
I noticed there is gas leaking from 1-3 carbs and the dripping pan is almost full of gas.
Here below is some check I did to identify the issue.
1. Float and needle and seat. I opened the float bowl twice and cleaned it well. The floats are not leaking, the springs are 3/32 inch. The gaps between arms are all good. The needle, seat and gasket are cleaned and air sprayed as well. And I tried to mouth blow the inlet with hand blocking the needle, the mechanic is good.
After assembling, I tried very hard to squeeze the bulb, and found only one or two dripping from carbs.
2. The rectifier is good. It's a new sierra replacement and test good.
3. The stator, I dont know. I use multi-meter to check the Hz between the yellow lines, it reads 1.0 k hz. The volt before start is 12.4 volt, the volt when the motor is running is 12.8 volt. When the motor is running, I pull the engine "+" lead from the battery, the motor stop immediately. It can not run without a battery.
4. The timing, I think is good. When doing battery cranking, the first pick up is 5 BTDC, the max advance and second pick up is 20 BTDC. I set the idle stop at 0 BTDC， but never worked in that position.
5. The compress pressure is 120 psi tested for all cylinders before I put the lower unit on and running the whole process with gas.
6. The idle mix screw is set 1 1/2 from lightly seat position.
7. When I clean the carb, several screw is not able to get off. I leave it on and put all in the carb can for 48 hours. And cleaned all the passages with compressed air.
8. The spark cable dose have some problem. But I checked and repaired them all. I used in line spark test and timing light to have it tested. The spark test kit and timing light are lighting for all the cylinders.
The above is all what I did. The following is what is happening now.
1. When I set the distributor at idle position, the motor can not start. I see a lot gas leaking from the open mouth of carb, 1, 2, and 3. The dripping pan is almost full.
2. When I set the distributor at between idle and second pick, it starts up and can run for a long time. But the rpm is high.
3. My original tachometer is not working. I don't know if it is damaged or the startor-rectifier system is bad.
4. I used multimeter to test the Hz between the yellow lines from stator, it reads 1.0 k Hz.
5. I used KEDSUM hour meter Tachom, which is a black box with simple digits reading on it. The battery of the box can not be changed. It reads 4000-10000. The wiring is set up on the spark cable of the first cylinder.
6. When the motor starts, I think at a pretty high rpm before throttle is opened, I set the mixer screw following the manual. Turning it clockwise until unstable and turning counter clockwise 1/4-1/2 turn. I set the screws for all the three carbs.
7.When it is running, it looks like the dripping does not happen.
8. When I try to turn the distributor to idle position which is 0 BTDC, it stops very easily.
Please help with the above information. It drives me crazy for weeks.
Thanks.
