Arrowglassrestorer
Seaman Apprentice
- Joined
- Feb 11, 2017
- Messages
- 31
Rebuilding my mercrusier 2 bbl carb 1389-9562. In the base of the bowl there is a power valve and in the air horn there is a spring loaded piston that is supposed to retract under vacuum thus closing the power valve. The problem is that I can't get it to retract if I put vaccum in the hole leading to the piston. However the piston is easily moved in and out with my finger. This carb has very little use(been on shelf) and the piston should not be worn out. I don't believe there are any seals inside the piston to wear out. While the power valve was included in the rebuild kit there was no rebuild for the piston in the horn. If I install the carb as it is the power valve will be open all the time since high vaccum doesn't move the piston up to allow the valve to close. Any suggestions