Hey all. i have a 87 3.0 mercruiser 140. Rough idel very rough . I rebuilt the carb with a kit from Mikes carburator and it runs better, no corn gas in the tank and about 4 psi on the fuel pressure. The carb was running terriable at idle before rebuild. Now hears the problem, its ideling too high at the moment , its a 2GC 7040084 and has a different bolt on pattern then most of the rochester 2 barell carbs. Most of the 2 brl are 2x3 3/4 mine is 2x3 1/2 ish.
So i move the linkage with the idle stop tight to the cam and the idle comes down, however i have to move linkage manualy which is leading me to think that there is a slightly small vacuum leak on this carb due to a leak on one of the components. I am fairly sure the rebuilt was spot on. It is a older boat so might be needs a new carb ( yes did all the on the water tune up stuff )
Heres my questions . Is there an adapter plate for the base bolt patterns ? If so does anyone know where to get it with out fabricating one ? I guess i would like to just buy a new carb thats only 100 bucks on amazon ( marine application) other than paying $400 for a new 2GC 7040084 style that seems to always be a problem on these motors.
Or is there a suitable 2GC 7040084 substitute ?
So i move the linkage with the idle stop tight to the cam and the idle comes down, however i have to move linkage manualy which is leading me to think that there is a slightly small vacuum leak on this carb due to a leak on one of the components. I am fairly sure the rebuilt was spot on. It is a older boat so might be needs a new carb ( yes did all the on the water tune up stuff )
Heres my questions . Is there an adapter plate for the base bolt patterns ? If so does anyone know where to get it with out fabricating one ? I guess i would like to just buy a new carb thats only 100 bucks on amazon ( marine application) other than paying $400 for a new 2GC 7040084 style that seems to always be a problem on these motors.
Or is there a suitable 2GC 7040084 substitute ?
