Merc 3.0L Alpha Stumble

[Harl]

Hi all, great site. I have a 87' alpha 1 3L that runs and idles great except when you go from idle to WOT quickly(ie. skiing) It will stumble and sometimes die and you have to restart 3 or 4 times before it'll go. Pain in the arse with someone in the water. Any ideas on where to start?<br /><br />I took the air filter off and looking down in the carb I see one side has nasty black buildup. I cleaned it out best I could and got some carb cleaner but Im kinda worried about if I spray it in there will it come loose and make it worse?<br />How hard is carb rebuild on that engine?<br /><br />Sorry for the long post. Thanks in advance.

 

[Wingn48]

Re: Merc 3.0L Alpha Stumble

I'd pull that carb and rebuild it, if I were you.

 

[Harl]

Re: Merc 3.0L Alpha Stumble

Well, i didnt get a chance to test it out this weekend because I think my impeller is shot. <br />Its overheating quickly and I confirmed that the waterpump is working by opening the screw on top and turning the engine over. Looks like it has good pressure too. <br />I can manually fill it up and it will stay cool for a few minutes until the water is pumped out. <br />Question is: How hard is it to pull the lower unit to get to the impeller? Anything I need to watch out for? <br /><br />Thanks