Merc 3.0 carb. issue

[Fun Times]

Are you talking about how important the engine serial number is for a Mercruiser engine?

There is a lot of info on the webs about this...Jeesh. Lol


Serial on motor is 0m688851.

Here is some information that should help save you a little bit of money.

Here is the parts catalog for your engine model,
http://www.mercruiserparts.com/selectDocs.asp?doc_nbr=804862+99

You're "non" TKS (Turn Key Start) carburetor parts,
http://www.mercruiserparts.com/Show...&inbr=4893&bnbr=110&bdesc=Carburetor,+Mercarb

Last but not least, the service manual for your engine model,
http://www.maxumownersclub.com/forum/site_files/manuals/mercruiser/26.pdf

Inside the manual, See FUEL SYSTEM Section 5B - MERCARB 2 BARREL CARBURETOR

Hope this helps, Good luck.

 

[Peels]

Are you talking about how important the engine serial number is for a Mercruiser engine?

Here is some information that should help save you a little bit of money.

Here is the parts catalog for your engine model,
http://www.mercruiserparts.com/selectDocs.asp?doc_nbr=804862+99

You're "non" TKS (Turn Key Start) carburetor parts,
http://www.mercruiserparts.com/Show...&inbr=4893&bnbr=110&bdesc=Carburetor,+Mercarb

Last but not least, the service manual for your engine model,
http://www.maxumownersclub.com/forum/site_files/manuals/mercruiser/26.pdf

Inside the manual, See FUEL SYSTEM Section 5B - MERCARB 2 BARREL CARBURETOR

Hope this helps, Good luck.

AWESOME! THANKS!

no, was talking about 3.0 carbs bogging down....many many threads on multiple forums...

and my motor doesnt have that "TKS"? it has an electric choke on the front....

anywhoo... thanks again!!

i took apart the dist. cap last night... cleaned up the points, and the rotor...

Ill replace the whole shebang and rebuild the carb before next year.

 

[Peels]

we're about to hit the downhill slide into spring! time to get ready for the season...(in my mind at least)


gonna go through the carb. wish me luck! go through the whole fuel system really...

many other projects to do as well.

lower unit coming off again, for impeller and gear lube. and welding up that anti cavitation plate.

got a nice little gelcoat crack in the keel. Pretty sure it was wet slipped by prev owner.... a known bad juju for glastrons I guess. its been there...be a good afternoon of work. I enjoy that kind of thing though.

Wife OK'd a nice stereo too.. the fun project!

SPring is coming! not really soon, but soon....

 

[MikDee]

Hey there, I'm a newbie on this forum, but not around boats, cars, & motorcycles. I have an idea for you, maybe it's a "power valve" issue in your carb? This usually spring loaded valve can get stuck sometimes. It operates between your idle valve, & main fuel valve. Providing fuel for mid range power. Check it out, and let me know?

Thanks Mike

 

[Peels]

well, thanks Mike....for popping in. do you mean the accelerator pump? I Plan on rebuilding the carb soon, that'll get a look by default. I've had a myriad of suggestions....that ones come up a few times.. or adjusting the arm that pushes the pump....

I appreciate all suggestions.... I REALLY feel its carb related. And not in fuel delivery TO the carb. but heres my plan...just because. Its a ten year old boat...what can it hurt..?

in my head, the symptoms it has....low rpm "chug" or "bog" make me think exactly as you mention. or, "transition" the point at which it switches from idle to main circuit... "pilot" on a mikuni.

its TOO cold right now, or id already be doing it!

i'm going to check/clean the screen at the pump.
check fuel lines
check fuel filter/replace
clean/rebuild the carb. (i'm a little bit nervous, a i've never done one of these..but much experience on single cylinder atv engines) nervouse because Im notorious for dropping and losing parts LOL. the last carb I did lost the main spring. BOOOOOIING across the garage. lost a whole day looking for it
new plugs again. maybe new wires, but they are relatively new....and the cap and rotor look fine inside, i cleaned it.

wish me luck! thanks again!

 

[MikDee]

No, not the accelerator pump, the power valve is usually a vacuum operated piston, with metering rods, that work against a spring to regulate fuel flow on the main jets. A Quadrajet has 2 sets of metering rods, primary, & secondary. The secondary set which works by the vacuum on the upper butterflies.

 

[Peels]

No, not the accelerator pump, the power valve is usually a vacuum operated piston, with metering rods, that work against a spring to regulate fuel flow on the main jets. A Quadrajet has 2 sets of metering rods, primary, & secondary. The secondary set which works by the vacuum on the upper butterflies.

are we talking about the same carburetor? I have the 2 barrel "mercarb"

anyways, Yeah all my knowledge comes from Mikuni carbs...i think that would be the spring and main needle. I know what you're saying. Makes sense to me..

no matter what its called .......rebuild kit is on its way. Its all getting a once over.... Old man winter doesn't wanna let go here though..... grrrr


thanks again!