Marine carb rebuild

[ktraver97ss]

So, going to take a stab at rebuilding my boats carb tonight. Its off a 3.0l merc, and seems pretty straight forward, but I have never done it. All i know are coil packs and ecu's lol. I got the rebuild kit, but man there are a lot of little parts in it because it is some universal rebuild kit that works for several different carbs. Anyway, are there any helpful hints or things I should have on hand before I take this thing apart? Im thinking Ill just need basic hand tools, some rags, and carb cleaner, no?

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[Turbocharged400sbc]

You won't have any problem
a marine carburetor is no different from a standard automotive aside from some fuel redirect changes to prevent fires from getting outside the carburetor and spark arrestor
Tip: If something isn't going together just use a bigger hammer

 

[Yaj Yak]

cough buy a new one cough

 

[Turbocharged400sbc]

Are you mad KJ you don't buy a marine carburetor....

 

[Yaj Yak]

wat

 

[ktraver97ss]

Already bought rebuild kit, would rather not buy a new one u lazy facker.

 

[Yaj Yak]

nah I'm just saying buy a new one because when you rebuild this one you won't be happy when it doesn't work right.

 

[Burtonrider10022]

Triple check your tolerances before finishing. Guys on the Polaris forums Fuck up the pop off pressure or jet sizes all the time and then have to redo the whole damn thing.

, a lot of people have trouble when using non-oem/non-Mikuni kits. Idk if your Merc will be quite as finicky, but it's something to keep in if you have any issues later.

 

[ktraver97ss]

Tolerances?

 

[ktraver97ss]

New carb on ebay is $285...I can rebuild it, I have the technology.

 

[PANDA]

What makes you think you need to rebuild the carb?

(or you just want to-do it?)

 

[ktraver97ss]

Hell no i dont want to. lol Its been running rough, mainly a large hesitation during acceleration right before planing that is really annoying esp when the boat is loaded up. After some online research its most likely the carb, its the original from 92. I just did plugs and shit a couple years ago and they all looked good when i put it away last year.

 

[bikrboy128]

Well, at least you know you can get a new one if you fuck it up.

Since it's a universal kit, you're probably going to have a lot of extra parts from the kit, and also make sure you match the jet sizes up.

 

[ktraver97ss]

Went nice and smooth, but the thing looked immaculate, barely needed to clean anything. Im wondering if this was my problem. I guess a spring or something could have lost some pressure over the years, but Im guessing its gunna do the same shit. fml

 

[1quick]

does your carb have that plastic screen filter in the fuel line fitting, is there a hesitation under wot

 

[1quick]

id do that little carb filter a water seperator and see what happens, if that dosnt fix it its probably the anti siphon valve ontop of the gas tank, or a slight clog in the screen on the fuel pick up in the tank

 

[ktraver97ss]

does your carb have that plastic screen filter in the fuel line fitting, is there a hesitation under wot

Yes, and yes, but couldnt get the fitting off at the house. Going to bring it to the shop to put it in the vice on Sat and change that too.

id do that little carb filter a water seperator and see what happens, if that dosnt fix it its probably the anti siphon valve ontop of the gas tank, or a slight clog in the screen on the fuel pick up in the tank

Where is the water seperator?

 

[1quick]

should have a spin on that looks like an oil filter mounted around the motor someware but possibly not

 

[ktraver97ss]

Yeah just googled, doesnt look like the Merc 3.0L came with one, but some people add one to the fuel system. yay, more work to do that I have no time for. I need to hire a detailer so I can catch up on my projects.

 

[1quick]

if your hesitation is under wot also then i would go after the anti- siphon valve and the pick up tube screen also but that carb filter should be changed anyway

 

[ktraver97ss]

10-4, it does it under wot, but also under less throttle I think. I remember it being worse under more load when the boat was loaded up with beer and vaginas, but just me in there it barely hesitated.

 

[1quick]

i had a similar problem last year, you can get rid of the anti siphon valve and put a regular barb and a little ball valve so you can still shut the fuel off, the anti siphon valve is only there so if your fuel line gets cut it wont dump all the gas into the bilge, the spring often brakes and wont alow the check ball to open all the way and thats ware your hesitation comes from alot of the time

 

[PANDA]

break out another thousand

 

[ktraver97ss]

It cost $7 shipped, stop it negative nancy.

 

[PANDA]

lol

Working on Watercraft at PAF on sat? I will bring the waverunner by.