How To: Rebuild a Mercarb - Part 2: Reassembly

In this video I show how I re-assemble my 2 barrel Mercarb from my 5.7L Mercruiser. It has been sitting for some time, so I thought it would be a good idea to throw a rebuild kit on it. Stick around to see how these things go back together!

[@Arcturian1111]

That float is supposed to be level perfectly. I watched Mike's carb video. It makes more sense.

[@byrongilcrease]

Great detail on the video. I don't wanna be "that dude" but there is a proper tightening pattern on the screws on the top of the carb. You should've tightened from the inside out according to the Mercruiser Bible. Good job overall though.

[@ashipshow]

Thanks for watching... good to know about tightening sequence... these are the awesome useful comments that help others out... thanks again

[@jonathanharrington9648]

How'd it run afterwards my carb uses steel washers but it's a mercarb for a 3.7

[@ashipshow]

I've only run it out of the boat so far, but it seemed to run great. Thanks for watching

[@thedodgelover08]

Apparently there are several different power valves for the carburetor and the one I got from a rebuild kit is incomplete without a spring and retainer. Where did you get your power valve? Thank you.

[@ashipshow]

Scott, I used the Sierra carb rebuild kit PN 18-7098-1. The power valve that came with it was the same as the one I removed.. My best advice would be to go to marineengine.com and they have a fantastic list of mercruiser engines/years/models and the correct carb kit for it.

[@thedodgelover08]

Madprops Boatworks thank you for the quick reply and information. I will look into it.

[@andyhollister4610]

Holy f,n shit dude I've been looking for this one 30 seconds of video for like 2 weeks!!!🤯🙏🙏🙏. you just save me from slamming my carburetor into a brick wall if anybody says anything bad about your video f*** them f*** the haters man thank you for taking the time to post this sorry about the language but if you only knew.. this 1979 boat was the only thing I got from my father major in the Air Force tragically drop dead playing tennis , stepmom gave it to me because she couldn't start it to sell it and it was going to cost her money to haul it off. It's Priceless to me I named her" oh will "

[@MrBanacek]

Thanks much for the help. Your calmness and explanations made this a breeze. Much obliged.

[@leonardlewis]

Can I buy a new carburetor replacement that is ready to just replace and go?

[@sethfriesen1818]

My power piston was bent is this normal? Also the power needle is completly different and longer than the old one

[@sophiacardenas341]

Do you happen to remember the size of screw you used to replace the choke arm screw with?

[@GlennKutschera]

Very helpful! I will let you know how the boat runs this coming weekend. My issue has been stalling when accelerating from the preset slow, near idle, forward position which I think was due to a warn out accelerator pump.

[@nathanbrever32]

I’m having the same problem with my mercruiser. Did rebuilding your carb and replacing your acceleration pump fix your problem?

[@slh4673]

What kit do you buy to do this job?

[@ashipshow]

It was a sierra brand

[@FlyMeAirplane]

Loved the click on the crescent wrench!

[@darwinrivas7067]

Man can you send me a link to where you got that awesome torque wrench from 🤣🤣 loved it!!

[@waynemollentze5432]

Also, wouldn't it be easier to just measure by the Millimeter which is on the other side of that little measuring stick

[@ashipshow]

Probably, but for reference I was using the mercruiser manual which stated everything in inches.. the neverending debate of metric vs imperial

[@jtocwru]

I'm sorry, man, but the music and throat clears were too much. I gave up and watched Mike's videos!

[@e55_wagon]

Hey another great video, very helpful! However, I am currently in the same boat... my question is, did you recieve a different accelerator pump in the new vs the "original"? The new pump is shorter, also the base is slightly different in taper design. However same diameter. Weird. I have the same merc carb 2 bbl, elec choke installed on my 5.7 searay. Thank you

[@ashipshow]

I believe my accelerator pump was the same, just the seal was a different color... maybe someone put the wrong one in last time it was rebuilt... have you tried searching rebuild kits with the serial number on the carb? Thanks for watching!