CD-16 Carb Adjust

[steveh]

Hey Guys,

Thanks for all the help with the CD-16. She’s back to starting easy and purring like she should.

I do have a quick question though. The low and high speed carburetor adjust knobs keep moving to the left as the engine vibrates. Eventually, the engine runs rich and bogs down. Is there a nut I missed that tightens these things down? I should I just tape them in place and move on?

Thanks,

Steve.

[2fast4me]

Packing inside the carb adds friction to the needles just tighten the brass till you get the right tension.

2Fast4Me

[wedgie]

Snug the packing nut up with a 7/16 wrench after getting the needles adjusted, but not too tight as you may need to fine tune them .

[david-bartlett]

Yes, just snug up the packing nuts.

[fisherman6]

Steve,
There should be a brass ‘sleeve’ that the adjustment needles fit inside with a hex head on them. Those are the packing nuts and they are there to compress the packing washers into a tapered seat in the carb body around the threaded portion of the needles. Those should be snug enough to prevent vibration from moving the needles out of adjustment at a very minimum. Once the adjustments are close to dialed in, I always snug them up so the knobs do not turn so easily that the adjustments can be easily moved accidentally. I make the final adjustment after they are pretty snug.

Whenever I rebuild a carb I remove the old packing and clean the pocket out well making sure to get out all the old crumbles of packing. I then replace the packing washers with new ones. The packing prevents unwanted movement of the adjustments as well as air leaking past the needles and leaning out the mixture.

I hope this helps.

-Ben

OldJohnnyRude on YouTube

[steveh]

Thanks again guys. I did not rebuild the carburetor, so I’ll snug those down and see what happens. I appreciate it!

[crosbyman]

http://boatinfo.no/lib/johnson/manuals/ … hnson.html

covers everything on your CD and most oldies

Joining AOMCI has priviledges 🙂

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