carb question….

[amuller]

This seems like sort of a dumb question, but anyway:

Rechecking the carb on my 1962 5.5 Johnson–it has a high speed needle. With the center nozzle installed, the carb body and the float bowl won’t come together by about 1/16". This is just about the thickness of the bowl gasket in the kit but there won’t be much compression on it. Seems the threads on the nozzle would have to enter the center passage of the float bowl for things to come together, and they don’t want to. I wondered if the wrong nozzle could be present but it looks exactly like the image on marineengine.com.

Is this the way this is supposed to be? Am I missing something obvious?

Thanks.

[seakaye12]

When you have installed a brand new cork type boss gasket (the round one on the nozzle…) it does take some screwing down to compress that. Just be careful to tighten the screws in rotation a little at a time.

[Mumbles]

Are you using the OMC/BRP 439071 carb kit? If so, it will include a thick seal for the nozzle and the bowl will stand off about a sixteenth of an inch until the screws are snugged down.

Perfectly normal!

[amuller]

Yes on the kit. It stands off even without the seal installed. I’m thinking the last few threads on the nozzle need to lose their peaks.

It is a light brown plastic seal.

By the way, what’s the purpose of the rubber donut in that kit? I know it fits various carbs.

[Mumbles]

Uh oh. Sounds like the threads on the nozzle might need chasing.

That donut has me stumped to. Never could figure it out.

[amuller]

OK, so I filed the first 1/8 in of threads a little and things went together. Try it out tomorrow.
Also did the carb of our old Lawnboy mower, also a Gale product. The floats are supposed to be the same but actually aren’t, as the Lawnboy carb has an intrusion that needs a relief cut into the float opposite the arm.

So I played around with floating several floats in gasoline. Most buoyant was the new plastic foam float. Second the cork one I dipped in POR15 a few weeks ago. The cork Lawnboy float didn’t seem to have lost it’s coating, but another cork float from a motor that sat with its carb full of water barely floated. Hard to say what these differences would mean operationally.

Anybody remember the carbs on Datsun 510s? Hitachis, I think. Big glass window on the side of the float bowl ….could really see what was going on in there.

[crosbyman]

datsun 510 station wagon….$1599 brand new as I recall… great car !

Joining AOMCI has priviledges 🙂

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